Bump version to 0.8.0 and update changelog

* chore: upgrade deps, update changelog, drop test db before create

* tests: clear operators for sqlite ddl after NotSupportError raised

.github/workflows/ci.yml

@@ -18,13 +18,22 @@ jobs:
           POSTGRES_PASSWORD: 123456
           POSTGRES_USER: postgres
         options: --health-cmd=pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
     steps:
       - name: Start MySQL
         run: sudo systemctl start mysql.service
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/cache@v4
         with:
-          python-version: '3.x'
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/poetry.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
       - name: Install and configure Poetry
         run: |
           pip install -U pip poetry

.github/workflows/pypi.yml

@@ -7,8 +7,8 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: '3.x'
       - name: Install and configure Poetry

CHANGELOG.md

@@ -1,8 +1,21 @@
 # ChangeLog
 
+## 0.8
+
+### [0.8.0](../../releases/tag/v0.8.0) - 2024-12-04
+
+- Fix the issue of parameter concatenation when generating ORM with inspectdb (#331)
+- Fix KeyError when deleting a field with unqiue=True. (#364)
+- Correct the click import. (#360)
+- Improve CLI help text and output. (#355)
+- Fix mysql drop unique index raises OperationalError. (#346)
+  **Upgrade note:**
+    1. Use column name as unique key name for mysql
+    2. Drop support for Python3.7
+
 ## 0.7
 
-### 0.7.2
+### [0.7.2](../../releases/tag/v0.7.2) - 2023-07-20
 
 - Support virtual fields.
 - Fix modify multiple times. (#279)

Makefile

@@ -14,13 +14,20 @@ up:
 deps:
 	@poetry install -E asyncpg -E asyncmy
 
-style: deps
+_style:
 	@isort -src $(checkfiles)
 	@black $(black_opts) $(checkfiles)
+style: deps _style
 
-check: deps
+_check:
 	@black --check $(black_opts) $(checkfiles) || (echo "Please run 'make style' to auto-fix style issues" && false)
-	@ruff $(checkfiles)
+	@ruff check $(checkfiles)
+	@mypy $(checkfiles)
+ifneq ($(shell python -c 'import sys;is_py38=sys.version_info<(3,9);rc=int(is_py38);sys.exit(rc)'),)
+	# Run bandit with Python3.9+, as the `usedforsecurity=...` parameter of `hashlib.new` is only added from Python 3.9 onwards.
+	@bandit -r aerich
+endif
+check: deps _check
 
 test: deps
 	$(py_warn) TEST_DB=sqlite://:memory: py.test
@@ -34,9 +41,10 @@ test_mysql:
 test_postgres:
 	$(py_warn) TEST_DB="postgres://postgres:$(POSTGRES_PASS)@$(POSTGRES_HOST):$(POSTGRES_PORT)/test_\{\}" pytest -vv -s
 
-testall: deps test_sqlite test_postgres test_mysql
+_testall: test_sqlite test_postgres test_mysql
+testall: deps _testall
 
 build: deps
 	@poetry build
 
-ci: check testall
+ci: check _testall

README.md

@@ -46,7 +46,7 @@ Commands:
 
 ## Usage
 
-You need add `aerich.models` to your `Tortoise-ORM` config first. Example:
+You need to add `aerich.models` to your `Tortoise-ORM` config first. Example:
 
 ```python
 TORTOISE_ORM = {
@@ -113,6 +113,14 @@ If `aerich` guesses you are renaming a column, it will ask `Rename {old_column}
 `True` to rename column without column drop, or choose `False` to drop the column then create. Note that the latter may
 lose data.
 
+If you need to manually write migration, you could generate empty file:
+
+```shell
+> aerich migrate --name add_index --empty
+
+Success migrate 1_202326122220101229_add_index.py
+```
+
 ### Upgrade to latest version
 
 ```shell

aerich/__init__.py

@@ -1,6 +1,6 @@
 import os
 from pathlib import Path
-from typing import List
+from typing import TYPE_CHECKING, List, Optional, Type
 
 from tortoise import Tortoise, generate_schema_for_client
 from tortoise.exceptions import OperationalError
@@ -20,6 +20,9 @@ from aerich.utils import (
     import_py_file,
 )
 
+if TYPE_CHECKING:
+    from aerich.inspectdb import Inspect  # noqa:F401
+
 
 class Command:
     def __init__(
@@ -27,16 +30,16 @@ class Command:
         tortoise_config: dict,
         app: str = "models",
         location: str = "./migrations",
-    ):
+    ) -> None:
         self.tortoise_config = tortoise_config
         self.app = app
         self.location = location
         Migrate.app = app
 
-    async def init(self):
+    async def init(self) -> None:
         await Migrate.init(self.tortoise_config, self.app, self.location)
 
-    async def _upgrade(self, conn, version_file):
+    async def _upgrade(self, conn, version_file) -> None:
         file_path = Path(Migrate.migrate_location, version_file)
         m = import_py_file(file_path)
         upgrade = getattr(m, "upgrade")
@@ -47,7 +50,7 @@ class Command:
             content=get_models_describe(self.app),
         )
 
-    async def upgrade(self, run_in_transaction: bool):
+    async def upgrade(self, run_in_transaction: bool = True) -> List[str]:
         migrated = []
         for version_file in Migrate.get_all_version_files():
             try:
@@ -65,8 +68,8 @@ class Command:
                 migrated.append(version_file)
         return migrated
 
-    async def downgrade(self, version: int, delete: bool):
-        ret = []
+    async def downgrade(self, version: int, delete: bool) -> List[str]:
+        ret: List[str] = []
         if version == -1:
             specified_version = await Migrate.get_last_version()
         else:
@@ -79,8 +82,8 @@ class Command:
             versions = [specified_version]
         else:
             versions = await Aerich.filter(app=self.app, pk__gte=specified_version.pk)
-        for version in versions:
-            file = version.version
+        for version_obj in versions:
+            file = version_obj.version
             async with in_transaction(
                 get_app_connection_name(self.tortoise_config, self.app)
             ) as conn:
@@ -91,13 +94,13 @@ class Command:
                 if not downgrade_sql.strip():
                     raise DowngradeError("No downgrade items found")
                 await conn.execute_script(downgrade_sql)
-                await version.delete()
+                await version_obj.delete()
                 if delete:
                     os.unlink(file_path)
                 ret.append(file)
         return ret
 
-    async def heads(self):
+    async def heads(self) -> List[str]:
         ret = []
         versions = Migrate.get_all_version_files()
         for version in versions:
@@ -105,15 +108,15 @@ class Command:
                 ret.append(version)
         return ret
 
-    async def history(self):
+    async def history(self) -> List[str]:
         versions = Migrate.get_all_version_files()
         return [version for version in versions]
 
-    async def inspectdb(self, tables: List[str] = None) -> str:
+    async def inspectdb(self, tables: Optional[List[str]] = None) -> str:
         connection = get_app_connection(self.tortoise_config, self.app)
         dialect = connection.schema_generator.DIALECT
         if dialect == "mysql":
-            cls = InspectMySQL
+            cls: Type["Inspect"] = InspectMySQL
         elif dialect == "postgres":
             cls = InspectPostgres
         elif dialect == "sqlite":
@@ -123,10 +126,10 @@ class Command:
         inspect = cls(connection, tables)
         return await inspect.inspect()
 
-    async def migrate(self, name: str = "update"):
-        return await Migrate.migrate(name)
+    async def migrate(self, name: str = "update", empty: bool = False) -> str:
+        return await Migrate.migrate(name, empty)
 
-    async def init_db(self, safe: bool):
+    async def init_db(self, safe: bool) -> None:
         location = self.location
         app = self.app
         dirname = Path(location, app)

aerich/cli.py

@@ -1,14 +1,11 @@
-import asyncio
 import os
-from functools import wraps
 from pathlib import Path
-from typing import List
+from typing import Dict, List, cast
 
-import click
+import asyncclick as click
 import tomlkit
-from click import Context, UsageError
+from asyncclick import Context, UsageError
 from tomlkit.exceptions import NonExistentKey
-from tortoise import Tortoise
 
 from aerich import Command
 from aerich.enums import Color
@@ -21,21 +18,6 @@ CONFIG_DEFAULT_VALUES = {
 }
 
 
-def coro(f):
-    @wraps(f)
-    def wrapper(*args, **kwargs):
-        loop = asyncio.get_event_loop()
-
-        # Close db connections at the end of all but the cli group function
-        try:
-            loop.run_until_complete(f(*args, **kwargs))
-        finally:
-            if f.__name__ not in ["cli", "init"]:
-                loop.run_until_complete(Tortoise.close_connections())
-
-    return wrapper
-
-
 @click.group(context_settings={"help_option_names": ["-h", "--help"]})
 @click.version_option(__version__, "-V", "--version")
 @click.option(
@@ -47,8 +29,7 @@ def coro(f):
 )
 @click.option("--app", required=False, help="Tortoise-ORM app name.")
 @click.pass_context
-@coro
-async def cli(ctx: Context, config, app):
+async def cli(ctx: Context, config, app) -> None:
     ctx.ensure_object(dict)
     ctx.obj["config_file"] = config
 
@@ -56,57 +37,62 @@ async def cli(ctx: Context, config, app):
     if invoked_subcommand != "init":
         config_path = Path(config)
         if not config_path.exists():
-            raise UsageError("You must exec init first", ctx=ctx)
+            raise UsageError(
+                "You need to run `aerich init` first to create the config file.", ctx=ctx
+            )
         content = config_path.read_text()
-        doc = tomlkit.parse(content)
+        doc: dict = tomlkit.parse(content)
         try:
-            tool = doc["tool"]["aerich"]
+            tool = cast(Dict[str, str], doc["tool"]["aerich"])
             location = tool["location"]
             tortoise_orm = tool["tortoise_orm"]
             src_folder = tool.get("src_folder", CONFIG_DEFAULT_VALUES["src_folder"])
         except NonExistentKey:
-            raise UsageError("You need run aerich init again when upgrade to 0.6.0+")
+            raise UsageError("You need run `aerich init` again when upgrading to aerich 0.6.0+.")
         add_src_path(src_folder)
         tortoise_config = get_tortoise_config(ctx, tortoise_orm)
-        app = app or list(tortoise_config.get("apps").keys())[0]
+        if not app:
+            apps_config = cast(dict, tortoise_config.get("apps"))
+            app = list(apps_config.keys())[0]
         command = Command(tortoise_config=tortoise_config, app=app, location=location)
         ctx.obj["command"] = command
         if invoked_subcommand != "init-db":
             if not Path(location, app).exists():
-                raise UsageError("You must exec init-db first", ctx=ctx)
+                raise UsageError(
+                    "You need to run `aerich init-db` first to initialize the database.", ctx=ctx
+                )
             await command.init()
 
 
-@cli.command(help="Generate migrate changes file.")
-@click.option("--name", default="update", show_default=True, help="Migrate name.")
+@cli.command(help="Generate a migration file for the current state of the models.")
+@click.option("--name", default="update", show_default=True, help="Migration name.")
+@click.option("--empty", default=False, is_flag=True, help="Generate an empty migration file.")
 @click.pass_context
-@coro
-async def migrate(ctx: Context, name):
+async def migrate(ctx: Context, name, empty) -> None:
     command = ctx.obj["command"]
-    ret = await command.migrate(name)
+    ret = await command.migrate(name, empty)
     if not ret:
         return click.secho("No changes detected", fg=Color.yellow)
-    click.secho(f"Success migrate {ret}", fg=Color.green)
+    click.secho(f"Success creating migration file {ret}", fg=Color.green)
 
 
-@cli.command(help="Upgrade to specified version.")
+@cli.command(help="Upgrade to specified migration version.")
 @click.option(
     "--in-transaction",
     "-i",
     default=True,
     type=bool,
-    help="Make migrations in transaction or not. Can be helpful for large migrations or creating concurrent indexes.",
+    help="Make migrations in a single transaction or not. Can be helpful for large migrations or creating concurrent indexes.",
 )
 @click.pass_context
-@coro
-async def upgrade(ctx: Context, in_transaction: bool):
+async def upgrade(ctx: Context, in_transaction: bool) -> None:
     command = ctx.obj["command"]
     migrated = await command.upgrade(run_in_transaction=in_transaction)
     if not migrated:
         click.secho("No upgrade items found", fg=Color.yellow)
     else:
         for version_file in migrated:
-            click.secho(f"Success upgrade {version_file}", fg=Color.green)
+            click.secho(f"Success upgrading to {version_file}", fg=Color.green)
 
 
 @cli.command(help="Downgrade to specified version.")
@@ -115,8 +101,8 @@ async def upgrade(ctx: Context, in_transaction: bool):
     "--version",
     default=-1,
     type=int,
-    show_default=True,
-    help="Specified version, default to last.",
+    show_default=False,
+    help="Specified version, default to last migration.",
 )
 @click.option(
     "-d",
@@ -124,59 +110,56 @@ async def upgrade(ctx: Context, in_transaction: bool):
     is_flag=True,
     default=False,
     show_default=True,
-    help="Delete version files at the same time.",
+    help="Also delete the migration files.",
 )
 @click.pass_context
 @click.confirmation_option(
-    prompt="Downgrade is dangerous, which maybe lose your data, are you sure?",
+    prompt="Downgrade is dangerous: you might lose your data! Are you sure?",
 )
-@coro
-async def downgrade(ctx: Context, version: int, delete: bool):
+async def downgrade(ctx: Context, version: int, delete: bool) -> None:
     command = ctx.obj["command"]
     try:
         files = await command.downgrade(version, delete)
     except DowngradeError as e:
         return click.secho(str(e), fg=Color.yellow)
     for file in files:
-        click.secho(f"Success downgrade {file}", fg=Color.green)
+        click.secho(f"Success downgrading to {file}", fg=Color.green)
 
 
-@cli.command(help="Show current available heads in migrate location.")
+@cli.command(help="Show currently available heads (unapplied migrations).")
 @click.pass_context
-@coro
-async def heads(ctx: Context):
+async def heads(ctx: Context) -> None:
     command = ctx.obj["command"]
     head_list = await command.heads()
     if not head_list:
-        return click.secho("No available heads, try migrate first", fg=Color.green)
+        return click.secho("No available heads.", fg=Color.green)
     for version in head_list:
         click.secho(version, fg=Color.green)
 
 
-@cli.command(help="List all migrate items.")
+@cli.command(help="List all migrations.")
 @click.pass_context
-@coro
-async def history(ctx: Context):
+async def history(ctx: Context) -> None:
     command = ctx.obj["command"]
     versions = await command.history()
     if not versions:
-        return click.secho("No history, try migrate", fg=Color.green)
+        return click.secho("No migrations created yet.", fg=Color.green)
     for version in versions:
         click.secho(version, fg=Color.green)
 
 
-@cli.command(help="Init config file and generate root migrate location.")
+@cli.command(help="Initialize aerich config and create migrations folder.")
 @click.option(
     "-t",
     "--tortoise-orm",
     required=True,
-    help="Tortoise-ORM config module dict variable, like settings.TORTOISE_ORM.",
+    help="Tortoise-ORM config dict location, like `settings.TORTOISE_ORM`.",
 )
 @click.option(
     "--location",
     default="./migrations",
     show_default=True,
-    help="Migrate store location.",
+    help="Migrations folder.",
 )
 @click.option(
     "-s",
@@ -186,8 +169,7 @@ async def history(ctx: Context):
     help="Folder of the source, relative to the project root.",
 )
 @click.pass_context
-@coro
-async def init(ctx: Context, tortoise_orm, location, src_folder):
+async def init(ctx: Context, tortoise_orm, location, src_folder) -> None:
     config_file = ctx.obj["config_file"]
 
     if os.path.isabs(src_folder):
@@ -202,9 +184,9 @@ async def init(ctx: Context, tortoise_orm, location, src_folder):
     config_path = Path(config_file)
     if config_path.exists():
         content = config_path.read_text()
-        doc = tomlkit.parse(content)
     else:
-        doc = tomlkit.parse("[tool.aerich]")
+        content = "[tool.aerich]"
+    doc: dict = tomlkit.parse(content)
     table = tomlkit.table()
     table["tortoise_orm"] = tortoise_orm
     table["location"] = location
@@ -215,37 +197,36 @@ async def init(ctx: Context, tortoise_orm, location, src_folder):
 
     Path(location).mkdir(parents=True, exist_ok=True)
 
-    click.secho(f"Success create migrate location {location}", fg=Color.green)
-    click.secho(f"Success write config to {config_file}", fg=Color.green)
+    click.secho(f"Success creating migrations folder {location}", fg=Color.green)
+    click.secho(f"Success writing aerich config to {config_file}", fg=Color.green)
 
 
-@cli.command(help="Generate schema and generate app migrate location.")
+@cli.command(help="Generate schema and generate app migration folder.")
 @click.option(
     "-s",
     "--safe",
     type=bool,
     is_flag=True,
     default=True,
-    help="When set to true, creates the table only when it does not already exist.",
+    help="Create tables only when they do not already exist.",
     show_default=True,
 )
 @click.pass_context
-@coro
-async def init_db(ctx: Context, safe: bool):
+async def init_db(ctx: Context, safe: bool) -> None:
     command = ctx.obj["command"]
     app = command.app
     dirname = Path(command.location, app)
     try:
         await command.init_db(safe)
-        click.secho(f"Success create app migrate location {dirname}", fg=Color.green)
-        click.secho(f'Success generate schema for app "{app}"', fg=Color.green)
+        click.secho(f"Success creating app migration folder {dirname}", fg=Color.green)
+        click.secho(f'Success generating initial migration file for app "{app}"', fg=Color.green)
     except FileExistsError:
         return click.secho(
-            f"Inited {app} already, or delete {dirname} and try again.", fg=Color.yellow
+            f"App {app} is already initialized. Delete {dirname} and try again.", fg=Color.yellow
         )
 
 
-@cli.command(help="Introspects the database tables to standard output as TortoiseORM model.")
+@cli.command(help="Prints the current database tables to stdout as Tortoise-ORM models.")
 @click.option(
     "-t",
     "--table",
@@ -254,14 +235,13 @@ async def init_db(ctx: Context, safe: bool):
     required=False,
 )
 @click.pass_context
-@coro
-async def inspectdb(ctx: Context, table: List[str]):
+async def inspectdb(ctx: Context, table: List[str]) -> None:
     command = ctx.obj["command"]
     ret = await command.inspectdb(table)
     click.secho(ret)
 
 
-def main():
+def main() -> None:
     cli()
 
 

aerich/coder.py

@@ -1,12 +1,13 @@
 import base64
 import json
 import pickle  # nosec: B301,B403
+from typing import Any, Union
 
 from tortoise.indexes import Index
 
 
 class JsonEncoder(json.JSONEncoder):
-    def default(self, obj):
+    def default(self, obj) -> Any:
         if isinstance(obj, Index):
             return {
                 "type": "index",
@@ -16,16 +17,16 @@ class JsonEncoder(json.JSONEncoder):
             return super().default(obj)
 
 
-def object_hook(obj):
+def object_hook(obj) -> Any:
     _type = obj.get("type")
     if not _type:
         return obj
     return pickle.loads(base64.b64decode(obj["val"]))  # nosec: B301
 
 
-def encoder(obj: dict):
+def encoder(obj: dict) -> str:
     return json.dumps(obj, cls=JsonEncoder)
 
 
-def decoder(obj: str):
+def decoder(obj: Union[str, bytes]) -> Any:
     return json.loads(obj, object_hook=object_hook)

aerich/ddl/__init__.py

@@ -1,5 +1,5 @@
 from enum import Enum
-from typing import List, Type
+from typing import Any, List, Type, cast
 
 from tortoise import BaseDBAsyncClient, Model
 from tortoise.backends.base.schema_generator import BaseSchemaGenerator
@@ -35,25 +35,26 @@ class BaseDDL:
     )
     _RENAME_TABLE_TEMPLATE = 'ALTER TABLE "{old_table_name}" RENAME TO "{new_table_name}"'
 
-    def __init__(self, client: "BaseDBAsyncClient"):
+    def __init__(self, client: "BaseDBAsyncClient") -> None:
         self.client = client
         self.schema_generator = self.schema_generator_cls(client)
 
-    def create_table(self, model: "Type[Model]"):
+    def create_table(self, model: "Type[Model]") -> str:
         return self.schema_generator._get_table_sql(model, True)["table_creation_string"].rstrip(
             ";"
         )
 
-    def drop_table(self, table_name: str):
+    def drop_table(self, table_name: str) -> str:
         return self._DROP_TABLE_TEMPLATE.format(table_name=table_name)
 
     def create_m2m(
         self, model: "Type[Model]", field_describe: dict, reference_table_describe: dict
-    ):
-        through = field_describe.get("through")
+    ) -> str:
+        through = cast(str, field_describe.get("through"))
         description = field_describe.get("description")
-        reference_id = reference_table_describe.get("pk_field").get("db_column")
-        db_field_types = reference_table_describe.get("pk_field").get("db_field_types")
+        pk_field = cast(dict, reference_table_describe.get("pk_field"))
+        reference_id = pk_field.get("db_column")
+        db_field_types = cast(dict, pk_field.get("db_field_types"))
         return self._M2M_TABLE_TEMPLATE.format(
             table_name=through,
             backward_table=model._meta.db_table,
@@ -66,22 +67,22 @@ class BaseDDL:
             forward_type=db_field_types.get(self.DIALECT) or db_field_types.get(""),
             on_delete=field_describe.get("on_delete"),
             extra=self.schema_generator._table_generate_extra(table=through),
-            comment=self.schema_generator._table_comment_generator(
-                table=through, comment=description
-            )
-            if description
-            else "",
+            comment=(
+                self.schema_generator._table_comment_generator(table=through, comment=description)
+                if description
+                else ""
+            ),
         )
 
-    def drop_m2m(self, table_name: str):
+    def drop_m2m(self, table_name: str) -> str:
         return self._DROP_TABLE_TEMPLATE.format(table_name=table_name)
 
-    def _get_default(self, model: "Type[Model]", field_describe: dict):
+    def _get_default(self, model: "Type[Model]", field_describe: dict) -> Any:
         db_table = model._meta.db_table
         default = field_describe.get("default")
         if isinstance(default, Enum):
             default = default.value
-        db_column = field_describe.get("db_column")
+        db_column = cast(str, field_describe.get("db_column"))
         auto_now_add = field_describe.get("auto_now_add", False)
         auto_now = field_describe.get("auto_now", False)
         if default is not None or auto_now_add:
@@ -106,64 +107,55 @@ class BaseDDL:
             default = None
         return default
 
-    def add_column(self, model: "Type[Model]", field_describe: dict, is_pk: bool = False):
+    def add_column(self, model: "Type[Model]", field_describe: dict, is_pk: bool = False) -> str:
+        return self._add_or_modify_column(model, field_describe, is_pk)
+
+    def _add_or_modify_column(self, model, field_describe: dict, is_pk: bool, modify=False) -> str:
         db_table = model._meta.db_table
         description = field_describe.get("description")
-        db_column = field_describe.get("db_column")
-        db_field_types = field_describe.get("db_field_types")
+        db_column = cast(str, field_describe.get("db_column"))
+        db_field_types = cast(dict, field_describe.get("db_field_types"))
         default = self._get_default(model, field_describe)
         if default is None:
             default = ""
-        return self._ADD_COLUMN_TEMPLATE.format(
+        if modify:
+            unique = ""
+            template = self._MODIFY_COLUMN_TEMPLATE
+        else:
+            unique = "UNIQUE" if field_describe.get("unique") else ""
+            template = self._ADD_COLUMN_TEMPLATE
+        return template.format(
             table_name=db_table,
             column=self.schema_generator._create_string(
                 db_column=db_column,
                 field_type=db_field_types.get(self.DIALECT, db_field_types.get("")),
                 nullable="NOT NULL" if not field_describe.get("nullable") else "",
-                unique="UNIQUE" if field_describe.get("unique") else "",
-                comment=self.schema_generator._column_comment_generator(
-                    table=db_table,
-                    column=db_column,
-                    comment=field_describe.get("description"),
-                )
-                if description
-                else "",
+                unique=unique,
+                comment=(
+                    self.schema_generator._column_comment_generator(
+                        table=db_table,
+                        column=db_column,
+                        comment=description,
+                    )
+                    if description
+                    else ""
+                ),
                 is_primary_key=is_pk,
                 default=default,
             ),
         )
 
-    def drop_column(self, model: "Type[Model]", column_name: str):
+    def drop_column(self, model: "Type[Model]", column_name: str) -> str:
         return self._DROP_COLUMN_TEMPLATE.format(
             table_name=model._meta.db_table, column_name=column_name
         )
 
-    def modify_column(self, model: "Type[Model]", field_describe: dict, is_pk: bool = False):
-        db_table = model._meta.db_table
-        db_field_types = field_describe.get("db_field_types")
-        default = self._get_default(model, field_describe)
-        if default is None:
-            default = ""
-        return self._MODIFY_COLUMN_TEMPLATE.format(
-            table_name=db_table,
-            column=self.schema_generator._create_string(
-                db_column=field_describe.get("db_column"),
-                field_type=db_field_types.get(self.DIALECT) or db_field_types.get(""),
-                nullable="NOT NULL" if not field_describe.get("nullable") else "",
-                unique="",
-                comment=self.schema_generator._column_comment_generator(
-                    table=db_table,
-                    column=field_describe.get("db_column"),
-                    comment=field_describe.get("description"),
-                )
-                if field_describe.get("description")
-                else "",
-                is_primary_key=is_pk,
-                default=default,
-            ),
-        )
+    def modify_column(self, model: "Type[Model]", field_describe: dict, is_pk: bool = False) -> str:
+        return self._add_or_modify_column(model, field_describe, is_pk, modify=True)
 
-    def rename_column(self, model: "Type[Model]", old_column_name: str, new_column_name: str):
+    def rename_column(
+        self, model: "Type[Model]", old_column_name: str, new_column_name: str
+    ) -> str:
         return self._RENAME_COLUMN_TEMPLATE.format(
             table_name=model._meta.db_table,
             old_column_name=old_column_name,
@@ -172,7 +164,7 @@ class BaseDDL:
 
     def change_column(
         self, model: "Type[Model]", old_column_name: str, new_column_name: str, new_column_type: str
-    ):
+    ) -> str:
         return self._CHANGE_COLUMN_TEMPLATE.format(
             table_name=model._meta.db_table,
             old_column_name=old_column_name,
@@ -180,7 +172,7 @@ class BaseDDL:
             new_column_type=new_column_type,
         )
 
-    def add_index(self, model: "Type[Model]", field_names: List[str], unique=False):
+    def add_index(self, model: "Type[Model]", field_names: List[str], unique=False) -> str:
         return self._ADD_INDEX_TEMPLATE.format(
             unique="UNIQUE " if unique else "",
             index_name=self.schema_generator._generate_index_name(
@@ -190,7 +182,7 @@ class BaseDDL:
             column_names=", ".join(self.schema_generator.quote(f) for f in field_names),
         )
 
-    def drop_index(self, model: "Type[Model]", field_names: List[str], unique=False):
+    def drop_index(self, model: "Type[Model]", field_names: List[str], unique=False) -> str:
         return self._DROP_INDEX_TEMPLATE.format(
             index_name=self.schema_generator._generate_index_name(
                 "idx" if not unique else "uid", model, field_names
@@ -198,45 +190,52 @@ class BaseDDL:
             table_name=model._meta.db_table,
         )
 
-    def drop_index_by_name(self, model: "Type[Model]", index_name: str):
+    def drop_index_by_name(self, model: "Type[Model]", index_name: str) -> str:
         return self._DROP_INDEX_TEMPLATE.format(
             index_name=index_name,
             table_name=model._meta.db_table,
         )
 
-    def add_fk(self, model: "Type[Model]", field_describe: dict, reference_table_describe: dict):
+    def _generate_fk_name(
+        self, db_table, field_describe: dict, reference_table_describe: dict
+    ) -> str:
+        """Generate fk name"""
+        db_column = cast(str, field_describe.get("raw_field"))
+        pk_field = cast(dict, reference_table_describe.get("pk_field"))
+        to_field = cast(str, pk_field.get("db_column"))
+        to_table = cast(str, reference_table_describe.get("table"))
+        return self.schema_generator._generate_fk_name(
+            from_table=db_table,
+            from_field=db_column,
+            to_table=to_table,
+            to_field=to_field,
+        )
+
+    def add_fk(
+        self, model: "Type[Model]", field_describe: dict, reference_table_describe: dict
+    ) -> str:
         db_table = model._meta.db_table
 
         db_column = field_describe.get("raw_field")
-        reference_id = reference_table_describe.get("pk_field").get("db_column")
-        fk_name = self.schema_generator._generate_fk_name(
-            from_table=db_table,
-            from_field=db_column,
-            to_table=reference_table_describe.get("table"),
-            to_field=reference_table_describe.get("pk_field").get("db_column"),
-        )
+        pk_field = cast(dict, reference_table_describe.get("pk_field"))
+        reference_id = pk_field.get("db_column")
         return self._ADD_FK_TEMPLATE.format(
             table_name=db_table,
-            fk_name=fk_name,
+            fk_name=self._generate_fk_name(db_table, field_describe, reference_table_describe),
             db_column=db_column,
             table=reference_table_describe.get("table"),
             field=reference_id,
             on_delete=field_describe.get("on_delete"),
         )
 
-    def drop_fk(self, model: "Type[Model]", field_describe: dict, reference_table_describe: dict):
+    def drop_fk(
+        self, model: "Type[Model]", field_describe: dict, reference_table_describe: dict
+    ) -> str:
         db_table = model._meta.db_table
-        return self._DROP_FK_TEMPLATE.format(
-            table_name=db_table,
-            fk_name=self.schema_generator._generate_fk_name(
-                from_table=db_table,
-                from_field=field_describe.get("raw_field"),
-                to_table=reference_table_describe.get("table"),
-                to_field=reference_table_describe.get("pk_field").get("db_column"),
-            ),
-        )
+        fk_name = self._generate_fk_name(db_table, field_describe, reference_table_describe)
+        return self._DROP_FK_TEMPLATE.format(table_name=db_table, fk_name=fk_name)
 
-    def alter_column_default(self, model: "Type[Model]", field_describe: dict):
+    def alter_column_default(self, model: "Type[Model]", field_describe: dict) -> str:
         db_table = model._meta.db_table
         default = self._get_default(model, field_describe)
         return self._ALTER_DEFAULT_TEMPLATE.format(
@@ -245,13 +244,13 @@ class BaseDDL:
             default="SET" + default if default is not None else "DROP DEFAULT",
         )
 
-    def alter_column_null(self, model: "Type[Model]", field_describe: dict):
+    def alter_column_null(self, model: "Type[Model]", field_describe: dict) -> str:
         return self.modify_column(model, field_describe)
 
-    def set_comment(self, model: "Type[Model]", field_describe: dict):
+    def set_comment(self, model: "Type[Model]", field_describe: dict) -> str:
         return self.modify_column(model, field_describe)
 
-    def rename_table(self, model: "Type[Model]", old_table_name: str, new_table_name: str):
+    def rename_table(self, model: "Type[Model]", old_table_name: str, new_table_name: str) -> str:
         db_table = model._meta.db_table
         return self._RENAME_TABLE_TEMPLATE.format(
             table_name=db_table, old_table_name=old_table_name, new_table_name=new_table_name

aerich/ddl/mysql/__init__.py

@@ -1,7 +1,12 @@
+from typing import TYPE_CHECKING, List, Type
+
 from tortoise.backends.mysql.schema_generator import MySQLSchemaGenerator
 
 from aerich.ddl import BaseDDL
 
+if TYPE_CHECKING:
+    from tortoise import Model  # noqa:F401
+
 
 class MysqlDDL(BaseDDL):
     schema_generator_cls = MySQLSchemaGenerator
@@ -30,3 +35,29 @@ class MysqlDDL(BaseDDL):
     )
     _MODIFY_COLUMN_TEMPLATE = "ALTER TABLE `{table_name}` MODIFY COLUMN {column}"
     _RENAME_TABLE_TEMPLATE = "ALTER TABLE `{old_table_name}` RENAME TO `{new_table_name}`"
+
+    def _index_name(self, unique: bool, model: "Type[Model]", field_names: List[str]) -> str:
+        if unique:
+            if len(field_names) == 1:
+                # Example: `email = CharField(max_length=50, unique=True)`
+                # Generate schema: `"email" VARCHAR(10) NOT NULL UNIQUE`
+                # Unique index key is the same as field name: `email`
+                return field_names[0]
+            index_prefix = "uid"
+        else:
+            index_prefix = "idx"
+        return self.schema_generator._generate_index_name(index_prefix, model, field_names)
+
+    def add_index(self, model: "Type[Model]", field_names: List[str], unique=False) -> str:
+        return self._ADD_INDEX_TEMPLATE.format(
+            unique="UNIQUE " if unique else "",
+            index_name=self._index_name(unique, model, field_names),
+            table_name=model._meta.db_table,
+            column_names=", ".join(self.schema_generator.quote(f) for f in field_names),
+        )
+
+    def drop_index(self, model: "Type[Model]", field_names: List[str], unique=False) -> str:
+        return self._DROP_INDEX_TEMPLATE.format(
+            index_name=self._index_name(unique, model, field_names),
+            table_name=model._meta.db_table,
+        )

aerich/ddl/postgres/__init__.py

@@ -1,4 +1,4 @@
-from typing import Type
+from typing import Type, cast
 
 from tortoise import Model
 from tortoise.backends.asyncpg.schema_generator import AsyncpgSchemaGenerator
@@ -18,7 +18,7 @@ class PostgresDDL(BaseDDL):
     _SET_COMMENT_TEMPLATE = 'COMMENT ON COLUMN "{table_name}"."{column}" IS {comment}'
     _DROP_FK_TEMPLATE = 'ALTER TABLE "{table_name}" DROP CONSTRAINT "{fk_name}"'
 
-    def alter_column_null(self, model: "Type[Model]", field_describe: dict):
+    def alter_column_null(self, model: "Type[Model]", field_describe: dict) -> str:
         db_table = model._meta.db_table
         return self._ALTER_NULL_TEMPLATE.format(
             table_name=db_table,
@@ -26,9 +26,9 @@ class PostgresDDL(BaseDDL):
             set_drop="DROP" if field_describe.get("nullable") else "SET",
         )
 
-    def modify_column(self, model: "Type[Model]", field_describe: dict, is_pk: bool = False):
+    def modify_column(self, model: "Type[Model]", field_describe: dict, is_pk: bool = False) -> str:
         db_table = model._meta.db_table
-        db_field_types = field_describe.get("db_field_types")
+        db_field_types = cast(dict, field_describe.get("db_field_types"))
         db_column = field_describe.get("db_column")
         datatype = db_field_types.get(self.DIALECT) or db_field_types.get("")
         return self._MODIFY_COLUMN_TEMPLATE.format(
@@ -38,12 +38,14 @@ class PostgresDDL(BaseDDL):
             using=f' USING "{db_column}"::{datatype}',
         )
 
-    def set_comment(self, model: "Type[Model]", field_describe: dict):
+    def set_comment(self, model: "Type[Model]", field_describe: dict) -> str:
         db_table = model._meta.db_table
         return self._SET_COMMENT_TEMPLATE.format(
             table_name=db_table,
             column=field_describe.get("db_column") or field_describe.get("raw_field"),
-            comment="'{}'".format(field_describe.get("description"))
-            if field_describe.get("description")
-            else "NULL",
+            comment=(
+                "'{}'".format(field_describe.get("description"))
+                if field_describe.get("description")
+                else "NULL"
+            ),
         )

aerich/inspectdb/__init__.py

@@ -1,24 +1,39 @@
-from typing import Any, List, Optional
+from __future__ import annotations
+
+from typing import Any, Callable, Dict, Optional, TypedDict
 
 from pydantic import BaseModel
 from tortoise import BaseDBAsyncClient
 
 
+class ColumnInfoDict(TypedDict):
+    name: str
+    pk: str
+    index: str
+    null: str
+    default: str
+    length: str
+    comment: str
+
+
+FieldMapDict = Dict[str, Callable[..., str]]
+
+
 class Column(BaseModel):
     name: str
     data_type: str
     null: bool
     default: Any
-    comment: Optional[str]
+    comment: Optional[str] = None
     pk: bool
     unique: bool
     index: bool
-    length: Optional[int]
-    extra: Optional[str]
-    decimal_places: Optional[int]
-    max_digits: Optional[int]
+    length: Optional[int] = None
+    extra: Optional[str] = None
+    decimal_places: Optional[int] = None
+    max_digits: Optional[int] = None
 
-    def translate(self) -> dict:
+    def translate(self) -> ColumnInfoDict:
         comment = default = length = index = null = pk = ""
         if self.pk:
             pk = "pk=True, "
@@ -28,23 +43,24 @@ class Column(BaseModel):
             else:
                 if self.index:
                     index = "index=True, "
-        if self.data_type in ["varchar", "VARCHAR"]:
+        if self.data_type in ("varchar", "VARCHAR"):
             length = f"max_length={self.length}, "
-        if self.data_type in ["decimal", "numeric"]:
+        elif self.data_type in ("decimal", "numeric"):
             length_parts = []
             if self.max_digits:
                 length_parts.append(f"max_digits={self.max_digits}")
             if self.decimal_places:
                 length_parts.append(f"decimal_places={self.decimal_places}")
-            length = ", ".join(length_parts)
+            if length_parts:
+                length = ", ".join(length_parts) + ", "
         if self.null:
             null = "null=True, "
         if self.default is not None:
-            if self.data_type in ["tinyint", "INT"]:
+            if self.data_type in ("tinyint", "INT"):
                 default = f"default={'True' if self.default == '1' else 'False'}, "
             elif self.data_type == "bool":
                 default = f"default={'True' if self.default == 'true' else 'False'}, "
-            elif self.data_type in ["datetime", "timestamptz", "TIMESTAMP"]:
+            elif self.data_type in ("datetime", "timestamptz", "TIMESTAMP"):
                 if "CURRENT_TIMESTAMP" == self.default:
                     if "DEFAULT_GENERATED on update CURRENT_TIMESTAMP" == self.extra:
                         default = "auto_now=True, "
@@ -55,6 +71,8 @@ class Column(BaseModel):
                     default = f"default={self.default.split('::')[0]}, "
                 elif self.default.endswith("()"):
                     default = ""
+                elif self.default == "":
+                    default = 'default=""'
                 else:
                     default = f"default={self.default}, "
 
@@ -74,16 +92,16 @@ class Column(BaseModel):
 class Inspect:
     _table_template = "class {table}(Model):\n"
 
-    def __init__(self, conn: BaseDBAsyncClient, tables: Optional[List[str]] = None):
+    def __init__(self, conn: BaseDBAsyncClient, tables: list[str] | None = None) -> None:
         self.conn = conn
         try:
-            self.database = conn.database
+            self.database = conn.database  # type:ignore[attr-defined]
         except AttributeError:
             pass
         self.tables = tables
 
     @property
-    def field_map(self) -> dict:
+    def field_map(self) -> FieldMapDict:
         raise NotImplementedError
 
     async def inspect(self) -> str:
@@ -101,10 +119,10 @@ class Inspect:
             tables.append(model + "\n".join(fields))
         return result + "\n\n\n".join(tables)
 
-    async def get_columns(self, table: str) -> List[Column]:
+    async def get_columns(self, table: str) -> list[Column]:
         raise NotImplementedError
 
-    async def get_all_tables(self) -> List[str]:
+    async def get_all_tables(self) -> list[str]:
         raise NotImplementedError
 
     @classmethod

aerich/inspectdb/mysql.py

@@ -1,17 +1,18 @@
-from typing import List
+from __future__ import annotations
 
-from aerich.inspectdb import Column, Inspect
+from aerich.inspectdb import Column, FieldMapDict, Inspect
 
 
 class InspectMySQL(Inspect):
     @property
-    def field_map(self) -> dict:
+    def field_map(self) -> FieldMapDict:
         return {
             "int": self.int_field,
             "smallint": self.smallint_field,
             "tinyint": self.bool_field,
             "bigint": self.bigint_field,
             "varchar": self.char_field,
+            "char": self.char_field,
             "longtext": self.text_field,
             "text": self.text_field,
             "datetime": self.datetime_field,
@@ -23,12 +24,12 @@ class InspectMySQL(Inspect):
             "longblob": self.binary_field,
         }
 
-    async def get_all_tables(self) -> List[str]:
+    async def get_all_tables(self) -> list[str]:
         sql = "select TABLE_NAME from information_schema.TABLES where TABLE_SCHEMA=%s"
         ret = await self.conn.execute_query_dict(sql, [self.database])
         return list(map(lambda x: x["TABLE_NAME"], ret))
 
-    async def get_columns(self, table: str) -> List[Column]:
+    async def get_columns(self, table: str) -> list[Column]:
         columns = []
         sql = """select c.*, s.NON_UNIQUE, s.INDEX_NAME
 from information_schema.COLUMNS c
@@ -59,7 +60,8 @@ where c.TABLE_SCHEMA = %s
                     comment=row["COLUMN_COMMENT"],
                     unique=row["COLUMN_KEY"] == "UNI",
                     extra=row["EXTRA"],
-                    unque=unique,
+                    # TODO: why `unque`?
+                    unque=unique,  # type:ignore
                     index=index,
                     length=row["CHARACTER_MAXIMUM_LENGTH"],
                     max_digits=row["NUMERIC_PRECISION"],

aerich/inspectdb/postgres.py

@@ -1,17 +1,20 @@
-from typing import List, Optional
+from __future__ import annotations
 
-from tortoise import BaseDBAsyncClient
+from typing import TYPE_CHECKING
 
-from aerich.inspectdb import Column, Inspect
+from aerich.inspectdb import Column, FieldMapDict, Inspect
+
+if TYPE_CHECKING:
+    from tortoise.backends.base_postgres.client import BasePostgresClient
 
 
 class InspectPostgres(Inspect):
-    def __init__(self, conn: BaseDBAsyncClient, tables: Optional[List[str]] = None):
+    def __init__(self, conn: "BasePostgresClient", tables: list[str] | None = None) -> None:
         super().__init__(conn, tables)
-        self.schema = self.conn.server_settings.get("schema") or "public"
+        self.schema = conn.server_settings.get("schema") or "public"
 
     @property
-    def field_map(self) -> dict:
+    def field_map(self) -> FieldMapDict:
         return {
             "int4": self.int_field,
             "int8": self.int_field,
@@ -33,12 +36,12 @@ class InspectPostgres(Inspect):
             "timestamp": self.datetime_field,
         }
 
-    async def get_all_tables(self) -> List[str]:
+    async def get_all_tables(self) -> list[str]:
         sql = "select TABLE_NAME from information_schema.TABLES where table_catalog=$1 and table_schema=$2"
         ret = await self.conn.execute_query_dict(sql, [self.database, self.schema])
         return list(map(lambda x: x["table_name"], ret))
 
-    async def get_columns(self, table: str) -> List[Column]:
+    async def get_columns(self, table: str) -> list[Column]:
         columns = []
         sql = f"""select c.column_name,
        col_description('public.{table}'::regclass, ordinal_position) as column_comment,
@@ -55,7 +58,7 @@ from information_schema.constraint_column_usage const
          right join information_schema.columns c using (column_name, table_catalog, table_schema, table_name)
 where c.table_catalog = $1
   and c.table_name = $2
-  and c.table_schema = $3"""
+  and c.table_schema = $3"""  # nosec:B608
         ret = await self.conn.execute_query_dict(sql, [self.database, table, self.schema])
         for row in ret:
             columns.append(

aerich/inspectdb/sqlite.py

@@ -1,11 +1,11 @@
-from typing import List
+from __future__ import annotations
 
-from aerich.inspectdb import Column, Inspect
+from aerich.inspectdb import Column, FieldMapDict, Inspect
 
 
 class InspectSQLite(Inspect):
     @property
-    def field_map(self) -> dict:
+    def field_map(self) -> FieldMapDict:
         return {
             "INTEGER": self.int_field,
             "INT": self.bool_field,
@@ -21,7 +21,7 @@ class InspectSQLite(Inspect):
             "BLOB": self.binary_field,
         }
 
-    async def get_columns(self, table: str) -> List[Column]:
+    async def get_columns(self, table: str) -> list[Column]:
         columns = []
         sql = f"PRAGMA table_info({table})"
         ret = await self.conn.execute_query_dict(sql)
@@ -45,7 +45,7 @@ class InspectSQLite(Inspect):
             )
         return columns
 
-    async def _get_columns_index(self, table: str):
+    async def _get_columns_index(self, table: str) -> dict[str, str]:
         sql = f"PRAGMA index_list ({table})"
         indexes = await self.conn.execute_query_dict(sql)
         ret = {}
@@ -55,7 +55,7 @@ class InspectSQLite(Inspect):
             ret[index_info["name"]] = "unique" if index["unique"] else "index"
         return ret
 
-    async def get_all_tables(self) -> List[str]:
+    async def get_all_tables(self) -> list[str]:
         sql = "select tbl_name from sqlite_master where type='table' and name!='sqlite_sequence'"
         ret = await self.conn.execute_query_dict(sql)
         return list(map(lambda x: x["tbl_name"], ret))

aerich/migrate.py

@@ -1,11 +1,11 @@
+import hashlib
 import importlib
 import os
 from datetime import datetime
-from hashlib import md5
 from pathlib import Path
-from typing import Dict, List, Optional, Tuple, Type, Union
+from typing import Dict, Iterable, List, Optional, Set, Tuple, Type, Union, cast
 
-import click
+import asyncclick as click
 from dictdiffer import diff
 from tortoise import BaseDBAsyncClient, Model, Tortoise
 from tortoise.exceptions import OperationalError
@@ -37,16 +37,21 @@ class Migrate:
     _upgrade_m2m: List[str] = []
     _downgrade_m2m: List[str] = []
     _aerich = Aerich.__name__
-    _rename_old = []
-    _rename_new = []
+    _rename_old: List[str] = []
+    _rename_new: List[str] = []
 
     ddl: BaseDDL
+    ddl_class: Type[BaseDDL]
     _last_version_content: Optional[dict] = None
     app: str
     migrate_location: Path
     dialect: str
     _db_version: Optional[str] = None
 
+    @staticmethod
+    def get_field_by_name(name: str, fields: List[dict]) -> dict:
+        return next(filter(lambda x: x.get("name") == name, fields))
+
     @classmethod
     def get_all_version_files(cls) -> List[str]:
         return sorted(
@@ -56,35 +61,35 @@ class Migrate:
 
     @classmethod
     def _get_model(cls, model: str) -> Type[Model]:
-        return Tortoise.apps.get(cls.app).get(model)
+        return Tortoise.apps[cls.app][model]
 
     @classmethod
     async def get_last_version(cls) -> Optional[Aerich]:
         try:
             return await Aerich.filter(app=cls.app).first()
         except OperationalError:
-            pass
+            return None
 
     @classmethod
-    async def _get_db_version(cls, connection: BaseDBAsyncClient):
+    async def _get_db_version(cls, connection: BaseDBAsyncClient) -> None:
         if cls.dialect == "mysql":
             sql = "select version() as version"
             ret = await connection.execute_query(sql)
             cls._db_version = ret[1][0].get("version")
 
     @classmethod
-    async def load_ddl_class(cls):
+    async def load_ddl_class(cls) -> Type[BaseDDL]:
         ddl_dialect_module = importlib.import_module(f"aerich.ddl.{cls.dialect}")
         return getattr(ddl_dialect_module, f"{cls.dialect.capitalize()}DDL")
 
     @classmethod
-    async def init(cls, config: dict, app: str, location: str):
+    async def init(cls, config: dict, app: str, location: str) -> None:
         await Tortoise.init(config=config)
         last_version = await cls.get_last_version()
         cls.app = app
         cls.migrate_location = Path(location, app)
         if last_version:
-            cls._last_version_content = last_version.content
+            cls._last_version_content = cast(dict, last_version.content)
 
         connection = get_app_connection(config, app)
         cls.dialect = connection.schema_generator.DIALECT
@@ -93,7 +98,7 @@ class Migrate:
         await cls._get_db_version(connection)
 
     @classmethod
-    async def _get_last_version_num(cls):
+    async def _get_last_version_num(cls) -> Optional[int]:
         last_version = await cls.get_last_version()
         if not last_version:
             return None
@@ -101,7 +106,7 @@ class Migrate:
         return int(version.split("_", 1)[0])
 
     @classmethod
-    async def generate_version(cls, name=None):
+    async def generate_version(cls, name=None) -> str:
         now = datetime.now().strftime("%Y%m%d%H%M%S").replace("/", "")
         last_version_num = await cls._get_last_version_num()
         if last_version_num is None:
@@ -112,33 +117,31 @@ class Migrate:
         return version
 
     @classmethod
-    async def _generate_diff_py(cls, name):
+    async def _generate_diff_py(cls, name) -> str:
         version = await cls.generate_version(name)
         # delete if same version exists
         for version_file in cls.get_all_version_files():
             if version_file.startswith(version.split("_")[0]):
                 os.unlink(Path(cls.migrate_location, version_file))
 
-        version_file = Path(cls.migrate_location, version)
-        content = MIGRATE_TEMPLATE.format(
-            upgrade_sql=";\n        ".join(cls.upgrade_operators) + ";",
-            downgrade_sql=";\n        ".join(cls.downgrade_operators) + ";",
-        )
-
-        with open(version_file, "w", encoding="utf-8") as f:
-            f.write(content)
+        content = cls._get_diff_file_content()
+        Path(cls.migrate_location, version).write_text(content, encoding="utf-8")
         return version
 
     @classmethod
-    async def migrate(cls, name) -> str:
+    async def migrate(cls, name: str, empty: bool) -> str:
         """
         diff old models and new models to generate diff content
-        :param name:
+        :param name: str name for migration
+        :param empty: bool if True generates empty migration
         :return:
         """
+        if empty:
+            return await cls._generate_diff_py(name)
         new_version_content = get_models_describe(cls.app)
-        cls.diff_models(cls._last_version_content, new_version_content)
-        cls.diff_models(new_version_content, cls._last_version_content, False)
+        last_version = cast(dict, cls._last_version_content)
+        cls.diff_models(last_version, new_version_content)
+        cls.diff_models(new_version_content, last_version, False)
 
         cls._merge_operators()
 
@@ -148,7 +151,23 @@ class Migrate:
         return await cls._generate_diff_py(name)
 
     @classmethod
-    def _add_operator(cls, operator: str, upgrade=True, fk_m2m_index=False):
+    def _get_diff_file_content(cls) -> str:
+        """
+        builds content for diff file from template
+        """
+
+        def join_lines(lines: List[str]) -> str:
+            if not lines:
+                return ""
+            return ";\n        ".join(lines) + ";"
+
+        return MIGRATE_TEMPLATE.format(
+            upgrade_sql=join_lines(cls.upgrade_operators),
+            downgrade_sql=join_lines(cls.downgrade_operators),
+        )
+
+    @classmethod
+    def _add_operator(cls, operator: str, upgrade=True, fk_m2m_index=False) -> None:
         """
         add operator,differentiate fk because fk is order limit
         :param operator:
@@ -169,19 +188,37 @@ class Migrate:
                 cls.downgrade_operators.append(operator)
 
     @classmethod
-    def _handle_indexes(cls, model: Type[Model], indexes: List[Union[Tuple[str], Index]]):
-        ret = []
+    def _handle_indexes(cls, model: Type[Model], indexes: List[Union[Tuple[str], Index]]) -> list:
+        ret: list = []
+
+        def index_hash(self) -> str:
+            h = hashlib.new("MD5", usedforsecurity=False)  # type:ignore[call-arg]
+            h.update(
+                self.index_name(cls.ddl.schema_generator, model).encode()
+                + self.__class__.__name__.encode()
+            )
+            return h.hexdigest()
+
         for index in indexes:
             if isinstance(index, Index):
-                index.__hash__ = lambda self: md5(  # nosec: B303
-                    self.index_name(cls.ddl.schema_generator, model).encode()
-                    + self.__class__.__name__.encode()
-                ).hexdigest()
+                index.__hash__ = index_hash  # type:ignore[method-assign,assignment]
             ret.append(index)
         return ret
 
     @classmethod
-    def diff_models(cls, old_models: Dict[str, dict], new_models: Dict[str, dict], upgrade=True):
+    def _get_indexes(cls, model, model_describe: dict) -> Set[Union[Index, Tuple[str, ...]]]:
+        indexes: Set[Union[Index, Tuple[str, ...]]] = set()
+        for x in cls._handle_indexes(model, model_describe.get("indexes", [])):
+            if isinstance(x, Index):
+                indexes.add(x)
+            else:
+                indexes.add(cast(Tuple[str, ...], tuple(x)))
+        return indexes
+
+    @classmethod
+    def diff_models(
+        cls, old_models: Dict[str, dict], new_models: Dict[str, dict], upgrade=True
+    ) -> None:
         """
         diff models and add operators
         :param old_models:
@@ -194,39 +231,35 @@ class Migrate:
         new_models.pop(_aerich, None)
 
         for new_model_str, new_model_describe in new_models.items():
-            model = cls._get_model(new_model_describe.get("name").split(".")[1])
+            model = cls._get_model(new_model_describe["name"].split(".")[1])
 
-            if new_model_str not in old_models.keys():
+            if new_model_str not in old_models:
                 if upgrade:
                     cls._add_operator(cls.add_model(model), upgrade)
                 else:
                     # we can't find origin model when downgrade, so skip
                     pass
             else:
-                old_model_describe = old_models.get(new_model_str)
+                old_model_describe = cast(dict, old_models.get(new_model_str))
                 # rename table
-                new_table = new_model_describe.get("table")
-                old_table = old_model_describe.get("table")
+                new_table = cast(str, new_model_describe.get("table"))
+                old_table = cast(str, old_model_describe.get("table"))
                 if new_table != old_table:
                     cls._add_operator(cls.rename_table(model, old_table, new_table), upgrade)
                 old_unique_together = set(
-                    map(lambda x: tuple(x), old_model_describe.get("unique_together"))
+                    map(
+                        lambda x: tuple(x),
+                        cast(List[Iterable[str]], old_model_describe.get("unique_together")),
+                    )
                 )
                 new_unique_together = set(
-                    map(lambda x: tuple(x), new_model_describe.get("unique_together"))
-                )
-                old_indexes = set(
                     map(
-                        lambda x: x if isinstance(x, Index) else tuple(x),
-                        cls._handle_indexes(model, old_model_describe.get("indexes", [])),
-                    )
-                )
-                new_indexes = set(
-                    map(
-                        lambda x: x if isinstance(x, Index) else tuple(x),
-                        cls._handle_indexes(model, new_model_describe.get("indexes", [])),
+                        lambda x: tuple(x),
+                        cast(List[Iterable[str]], new_model_describe.get("unique_together")),
                     )
                 )
+                old_indexes = cls._get_indexes(model, old_model_describe)
+                new_indexes = cls._get_indexes(model, new_model_describe)
                 old_pk_field = old_model_describe.get("pk_field")
                 new_pk_field = new_model_describe.get("pk_field")
                 # pk field
@@ -236,12 +269,19 @@ class Migrate:
                     if action == "change" and option == "name":
                         cls._add_operator(cls._rename_field(model, *change), upgrade)
                 # m2m fields
-                old_m2m_fields = old_model_describe.get("m2m_fields")
-                new_m2m_fields = new_model_describe.get("m2m_fields")
+                old_m2m_fields = cast(List[dict], old_model_describe.get("m2m_fields"))
+                new_m2m_fields = cast(List[dict], new_model_describe.get("m2m_fields"))
                 for action, option, change in diff(old_m2m_fields, new_m2m_fields):
                     if change[0][0] == "db_constraint":
                         continue
-                    table = change[0][1].get("through")
+                    new_value = change[0][1]
+                    if isinstance(new_value, str):
+                        for new_m2m_field in new_m2m_fields:
+                            if new_m2m_field["name"] == new_value:
+                                table = cast(str, new_m2m_field.get("through"))
+                                break
+                    else:
+                        table = new_value.get("through")
                     if action == "add":
                         add = False
                         if upgrade and table not in cls._upgrade_m2m:
@@ -251,12 +291,9 @@ class Migrate:
                             cls._downgrade_m2m.append(table)
                             add = True
                         if add:
+                            ref_desc = cast(dict, new_models.get(new_value.get("model_name")))
                             cls._add_operator(
-                                cls.create_m2m(
-                                    model,
-                                    change[0][1],
-                                    new_models.get(change[0][1].get("model_name")),
-                                ),
+                                cls.create_m2m(model, new_value, ref_desc),
                                 upgrade,
                                 fk_m2m_index=True,
                             )
@@ -277,38 +314,36 @@ class Migrate:
                 for index in old_unique_together.difference(new_unique_together):
                     cls._add_operator(cls._drop_index(model, index, True), upgrade, True)
                 # add indexes
-                for index in new_indexes.difference(old_indexes):
-                    cls._add_operator(cls._add_index(model, index, False), upgrade, True)
+                for idx in new_indexes.difference(old_indexes):
+                    cls._add_operator(cls._add_index(model, idx, False), upgrade, True)
                 # remove indexes
-                for index in old_indexes.difference(new_indexes):
-                    cls._add_operator(cls._drop_index(model, index, False), upgrade, True)
+                for idx in old_indexes.difference(new_indexes):
+                    cls._add_operator(cls._drop_index(model, idx, False), upgrade, True)
                 old_data_fields = list(
                     filter(
                         lambda x: x.get("db_field_types") is not None,
-                        old_model_describe.get("data_fields"),
+                        cast(List[dict], old_model_describe.get("data_fields")),
                     )
                 )
                 new_data_fields = list(
                     filter(
                         lambda x: x.get("db_field_types") is not None,
-                        new_model_describe.get("data_fields"),
+                        cast(List[dict], new_model_describe.get("data_fields")),
                     )
                 )
 
-                old_data_fields_name = list(map(lambda x: x.get("name"), old_data_fields))
-                new_data_fields_name = list(map(lambda x: x.get("name"), new_data_fields))
+                old_data_fields_name = cast(List[str], [i.get("name") for i in old_data_fields])
+                new_data_fields_name = cast(List[str], [i.get("name") for i in new_data_fields])
 
                 # add fields or rename fields
                 for new_data_field_name in set(new_data_fields_name).difference(
                     set(old_data_fields_name)
                 ):
-                    new_data_field = next(
-                        filter(lambda x: x.get("name") == new_data_field_name, new_data_fields)
-                    )
+                    new_data_field = cls.get_field_by_name(new_data_field_name, new_data_fields)
                     is_rename = False
                     for old_data_field in old_data_fields:
                         changes = list(diff(old_data_field, new_data_field))
-                        old_data_field_name = old_data_field.get("name")
+                        old_data_field_name = cast(str, old_data_field.get("name"))
                         if len(changes) == 2:
                             # rename field
                             if (
@@ -369,7 +404,7 @@ class Migrate:
                         if new_data_field["indexed"]:
                             cls._add_operator(
                                 cls._add_index(
-                                    model, {new_data_field["db_column"]}, new_data_field["unique"]
+                                    model, (new_data_field["db_column"],), new_data_field["unique"]
                                 ),
                                 upgrade,
                                 True,
@@ -383,45 +418,35 @@ class Migrate:
                         not upgrade and old_data_field_name in cls._rename_new
                     ):
                         continue
-                    old_data_field = next(
-                        filter(lambda x: x.get("name") == old_data_field_name, old_data_fields)
-                    )
-                    db_column = old_data_field["db_column"]
+                    old_data_field = cls.get_field_by_name(old_data_field_name, old_data_fields)
+                    db_column = cast(str, old_data_field["db_column"])
                     cls._add_operator(
-                        cls._remove_field(
-                            model,
-                            db_column,
-                        ),
+                        cls._remove_field(model, db_column),
                         upgrade,
                     )
                     if old_data_field["indexed"]:
+                        is_unique_field = old_data_field.get("unique")
                         cls._add_operator(
-                            cls._drop_index(
-                                model,
-                                {db_column},
-                            ),
+                            cls._drop_index(model, {db_column}, is_unique_field),
                             upgrade,
                             True,
                         )
 
-                old_fk_fields = old_model_describe.get("fk_fields")
-                new_fk_fields = new_model_describe.get("fk_fields")
+                old_fk_fields = cast(List[dict], old_model_describe.get("fk_fields"))
+                new_fk_fields = cast(List[dict], new_model_describe.get("fk_fields"))
 
-                old_fk_fields_name = list(map(lambda x: x.get("name"), old_fk_fields))
-                new_fk_fields_name = list(map(lambda x: x.get("name"), new_fk_fields))
+                old_fk_fields_name: List[str] = [i.get("name", "") for i in old_fk_fields]
+                new_fk_fields_name: List[str] = [i.get("name", "") for i in new_fk_fields]
 
                 # add fk
                 for new_fk_field_name in set(new_fk_fields_name).difference(
                     set(old_fk_fields_name)
                 ):
-                    fk_field = next(
-                        filter(lambda x: x.get("name") == new_fk_field_name, new_fk_fields)
-                    )
+                    fk_field = cls.get_field_by_name(new_fk_field_name, new_fk_fields)
                     if fk_field.get("db_constraint"):
+                        ref_describe = cast(dict, new_models[fk_field["python_type"]])
                         cls._add_operator(
-                            cls._add_fk(
-                                model, fk_field, new_models.get(fk_field.get("python_type"))
-                            ),
+                            cls._add_fk(model, fk_field, ref_describe),
                             upgrade,
                             fk_m2m_index=True,
                         )
@@ -429,37 +454,33 @@ class Migrate:
                 for old_fk_field_name in set(old_fk_fields_name).difference(
                     set(new_fk_fields_name)
                 ):
-                    old_fk_field = next(
-                        filter(lambda x: x.get("name") == old_fk_field_name, old_fk_fields)
+                    old_fk_field = cls.get_field_by_name(
+                        old_fk_field_name, cast(List[dict], old_fk_fields)
                     )
                     if old_fk_field.get("db_constraint"):
+                        ref_describe = cast(dict, old_models[old_fk_field["python_type"]])
                         cls._add_operator(
-                            cls._drop_fk(
-                                model, old_fk_field, old_models.get(old_fk_field.get("python_type"))
-                            ),
+                            cls._drop_fk(model, old_fk_field, ref_describe),
                             upgrade,
                             fk_m2m_index=True,
                         )
                 # change fields
                 for field_name in set(new_data_fields_name).intersection(set(old_data_fields_name)):
-                    old_data_field = next(
-                        filter(lambda x: x.get("name") == field_name, old_data_fields)
-                    )
-                    new_data_field = next(
-                        filter(lambda x: x.get("name") == field_name, new_data_fields)
-                    )
+                    old_data_field = cls.get_field_by_name(field_name, old_data_fields)
+                    new_data_field = cls.get_field_by_name(field_name, new_data_fields)
                     changes = diff(old_data_field, new_data_field)
                     modified = False
                     for change in changes:
                         _, option, old_new = change
                         if option == "indexed":
                             # change index
-                            unique = new_data_field.get("unique")
                             if old_new[0] is False and old_new[1] is True:
+                                unique = new_data_field.get("unique")
                                 cls._add_operator(
                                     cls._add_index(model, (field_name,), unique), upgrade, True
                                 )
                             else:
+                                unique = old_data_field.get("unique")
                                 cls._add_operator(
                                     cls._drop_index(model, (field_name,), unique), upgrade, True
                                 )
@@ -486,6 +507,9 @@ class Migrate:
                         elif option == "nullable":
                             # change nullable
                             cls._add_operator(cls._alter_null(model, new_data_field), upgrade)
+                        elif option == "description":
+                            # change comment
+                            cls._add_operator(cls._set_comment(model, new_data_field), upgrade)
                         else:
                             if modified:
                                 continue
@@ -496,103 +520,118 @@ class Migrate:
                             )
                             modified = True
 
-        for old_model in old_models:
-            if old_model not in new_models.keys():
-                cls._add_operator(cls.drop_model(old_models.get(old_model).get("table")), upgrade)
+        for old_model in old_models.keys() - new_models.keys():
+            cls._add_operator(cls.drop_model(old_models[old_model]["table"]), upgrade)
 
     @classmethod
-    def rename_table(cls, model: Type[Model], old_table_name: str, new_table_name: str):
+    def rename_table(cls, model: Type[Model], old_table_name: str, new_table_name: str) -> str:
         return cls.ddl.rename_table(model, old_table_name, new_table_name)
 
     @classmethod
-    def add_model(cls, model: Type[Model]):
+    def add_model(cls, model: Type[Model]) -> str:
         return cls.ddl.create_table(model)
 
     @classmethod
-    def drop_model(cls, table_name: str):
+    def drop_model(cls, table_name: str) -> str:
         return cls.ddl.drop_table(table_name)
 
     @classmethod
-    def create_m2m(cls, model: Type[Model], field_describe: dict, reference_table_describe: dict):
+    def create_m2m(
+        cls, model: Type[Model], field_describe: dict, reference_table_describe: dict
+    ) -> str:
         return cls.ddl.create_m2m(model, field_describe, reference_table_describe)
 
     @classmethod
-    def drop_m2m(cls, table_name: str):
+    def drop_m2m(cls, table_name: str) -> str:
         return cls.ddl.drop_m2m(table_name)
 
     @classmethod
-    def _resolve_fk_fields_name(cls, model: Type[Model], fields_name: Tuple[str]):
+    def _resolve_fk_fields_name(cls, model: Type[Model], fields_name: Iterable[str]) -> List[str]:
         ret = []
         for field_name in fields_name:
-            field = model._meta.fields_map[field_name]
-            if field.source_field:
-                ret.append(field.source_field)
-            elif field_name in model._meta.fk_fields:
-                ret.append(field_name + "_id")
+            try:
+                field = model._meta.fields_map[field_name]
+            except KeyError:
+                # field dropped or to be add
+                pass
             else:
-                ret.append(field_name)
+                if field.source_field:
+                    field_name = field.source_field
+                elif field_name in model._meta.fk_fields:
+                    field_name += "_id"
+            ret.append(field_name)
         return ret
 
     @classmethod
-    def _drop_index(cls, model: Type[Model], fields_name: Union[Tuple[str], Index], unique=False):
+    def _drop_index(
+        cls, model: Type[Model], fields_name: Union[Iterable[str], Index], unique=False
+    ) -> str:
         if isinstance(fields_name, Index):
             return cls.ddl.drop_index_by_name(
                 model, fields_name.index_name(cls.ddl.schema_generator, model)
             )
-        fields_name = cls._resolve_fk_fields_name(model, fields_name)
-        return cls.ddl.drop_index(model, fields_name, unique)
+        field_names = cls._resolve_fk_fields_name(model, fields_name)
+        return cls.ddl.drop_index(model, field_names, unique)
 
     @classmethod
-    def _add_index(cls, model: Type[Model], fields_name: Union[Tuple[str], Index], unique=False):
+    def _add_index(
+        cls, model: Type[Model], fields_name: Union[Iterable[str], Index], unique=False
+    ) -> str:
         if isinstance(fields_name, Index):
             return fields_name.get_sql(cls.ddl.schema_generator, model, False)
-        fields_name = cls._resolve_fk_fields_name(model, fields_name)
-        return cls.ddl.add_index(model, fields_name, unique)
+        field_names = cls._resolve_fk_fields_name(model, fields_name)
+        return cls.ddl.add_index(model, field_names, unique)
 
     @classmethod
-    def _add_field(cls, model: Type[Model], field_describe: dict, is_pk: bool = False):
+    def _add_field(cls, model: Type[Model], field_describe: dict, is_pk: bool = False) -> str:
         return cls.ddl.add_column(model, field_describe, is_pk)
 
     @classmethod
-    def _alter_default(cls, model: Type[Model], field_describe: dict):
+    def _alter_default(cls, model: Type[Model], field_describe: dict) -> str:
         return cls.ddl.alter_column_default(model, field_describe)
 
     @classmethod
-    def _alter_null(cls, model: Type[Model], field_describe: dict):
+    def _alter_null(cls, model: Type[Model], field_describe: dict) -> str:
         return cls.ddl.alter_column_null(model, field_describe)
 
     @classmethod
-    def _set_comment(cls, model: Type[Model], field_describe: dict):
+    def _set_comment(cls, model: Type[Model], field_describe: dict) -> str:
         return cls.ddl.set_comment(model, field_describe)
 
     @classmethod
-    def _modify_field(cls, model: Type[Model], field_describe: dict):
+    def _modify_field(cls, model: Type[Model], field_describe: dict) -> str:
         return cls.ddl.modify_column(model, field_describe)
 
     @classmethod
-    def _drop_fk(cls, model: Type[Model], field_describe: dict, reference_table_describe: dict):
+    def _drop_fk(
+        cls, model: Type[Model], field_describe: dict, reference_table_describe: dict
+    ) -> str:
         return cls.ddl.drop_fk(model, field_describe, reference_table_describe)
 
     @classmethod
-    def _remove_field(cls, model: Type[Model], column_name: str):
+    def _remove_field(cls, model: Type[Model], column_name: str) -> str:
         return cls.ddl.drop_column(model, column_name)
 
     @classmethod
-    def _rename_field(cls, model: Type[Model], old_field_name: str, new_field_name: str):
+    def _rename_field(cls, model: Type[Model], old_field_name: str, new_field_name: str) -> str:
         return cls.ddl.rename_column(model, old_field_name, new_field_name)
 
     @classmethod
-    def _change_field(cls, model: Type[Model], old_field_describe: dict, new_field_describe: dict):
-        db_field_types = new_field_describe.get("db_field_types")
+    def _change_field(
+        cls, model: Type[Model], old_field_describe: dict, new_field_describe: dict
+    ) -> str:
+        db_field_types = cast(dict, new_field_describe.get("db_field_types"))
         return cls.ddl.change_column(
             model,
-            old_field_describe.get("db_column"),
-            new_field_describe.get("db_column"),
-            db_field_types.get(cls.dialect) or db_field_types.get(""),
+            cast(str, old_field_describe.get("db_column")),
+            cast(str, new_field_describe.get("db_column")),
+            cast(str, db_field_types.get(cls.dialect) or db_field_types.get("")),
         )
 
     @classmethod
-    def _add_fk(cls, model: Type[Model], field_describe: dict, reference_table_describe: dict):
+    def _add_fk(
+        cls, model: Type[Model], field_describe: dict, reference_table_describe: dict
+    ) -> str:
         """
         add fk
         :param model:
@@ -603,7 +642,7 @@ class Migrate:
         return cls.ddl.add_fk(model, field_describe, reference_table_describe)
 
     @classmethod
-    def _merge_operators(cls):
+    def _merge_operators(cls) -> None:
         """
         fk/m2m/index must be last when add,first when drop
         :return:

aerich/models.py

@@ -9,7 +9,7 @@ MAX_APP_LENGTH = 100
 class Aerich(Model):
     version = fields.CharField(max_length=MAX_VERSION_LENGTH)
     app = fields.CharField(max_length=MAX_APP_LENGTH)
-    content = fields.JSONField(encoder=encoder, decoder=decoder)
+    content: dict = fields.JSONField(encoder=encoder, decoder=decoder)
 
     class Meta:
         ordering = ["-id"]

aerich/utils.py

@@ -3,9 +3,10 @@ import os
 import re
 import sys
 from pathlib import Path
-from typing import Dict
+from types import ModuleType
+from typing import Dict, Optional, Union
 
-from click import BadOptionUsage, ClickException, Context
+from asyncclick import BadOptionUsage, ClickException, Context
 from tortoise import BaseDBAsyncClient, Tortoise
 
 
@@ -84,19 +85,19 @@ def get_models_describe(app: str) -> Dict:
     :return:
     """
     ret = {}
-    for model in Tortoise.apps.get(app).values():
+    for model in Tortoise.apps[app].values():
         describe = model.describe()
         ret[describe.get("name")] = describe
     return ret
 
 
-def is_default_function(string: str):
+def is_default_function(string: str) -> Optional[re.Match]:
     return re.match(r"^<function.+>$", str(string or ""))
 
 
-def import_py_file(file: Path):
+def import_py_file(file: Union[str, Path]) -> ModuleType:
     module_name, file_ext = os.path.splitext(os.path.split(file)[-1])
     spec = importlib.util.spec_from_file_location(module_name, file)
-    module = importlib.util.module_from_spec(spec)
-    spec.loader.exec_module(module)
+    module = importlib.util.module_from_spec(spec)  # type:ignore[arg-type]
+    spec.loader.exec_module(module)  # type:ignore[union-attr]
     return module

aerich/version.py

@@ -1 +1 @@
-__version__ = "0.7.2"
+__version__ = "0.8.0"

conftest.py

@@ -1,19 +1,22 @@
 import asyncio
 import os
+from typing import Generator
 
 import pytest
 from tortoise import Tortoise, expand_db_url, generate_schema_for_client
 from tortoise.backends.asyncpg.schema_generator import AsyncpgSchemaGenerator
 from tortoise.backends.mysql.schema_generator import MySQLSchemaGenerator
 from tortoise.backends.sqlite.schema_generator import SqliteSchemaGenerator
+from tortoise.exceptions import DBConnectionError, OperationalError
 
 from aerich.ddl.mysql import MysqlDDL
 from aerich.ddl.postgres import PostgresDDL
 from aerich.ddl.sqlite import SqliteDDL
 from aerich.migrate import Migrate
 
-db_url = os.getenv("TEST_DB", "sqlite://:memory:")
-db_url_second = os.getenv("TEST_DB_SECOND", "sqlite://:memory:")
+MEMORY_SQLITE = "sqlite://:memory:"
+db_url = os.getenv("TEST_DB", MEMORY_SQLITE)
+db_url_second = os.getenv("TEST_DB_SECOND", MEMORY_SQLITE)
 tortoise_orm = {
     "connections": {
         "default": expand_db_url(db_url, True),
@@ -27,7 +30,7 @@ tortoise_orm = {
 
 
 @pytest.fixture(scope="function", autouse=True)
-def reset_migrate():
+def reset_migrate() -> None:
     Migrate.upgrade_operators = []
     Migrate.downgrade_operators = []
     Migrate._upgrade_fk_m2m_index_operators = []
@@ -37,20 +40,27 @@ def reset_migrate():
 
 
 @pytest.fixture(scope="session")
-def event_loop():
+def event_loop() -> Generator:
     policy = asyncio.get_event_loop_policy()
     res = policy.new_event_loop()
     asyncio.set_event_loop(res)
-    res._close = res.close
-    res.close = lambda: None
+    res._close = res.close  # type:ignore[attr-defined]
+    res.close = lambda: None  # type:ignore[method-assign]
 
     yield res
 
-    res._close()
+    res._close()  # type:ignore[attr-defined]
 
 
 @pytest.fixture(scope="session", autouse=True)
-async def initialize_tests(event_loop, request):
+async def initialize_tests(event_loop, request) -> None:
+    # Placing init outside the try block since it doesn't
+    # establish connections to the DB eagerly.
+    await Tortoise.init(config=tortoise_orm)
+    try:
+        await Tortoise._drop_databases()
+    except (DBConnectionError, OperationalError):
+        pass
     await Tortoise.init(config=tortoise_orm, _create_db=True)
     await generate_schema_for_client(Tortoise.get_connection("default"), safe=True)
 

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "aerich"
-version = "0.7.2"
+version = "0.8.0"
 description = "A database migrations tool for Tortoise ORM."
 authors = ["long2ice <long2ice@gmail.com>"]
 license = "Apache-2.0"
@@ -15,52 +15,57 @@ packages = [
 include = ["CHANGELOG.md", "LICENSE", "README.md"]
 
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.8"
 tortoise-orm = "*"
-click = "*"
 asyncpg = { version = "*", optional = true }
-asyncmy = { version = "^0.2.8rc1", optional = true, allow-prereleases = true }
-pydantic = "*"
+asyncmy = { version = "^0.2.9", optional = true, allow-prereleases = true }
+pydantic = "^2.0"
 dictdiffer = "*"
 tomlkit = "*"
+asyncclick = "^8.1.7.2"
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 ruff = "*"
 isort = "*"
 black = "*"
 pytest = "*"
 pytest-xdist = "*"
-pytest-asyncio = "*"
+# Breaking change in 0.23.*
+# https://github.com/pytest-dev/pytest-asyncio/issues/706
+pytest-asyncio = "^0.21.2"
 bandit = "*"
 pytest-mock = "*"
 cryptography = "*"
+mypy = "^1.10.0"
 
 [tool.poetry.extras]
 asyncmy = ["asyncmy"]
 asyncpg = ["asyncpg"]
 
+
 [tool.aerich]
 tortoise_orm = "conftest.tortoise_orm"
 location = "./migrations"
 src_folder = "./."
 
 [build-system]
-requires = ["poetry>=0.12"]
-build-backend = "poetry.masonry.api"
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
 
 [tool.poetry.scripts]
 aerich = "aerich.cli:main"
 
 [tool.black]
 line-length = 100
-target-version = ['py36', 'py37', 'py38', 'py39']
+target-version = ['py38', 'py39', 'py310', 'py311', 'py312']
 
 [tool.pytest.ini_options]
 asyncio_mode = 'auto'
 
 [tool.mypy]
 pretty = true
+python_version = "3.8"
 ignore_missing_imports = true
 
-[tool.ruff]
+[tool.ruff.lint]
 ignore = ['E501']

tests/models.py

@@ -33,11 +33,11 @@ class User(Model):
 
 
 class Email(Model):
-    email_id = fields.IntField(pk=True)
-    email = fields.CharField(max_length=200, index=True)
+    email_id = fields.IntField(primary_key=True)
+    email = fields.CharField(max_length=200, db_index=True)
     is_primary = fields.BooleanField(default=False)
     address = fields.CharField(max_length=200)
-    users = fields.ManyToManyField("models.User")
+    users: fields.ManyToManyRelation[User] = fields.ManyToManyField("models.User")
 
 
 def default_name():
@@ -47,12 +47,15 @@ def default_name():
 class Category(Model):
     slug = fields.CharField(max_length=100)
     name = fields.CharField(max_length=200, null=True, default=default_name)
-    user = fields.ForeignKeyField("models.User", description="User")
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models.User", description="User"
+    )
+    title = fields.CharField(max_length=20, unique=False)
     created_at = fields.DatetimeField(auto_now_add=True)
 
 
 class Product(Model):
-    categories = fields.ManyToManyField("models.Category")
+    categories: fields.ManyToManyRelation[Category] = fields.ManyToManyField("models.Category")
     name = fields.CharField(max_length=50)
     view_num = fields.IntField(description="View Num", default=0)
     sort = fields.IntField()
@@ -72,9 +75,11 @@ class Product(Model):
 class Config(Model):
     label = fields.CharField(max_length=200)
     key = fields.CharField(max_length=20)
-    value = fields.JSONField()
+    value: dict = fields.JSONField()
     status: Status = fields.IntEnumField(Status)
-    user = fields.ForeignKeyField("models.User", description="User")
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models.User", description="User"
+    )
 
 
 class NewModel(Model):

tests/models_second.py

@@ -34,18 +34,24 @@ class User(Model):
 class Email(Model):
     email = fields.CharField(max_length=200)
     is_primary = fields.BooleanField(default=False)
-    user = fields.ForeignKeyField("models_second.User", db_constraint=False)
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models_second.User", db_constraint=False
+    )
 
 
 class Category(Model):
     slug = fields.CharField(max_length=200)
     name = fields.CharField(max_length=200)
-    user = fields.ForeignKeyField("models_second.User", description="User")
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models_second.User", description="User"
+    )
     created_at = fields.DatetimeField(auto_now_add=True)
 
 
 class Product(Model):
-    categories = fields.ManyToManyField("models_second.Category")
+    categories: fields.ManyToManyRelation[Category] = fields.ManyToManyField(
+        "models_second.Category"
+    )
     name = fields.CharField(max_length=50)
     view_num = fields.IntField(description="View Num")
     sort = fields.IntField()
@@ -61,5 +67,5 @@ class Product(Model):
 class Config(Model):
     label = fields.CharField(max_length=200)
     key = fields.CharField(max_length=20)
-    value = fields.JSONField()
+    value: dict = fields.JSONField()
     status: Status = fields.IntEnumField(Status, default=Status.on)

tests/old_models.py

@@ -35,18 +35,23 @@ class User(Model):
 class Email(Model):
     email = fields.CharField(max_length=200)
     is_primary = fields.BooleanField(default=False)
-    user = fields.ForeignKeyField("models.User", db_constraint=False)
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models.User", db_constraint=False
+    )
 
 
 class Category(Model):
     slug = fields.CharField(max_length=200)
     name = fields.CharField(max_length=200)
-    user = fields.ForeignKeyField("models.User", description="User")
+    user: fields.ForeignKeyRelation[User] = fields.ForeignKeyField(
+        "models.User", description="User"
+    )
     created_at = fields.DatetimeField(auto_now_add=True)
 
 
 class Product(Model):
-    categories = fields.ManyToManyField("models.Category")
+    categories: fields.ManyToManyRelation[Category] = fields.ManyToManyField("models.Category")
+    uid = fields.IntField(source_field="uuid", unique=True)
     name = fields.CharField(max_length=50)
     view_num = fields.IntField(description="View Num")
     sort = fields.IntField()
@@ -60,9 +65,10 @@ class Product(Model):
 
 
 class Config(Model):
+    name = fields.CharField(max_length=100, unique=True)
     label = fields.CharField(max_length=200)
     key = fields.CharField(max_length=20)
-    value = fields.JSONField()
+    value: dict = fields.JSONField()
     status: Status = fields.IntEnumField(Status, default=Status.on)
 
     class Meta:

tests/test_ddl.py

@@ -14,6 +14,7 @@ def test_create_table():
     `id` INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
     `slug` VARCHAR(100) NOT NULL,
     `name` VARCHAR(200),
+    `title` VARCHAR(20) NOT NULL,
     `created_at` DATETIME(6) NOT NULL  DEFAULT CURRENT_TIMESTAMP(6),
     `user_id` INT NOT NULL COMMENT 'User',
     CONSTRAINT `fk_category_user_e2e3874c` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE
@@ -27,6 +28,7 @@ def test_create_table():
     "id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
     "slug" VARCHAR(100) NOT NULL,
     "name" VARCHAR(200),
+    "title" VARCHAR(20) NOT NULL,
     "created_at" TIMESTAMP NOT NULL  DEFAULT CURRENT_TIMESTAMP,
     "user_id" INT NOT NULL REFERENCES "user" ("id") ON DELETE CASCADE /* User */
 )"""
@@ -39,6 +41,7 @@ def test_create_table():
     "id" SERIAL NOT NULL PRIMARY KEY,
     "slug" VARCHAR(100) NOT NULL,
     "name" VARCHAR(200),
+    "title" VARCHAR(20) NOT NULL,
     "created_at" TIMESTAMPTZ NOT NULL  DEFAULT CURRENT_TIMESTAMP,
     "user_id" INT NOT NULL REFERENCES "user" ("id") ON DELETE CASCADE
 );
@@ -151,9 +154,7 @@ def test_add_index():
     index_u = Migrate.ddl.add_index(Category, ["name"], True)
     if isinstance(Migrate.ddl, MysqlDDL):
         assert index == "ALTER TABLE `category` ADD INDEX `idx_category_name_8b0cb9` (`name`)"
-        assert (
-            index_u == "ALTER TABLE `category` ADD UNIQUE INDEX `uid_category_name_8b0cb9` (`name`)"
-        )
+        assert index_u == "ALTER TABLE `category` ADD UNIQUE INDEX `name` (`name`)"
     elif isinstance(Migrate.ddl, PostgresDDL):
         assert index == 'CREATE INDEX "idx_category_name_8b0cb9" ON "category" ("name")'
         assert index_u == 'CREATE UNIQUE INDEX "uid_category_name_8b0cb9" ON "category" ("name")'
@@ -169,7 +170,7 @@ def test_drop_index():
     ret_u = Migrate.ddl.drop_index(Category, ["name"], True)
     if isinstance(Migrate.ddl, MysqlDDL):
         assert ret == "ALTER TABLE `category` DROP INDEX `idx_category_name_8b0cb9`"
-        assert ret_u == "ALTER TABLE `category` DROP INDEX `uid_category_name_8b0cb9`"
+        assert ret_u == "ALTER TABLE `category` DROP INDEX `name`"
     elif isinstance(Migrate.ddl, PostgresDDL):
         assert ret == 'DROP INDEX "idx_category_name_8b0cb9"'
         assert ret_u == 'DROP INDEX "uid_category_name_8b0cb9"'

tests/test_migrate.py

@@ -1,11 +1,15 @@
+from pathlib import Path
+from typing import List, cast
+
 import pytest
+import tortoise
 from pytest_mock import MockerFixture
 
 from aerich.ddl.mysql import MysqlDDL
 from aerich.ddl.postgres import PostgresDDL
 from aerich.ddl.sqlite import SqliteDDL
 from aerich.exceptions import NotSupportError
-from aerich.migrate import Migrate
+from aerich.migrate import MIGRATE_TEMPLATE, Migrate
 from aerich.utils import get_models_describe
 
 old_models_describe = {
@@ -100,6 +104,21 @@ old_models_describe = {
                 "constraints": {"ge": 1, "le": 2147483647},
                 "db_field_types": {"": "INT"},
             },
+            {
+                "name": "title",
+                "field_type": "CharField",
+                "db_column": "title",
+                "python_type": "str",
+                "generated": False,
+                "nullable": False,
+                "unique": True,
+                "indexed": True,
+                "default": None,
+                "description": None,
+                "docstring": None,
+                "constraints": {"max_length": 20},
+                "db_field_types": {"": "VARCHAR(20)"},
+            },
         ],
         "fk_fields": [
             {
@@ -169,6 +188,21 @@ old_models_describe = {
             "db_field_types": {"": "INT"},
         },
         "data_fields": [
+            {
+                "name": "name",
+                "field_type": "CharField",
+                "db_column": "name",
+                "python_type": "str",
+                "generated": False,
+                "nullable": False,
+                "unique": True,
+                "indexed": True,
+                "default": None,
+                "description": None,
+                "docstring": None,
+                "constraints": {"max_length": 100},
+                "db_field_types": {"": "VARCHAR(100)"},
+            },
             {
                 "name": "label",
                 "field_type": "CharField",
@@ -369,6 +403,21 @@ old_models_describe = {
                 "constraints": {"max_length": 50},
                 "db_field_types": {"": "VARCHAR(50)"},
             },
+            {
+                "name": "uid",
+                "field_type": "IntField",
+                "db_column": "uuid",
+                "python_type": "int",
+                "generated": False,
+                "nullable": False,
+                "unique": True,
+                "indexed": True,
+                "default": None,
+                "description": None,
+                "docstring": None,
+                "constraints": {"ge": -2147483648, "le": 2147483647},
+                "db_field_types": {"": "INT"},
+            },
             {
                 "name": "view_num",
                 "field_type": "IntField",
@@ -773,6 +822,16 @@ old_models_describe = {
 }
 
 
+def should_add_user_id_column_type_alter_sql() -> bool:
+    if tortoise.__version__ < "0.21":
+        return False
+    # tortoise-orm>=0.21 changes IntField constraints
+    # from {"ge": 1, "le": 2147483647} to {"ge": -2147483648,"le": 2147483647}
+    data_fields = cast(List[dict], old_models_describe["models.Category"]["data_fields"])
+    user_id_constraints = data_fields[-1]["constraints"]
+    return tortoise.fields.data.IntField.constraints != user_id_constraints
+
+
 def test_migrate(mocker: MockerFixture):
     """
     models.py diff with old_models.py
@@ -783,28 +842,36 @@ def test_migrate(mocker: MockerFixture):
     - drop field: User.avatar
     - add index: Email.email
     - add many to many: Email.users
-    - remove unique: User.username
+    - remove unique: Category.title
+    - add unique: User.username
     - change column: length User.password
     - add unique_together: (name,type) of Product
+    - drop unique field: Config.name
     - alter default: Config.status
     - rename column: Product.image -> Product.pic
     """
-    mocker.patch("click.prompt", side_effect=(True,))
+    mocker.patch("asyncclick.prompt", side_effect=(True,))
 
     models_describe = get_models_describe("models")
     Migrate.app = "models"
     if isinstance(Migrate.ddl, SqliteDDL):
         with pytest.raises(NotSupportError):
             Migrate.diff_models(old_models_describe, models_describe)
+        Migrate.upgrade_operators.clear()
+        with pytest.raises(NotSupportError):
             Migrate.diff_models(models_describe, old_models_describe, False)
+        Migrate.downgrade_operators.clear()
     else:
         Migrate.diff_models(old_models_describe, models_describe)
         Migrate.diff_models(models_describe, old_models_describe, False)
-    Migrate._merge_operators()
+        Migrate._merge_operators()
     if isinstance(Migrate.ddl, MysqlDDL):
         expected_upgrade_operators = {
             "ALTER TABLE `category` MODIFY COLUMN `name` VARCHAR(200)",
             "ALTER TABLE `category` MODIFY COLUMN `slug` VARCHAR(100) NOT NULL",
+            "ALTER TABLE `category` DROP INDEX `title`",
+            "ALTER TABLE `config` DROP COLUMN `name`",
+            "ALTER TABLE `config` DROP INDEX `name`",
             "ALTER TABLE `config` ADD `user_id` INT NOT NULL  COMMENT 'User'",
             "ALTER TABLE `config` ADD CONSTRAINT `fk_config_user_17daa970` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE",
             "ALTER TABLE `config` ALTER COLUMN `status` DROP DEFAULT",
@@ -812,6 +879,8 @@ def test_migrate(mocker: MockerFixture):
             "ALTER TABLE `email` ADD `address` VARCHAR(200) NOT NULL",
             "ALTER TABLE `email` DROP COLUMN `user_id`",
             "ALTER TABLE `configs` RENAME TO `config`",
+            "ALTER TABLE `product` DROP COLUMN `uuid`",
+            "ALTER TABLE `product` DROP INDEX `uuid`",
             "ALTER TABLE `product` RENAME COLUMN `image` TO `pic`",
             "ALTER TABLE `email` RENAME COLUMN `id` TO `email_id`",
             "ALTER TABLE `product` ADD INDEX `idx_product_name_869427` (`name`, `type_db_alias`)",
@@ -827,7 +896,7 @@ def test_migrate(mocker: MockerFixture):
             "ALTER TABLE `user` MODIFY COLUMN `is_active` BOOL NOT NULL  COMMENT 'Is Active' DEFAULT 1",
             "ALTER TABLE `user` MODIFY COLUMN `is_superuser` BOOL NOT NULL  COMMENT 'Is SuperUser' DEFAULT 0",
             "ALTER TABLE `user` MODIFY COLUMN `longitude` DECIMAL(10,8) NOT NULL",
-            "ALTER TABLE `user` ADD UNIQUE INDEX `uid_user_usernam_9987ab` (`username`)",
+            "ALTER TABLE `user` ADD UNIQUE INDEX `username` (`username`)",
             "CREATE TABLE `email_user` (\n    `email_id` INT NOT NULL REFERENCES `email` (`email_id`) ON DELETE CASCADE,\n    `user_id` INT NOT NULL REFERENCES `user` (`id`) ON DELETE CASCADE\n) CHARACTER SET utf8mb4",
             "CREATE TABLE IF NOT EXISTS `newmodel` (\n    `id` INT NOT NULL PRIMARY KEY AUTO_INCREMENT,\n    `name` VARCHAR(50) NOT NULL\n) CHARACTER SET utf8mb4",
             "ALTER TABLE `category` MODIFY COLUMN `created_at` DATETIME(6) NOT NULL  DEFAULT CURRENT_TIMESTAMP(6)",
@@ -837,6 +906,9 @@ def test_migrate(mocker: MockerFixture):
         expected_downgrade_operators = {
             "ALTER TABLE `category` MODIFY COLUMN `name` VARCHAR(200) NOT NULL",
             "ALTER TABLE `category` MODIFY COLUMN `slug` VARCHAR(200) NOT NULL",
+            "ALTER TABLE `category` ADD UNIQUE INDEX `title` (`title`)",
+            "ALTER TABLE `config` ADD `name` VARCHAR(100) NOT NULL UNIQUE",
+            "ALTER TABLE `config` ADD UNIQUE INDEX `name` (`name`)",
             "ALTER TABLE `config` DROP COLUMN `user_id`",
             "ALTER TABLE `config` DROP FOREIGN KEY `fk_config_user_17daa970`",
             "ALTER TABLE `config` ALTER COLUMN `status` SET DEFAULT 1",
@@ -845,12 +917,14 @@ def test_migrate(mocker: MockerFixture):
             "ALTER TABLE `config` RENAME TO `configs`",
             "ALTER TABLE `product` RENAME COLUMN `pic` TO `image`",
             "ALTER TABLE `email` RENAME COLUMN `email_id` TO `id`",
+            "ALTER TABLE `product` ADD `uuid` INT NOT NULL UNIQUE",
+            "ALTER TABLE `product` ADD UNIQUE INDEX `uuid` (`uuid`)",
             "ALTER TABLE `product` DROP INDEX `idx_product_name_869427`",
             "ALTER TABLE `email` DROP INDEX `idx_email_email_4a1a33`",
             "ALTER TABLE `product` DROP INDEX `uid_product_name_869427`",
             "ALTER TABLE `product` ALTER COLUMN `view_num` DROP DEFAULT",
             "ALTER TABLE `user` ADD `avatar` VARCHAR(200) NOT NULL  DEFAULT ''",
-            "ALTER TABLE `user` DROP INDEX `idx_user_usernam_9987ab`",
+            "ALTER TABLE `user` DROP INDEX `username`",
             "ALTER TABLE `user` MODIFY COLUMN `password` VARCHAR(200) NOT NULL",
             "DROP TABLE IF EXISTS `email_user`",
             "DROP TABLE IF EXISTS `newmodel`",
@@ -866,6 +940,10 @@ def test_migrate(mocker: MockerFixture):
             "ALTER TABLE `product` MODIFY COLUMN `body` LONGTEXT NOT NULL",
             "ALTER TABLE `email` MODIFY COLUMN `is_primary` BOOL NOT NULL  DEFAULT 0",
         }
+        if should_add_user_id_column_type_alter_sql():
+            sql = "ALTER TABLE `category` MODIFY COLUMN `user_id` INT NOT NULL  COMMENT 'User'"
+            expected_upgrade_operators.add(sql)
+            expected_downgrade_operators.add(sql)
         assert not set(Migrate.upgrade_operators).symmetric_difference(expected_upgrade_operators)
 
         assert not set(Migrate.downgrade_operators).symmetric_difference(
@@ -874,9 +952,12 @@ def test_migrate(mocker: MockerFixture):
 
     elif isinstance(Migrate.ddl, PostgresDDL):
         expected_upgrade_operators = {
+            'DROP INDEX "uid_category_title_f7fc03"',
             'ALTER TABLE "category" ALTER COLUMN "name" DROP NOT NULL',
             'ALTER TABLE "category" ALTER COLUMN "slug" TYPE VARCHAR(100) USING "slug"::VARCHAR(100)',
             'ALTER TABLE "category" ALTER COLUMN "created_at" TYPE TIMESTAMPTZ USING "created_at"::TIMESTAMPTZ',
+            'ALTER TABLE "config" DROP COLUMN "name"',
+            'DROP INDEX "uid_config_name_2c83c8"',
             'ALTER TABLE "config" ADD "user_id" INT NOT NULL',
             'ALTER TABLE "config" ADD CONSTRAINT "fk_config_user_17daa970" FOREIGN KEY ("user_id") REFERENCES "user" ("id") ON DELETE CASCADE',
             'ALTER TABLE "config" ALTER COLUMN "status" DROP DEFAULT',
@@ -886,6 +967,8 @@ def test_migrate(mocker: MockerFixture):
             'ALTER TABLE "email" DROP COLUMN "user_id"',
             'ALTER TABLE "email" RENAME COLUMN "id" TO "email_id"',
             'ALTER TABLE "email" ALTER COLUMN "is_primary" TYPE BOOL USING "is_primary"::BOOL',
+            'DROP INDEX "uid_product_uuid_d33c18"',
+            'ALTER TABLE "product" DROP COLUMN "uuid"',
             'ALTER TABLE "product" ALTER COLUMN "view_num" SET DEFAULT 0',
             'ALTER TABLE "product" RENAME COLUMN "image" TO "pic"',
             'ALTER TABLE "product" ALTER COLUMN "is_reviewed" TYPE BOOL USING "is_reviewed"::BOOL',
@@ -906,9 +989,12 @@ def test_migrate(mocker: MockerFixture):
             'CREATE UNIQUE INDEX "uid_user_usernam_9987ab" ON "user" ("username")',
         }
         expected_downgrade_operators = {
+            'CREATE UNIQUE INDEX "uid_category_title_f7fc03" ON "category" ("title")',
             'ALTER TABLE "category" ALTER COLUMN "name" SET NOT NULL',
             'ALTER TABLE "category" ALTER COLUMN "slug" TYPE VARCHAR(200) USING "slug"::VARCHAR(200)',
             'ALTER TABLE "category" ALTER COLUMN "created_at" TYPE TIMESTAMPTZ USING "created_at"::TIMESTAMPTZ',
+            'ALTER TABLE "config" ADD "name" VARCHAR(100) NOT NULL UNIQUE',
+            'CREATE UNIQUE INDEX "uid_config_name_2c83c8" ON "config" ("name")',
             'ALTER TABLE "config" ALTER COLUMN "status" SET DEFAULT 1',
             'ALTER TABLE "config" DROP COLUMN "user_id"',
             'ALTER TABLE "config" DROP CONSTRAINT "fk_config_user_17daa970"',
@@ -918,6 +1004,8 @@ def test_migrate(mocker: MockerFixture):
             'ALTER TABLE "email" DROP COLUMN "address"',
             'ALTER TABLE "email" RENAME COLUMN "email_id" TO "id"',
             'ALTER TABLE "email" ALTER COLUMN "is_primary" TYPE BOOL USING "is_primary"::BOOL',
+            'ALTER TABLE "product" ADD "uuid" INT NOT NULL UNIQUE',
+            'CREATE UNIQUE INDEX "uid_product_uuid_d33c18" ON "product" ("uuid")',
             'ALTER TABLE "product" ALTER COLUMN "view_num" DROP DEFAULT',
             'ALTER TABLE "product" RENAME COLUMN "pic" TO "image"',
             'ALTER TABLE "user" ADD "avatar" VARCHAR(200) NOT NULL  DEFAULT \'\'',
@@ -932,11 +1020,15 @@ def test_migrate(mocker: MockerFixture):
             'ALTER TABLE "product" ALTER COLUMN "body" TYPE TEXT USING "body"::TEXT',
             'DROP INDEX "idx_product_name_869427"',
             'DROP INDEX "idx_email_email_4a1a33"',
-            'DROP INDEX "idx_user_usernam_9987ab"',
+            'DROP INDEX "uid_user_usernam_9987ab"',
             'DROP INDEX "uid_product_name_869427"',
             'DROP TABLE IF EXISTS "email_user"',
             'DROP TABLE IF EXISTS "newmodel"',
         }
+        if should_add_user_id_column_type_alter_sql():
+            sql = 'ALTER TABLE "category" ALTER COLUMN "user_id" TYPE INT USING "user_id"::INT'
+            expected_upgrade_operators.add(sql)
+            expected_downgrade_operators.add(sql)
         assert not set(Migrate.upgrade_operators).symmetric_difference(expected_upgrade_operators)
         assert not set(Migrate.downgrade_operators).symmetric_difference(
             expected_downgrade_operators
@@ -966,3 +1058,15 @@ def test_sort_all_version_files(mocker):
         "10_datetime_update.py",
         "11_datetime_update.py",
     ]
+
+
+async def test_empty_migration(mocker, tmp_path: Path) -> None:
+    mocker.patch("os.listdir", return_value=[])
+    Migrate.app = "foo"
+    expected_content = MIGRATE_TEMPLATE.format(upgrade_sql="", downgrade_sql="")
+    Migrate.migrate_location = tmp_path
+
+    migration_file = await Migrate.migrate("update", True)
+
+    f = tmp_path / migration_file
+    assert f.read_text() == expected_content

tests/test_utils.py

@@ -1,6 +1,6 @@
 from aerich.utils import import_py_file
 
 
-def test_import_py_file():
+def test_import_py_file() -> None:
     m = import_py_file("aerich/utils.py")
     assert getattr(m, "import_py_file")