complete InspectDb

Use `pathlib` for path resolving

.github/workflows/pypi.yml

@@ -11,11 +11,14 @@ jobs:
       - uses: actions/setup-python@v2
         with:
           python-version: '3.x'
-      - uses: dschep/install-poetry-action@v1.3
+      - name: Install and configure Poetry
+        uses: snok/install-poetry@v1.1.1
+        with:
+          virtualenvs-create: false
       - name: Build dists
         run: make build
       - name: Pypi Publish
         uses: pypa/gh-action-pypi-publish@master
         with:
           user: __token__
-          password: ${{ secrets.pypi_password }}
+          password: ${{ secrets.pypi_password }}

.github/workflows/test.yml

@@ -1,5 +1,5 @@
 name: test
-on: [push, pull_request]
+on: [ push, pull_request ]
 jobs:
   testall:
     runs-on: ubuntu-latest
@@ -19,7 +19,10 @@ jobs:
       - uses: actions/setup-python@v2
         with:
           python-version: '3.x'
-      - uses: dschep/install-poetry-action@v1.3
+      - name: Install and configure Poetry
+        uses: snok/install-poetry@v1.1.1
+        with:
+          virtualenvs-create: false
       - name: CI
         env:
           MYSQL_PASS: root
@@ -28,4 +31,4 @@ jobs:
           POSTGRES_PASS: 123456
           POSTGRES_HOST: 127.0.0.1
           POSTGRES_PORT: 5432
-        run: make ci
+        run: make ci

.gitignore

@@ -143,4 +143,6 @@ cython_debug/
 .idea
 migrations
 aerich.ini
-src
+src
+.vscode
+.DS_Store

CHANGELOG.md

@@ -1,16 +1,55 @@
 # ChangeLog
 
+## 0.4
+
+### 0.4.3
+
+- Replace migrations separator to sql standard comment.
+- Add `inspectdb` command.
+
+### 0.4.2
+
+- Use `pathlib` for path resolving. (#89)
+- Fix upgrade in new db. (#96)
+- Fix packaging error. (#92)
+
+### 0.4.1
+
+- Bug fix. (#91 #93)
+
+### 0.4.0
+
+- Use `.sql` instead of `.json` to store version file.
+- Add `rename` column support MySQL5.
+- Remove callable detection for defaults. (#87)
+- Fix `sqlite` stuck. (#90)
+
 ## 0.3
 
+### 0.3.3
+
+- Fix encoding error. (#75)
+- Support multiple databases. (#68)
+- Compatible with models file in directory. (#70)
+
+### 0.3.2
+
+- Fix migrate to new database error. (#62)
+
+### 0.3.1
+
+- Fix first version error.
+- Fix init error. (#61)
+
 ### 0.3.0
 
 - Refactoring migrate logic, and this version is not compatible with previous version.
 - Now there don't need `old_models.py` and it store in database.
 - Upgrade steps:
-  1. Upgrade aerich version.
+    1. Upgrade aerich version.
-  2. Drop aerich model in db and recreate with new struct.
+    2. Drop aerich table in database.
-  3. Delete `migrations/{app}` folder and rerun `aerich init-db`.
+    3. Delete `migrations/{app}` folder and rerun `aerich init-db`.
-  4. Update model and `aerich migrate` normally.
+    4. Update model and `aerich migrate` normally.
 
 ## 0.2
 

Makefile

@@ -3,8 +3,10 @@ black_opts = -l 100 -t py38
 py_warn = PYTHONDEVMODE=1
 MYSQL_HOST ?= "127.0.0.1"
 MYSQL_PORT ?= 3306
+MYSQL_PASS ?= "123456"
 POSTGRES_HOST ?= "127.0.0.1"
 POSTGRES_PORT ?= 5432
+POSTGRES_PASS ?= "123456"
 
 help:
 	@echo "Aerich development makefile"
@@ -22,7 +24,7 @@ up:
 	@poetry update
 
 deps:
-	@poetry install -E dbdrivers --no-root
+	@poetry install -E dbdrivers
 
 style: deps
 	isort -src $(checkfiles)

README.md

@@ -7,8 +7,10 @@
 
 ## Introduction
 
-Aerich is a database migrations tool for Tortoise-ORM, which like alembic for SQLAlchemy, or Django ORM with it\'s
+Aerich is a database migrations tool for Tortoise-ORM, which like alembic for SQLAlchemy, or Django ORM with it\'s own
-own migrations solution.
+migrations solution.
+
+**Important: You can only use absolutely import in your `models.py` to make `aerich` work.**
 
 ## Install
 
@@ -33,19 +35,19 @@ Options:
   -h, --help         Show this message and exit.
 
 Commands:
-  downgrade  Downgrade to previous version.
+  downgrade  Downgrade to specified version.
   heads      Show current available heads in migrate location.
   history    List all migrate items.
   init       Init config file and generate root migrate location.
   init-db    Generate schema and generate app migrate location.
+  inspectdb  Introspects the database tables to standard output as...
   migrate    Generate migrate changes file.
   upgrade    Upgrade to latest version.
 ```
 
 ## Usage
 
-You need add `aerich.models` to your `Tortoise-ORM` config first,
+You need add `aerich.models` to your `Tortoise-ORM` config first, example:
-example:
 
 ```python
 TORTOISE_ORM = {
@@ -101,22 +103,21 @@ If your Tortoise-ORM app is not default `models`, you must specify
 ```shell
 > aerich migrate --name drop_column
 
-Success migrate 1_202029051520102929_drop_column.json
+Success migrate 1_202029051520102929_drop_column.sql
 ```
 
 Format of migrate filename is
-`{version_num}_{datetime}_{name|update}.json`.
+`{version_num}_{datetime}_{name|update}.sql`.
 
-And if `aerich` guess you are renaming a column, it will ask `Rename {old_column} to {new_column} [True]`, you can choice `True` to rename column without column drop, or choice `False` to drop column then create.
+And if `aerich` guess you are renaming a column, it will ask `Rename {old_column} to {new_column} [True]`, you can
-
+choice `True` to rename column without column drop, or choice `False` to drop column then create.
-If you use `MySQL`, only MySQL8.0+ support `rename..to` syntax.
 
 ### Upgrade to latest version
 
 ```shell
 > aerich upgrade
 
-Success upgrade 1_202029051520102929_drop_column.json
+Success upgrade 1_202029051520102929_drop_column.sql
 ```
 
 Now your db is migrated to latest.
@@ -132,13 +133,17 @@ Usage: aerich downgrade [OPTIONS]
 
 Options:
   -v, --version INTEGER  Specified version, default to last.  [default: -1]
+  -d, --delete           Delete version files at the same time.  [default:
+                         False]
+
+  --yes                  Confirm the action without prompting.
   -h, --help             Show this message and exit.
 ```
 
 ```shell
 > aerich downgrade
 
-Success downgrade 1_202029051520102929_drop_column.json
+Success downgrade 1_202029051520102929_drop_column.sql
 ```
 
 Now your db rollback to specified version.
@@ -148,7 +153,7 @@ Now your db rollback to specified version.
 ```shell
 > aerich history
 
-1_202029051520102929_drop_column.json
+1_202029051520102929_drop_column.sql
 ```
 
 ### Show heads to be migrated
@@ -156,13 +161,54 @@ Now your db rollback to specified version.
 ```shell
 > aerich heads
 
-1_202029051520102929_drop_column.json
+1_202029051520102929_drop_column.sql
 ```
 
-## Support this project
+### Inspect db tables to TortoiseORM model
 
-- Just give a star!
+```shell
-- Donation.
+Usage: aerich inspectdb [OPTIONS]
+
+  Introspects the database tables to standard output as TortoiseORM model.
+
+Options:
+  -t, --table TEXT  Which tables to inspect.
+  -h, --help        Show this message and exit.
+```
+
+Inspect all tables and print to console:
+
+```shell
+aerich --app models inspectdb -t user 
+```
+
+Inspect a specified table in default app and redirect to `models.py`:
+
+```shell
+aerich inspectdb -t user > models.py
+```
+
+Note that this command is restricted, which is not supported in some solutions, such as `IntEnumField`
+and `ForeignKeyField` and so on.
+
+### Multiple databases
+
+```python
+tortoise_orm = {
+    "connections": {
+        "default": expand_db_url(db_url, True),
+        "second": expand_db_url(db_url_second, True),
+    },
+    "apps": {
+        "models": {"models": ["tests.models", "aerich.models"], "default_connection": "default"},
+        "models_second": {"models": ["tests.models_second"], "default_connection": "second", },
+    },
+}
+```
+
+You need only specify `aerich.models` in one app, and must specify `--app` when run `aerich migrate` and so on.
+
+## Support this project
 
 | AliPay                                                                                 | WeChatPay                                                                                 | PayPal                                                           |
 | -------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- | ---------------------------------------------------------------- |

aerich/__init__.py

@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.3"

aerich/cli.py

@@ -1,9 +1,10 @@
 import asyncio
-import json
 import os
 import sys
 from configparser import ConfigParser
 from functools import wraps
+from pathlib import Path
+from typing import List
 
 import click
 from click import Context, UsageError
@@ -12,8 +13,15 @@ from tortoise.exceptions import OperationalError
 from tortoise.transactions import in_transaction
 from tortoise.utils import get_schema_sql
 
+from aerich.inspectdb import InspectDb
 from aerich.migrate import Migrate
-from aerich.utils import get_app_connection, get_app_connection_name, get_tortoise_config
+from aerich.utils import (
+    get_app_connection,
+    get_app_connection_name,
+    get_tortoise_config,
+    get_version_content_from_file,
+    write_version_file,
+)
 
 from . import __version__
 from .enums import Color
@@ -28,7 +36,9 @@ def coro(f):
         loop = asyncio.get_event_loop()
         ctx = args[0]
         loop.run_until_complete(f(*args, **kwargs))
-        Migrate.remove_old_model_file(ctx.obj["app"], ctx.obj["location"])
+        app = ctx.obj.get("app")
+        if app:
+            Migrate.remove_old_model_file(app, ctx.obj["location"])
 
     return wrapper
 
@@ -36,7 +46,11 @@ def coro(f):
 @click.group(context_settings={"help_option_names": ["-h", "--help"]})
 @click.version_option(__version__, "-V", "--version")
 @click.option(
-    "-c", "--config", default="aerich.ini", show_default=True, help="Config file.",
+    "-c",
+    "--config",
+    default="aerich.ini",
+    show_default=True,
+    help="Config file.",
 )
 @click.option("--app", required=False, help="Tortoise-ORM app name.")
 @click.option(
@@ -55,7 +69,7 @@ async def cli(ctx: Context, config, app, name):
 
     invoked_subcommand = ctx.invoked_subcommand
     if invoked_subcommand != "init":
-        if not os.path.exists(config):
+        if not Path(config).exists():
             raise UsageError("You must exec init first", ctx=ctx)
         parser.read(config)
 
@@ -64,13 +78,13 @@ async def cli(ctx: Context, config, app, name):
 
         tortoise_config = get_tortoise_config(ctx, tortoise_orm)
         app = app or list(tortoise_config.get("apps").keys())[0]
-        if "aerich.models" not in tortoise_config.get("apps").get(app).get("models"):
-            raise UsageError("Check your tortoise config and add aerich.models to it.", ctx=ctx)
         ctx.obj["config"] = tortoise_config
         ctx.obj["location"] = location
         ctx.obj["app"] = app
         Migrate.app = app
         if invoked_subcommand != "init-db":
+            if not Path(location, app).exists():
+                raise UsageError("You must exec init-db first", ctx=ctx)
             await Migrate.init_with_old_models(tortoise_config, app, location)
 
 
@@ -100,12 +114,11 @@ async def upgrade(ctx: Context):
             exists = False
         if not exists:
             async with in_transaction(get_app_connection_name(config, app)) as conn:
-                file_path = os.path.join(Migrate.migrate_location, version_file)
+                file_path = Path(Migrate.migrate_location, version_file)
-                with open(file_path, "r", encoding="utf-8") as f:
+                content = get_version_content_from_file(file_path)
-                    content = json.load(f)
+                upgrade_query_list = content.get("upgrade")
-                    upgrade_query_list = content.get("upgrade")
+                for upgrade_query in upgrade_query_list:
-                    for upgrade_query in upgrade_query_list:
+                    await conn.execute_script(upgrade_query)
-                        await conn.execute_script(upgrade_query)
                 await Aerich.create(
                     version=version_file,
                     app=app,
@@ -114,7 +127,7 @@ async def upgrade(ctx: Context):
             click.secho(f"Success upgrade {version_file}", fg=Color.green)
             migrated = True
     if not migrated:
-        click.secho("No migrate items", fg=Color.yellow)
+        click.secho("No upgrade items found", fg=Color.yellow)
 
 
 @cli.command(help="Downgrade to specified version.")
@@ -126,9 +139,20 @@ async def upgrade(ctx: Context):
     show_default=True,
     help="Specified version, default to last.",
 )
+@click.option(
+    "-d",
+    "--delete",
+    is_flag=True,
+    default=False,
+    show_default=True,
+    help="Delete version files at the same time.",
+)
 @click.pass_context
+@click.confirmation_option(
+    prompt="Downgrade is dangerous, which maybe lose your data, are you sure?",
+)
 @coro
-async def downgrade(ctx: Context, version: int):
+async def downgrade(ctx: Context, version: int, delete: bool):
     app = ctx.obj["app"]
     config = ctx.obj["config"]
     if version == -1:
@@ -144,16 +168,17 @@ async def downgrade(ctx: Context, version: int):
     for version in versions:
         file = version.version
         async with in_transaction(get_app_connection_name(config, app)) as conn:
-            file_path = os.path.join(Migrate.migrate_location, file)
+            file_path = Path(Migrate.migrate_location, file)
-            with open(file_path, "r", encoding="utf-8") as f:
+            content = get_version_content_from_file(file_path)
-                content = json.load(f)
+            downgrade_query_list = content.get("downgrade")
-                downgrade_query_list = content.get("downgrade")
+            if not downgrade_query_list:
-                if not downgrade_query_list:
+                click.secho("No downgrade items found", fg=Color.yellow)
-                    return click.secho("No downgrade item found", fg=Color.yellow)
+                return
-                for downgrade_query in downgrade_query_list:
+            for downgrade_query in downgrade_query_list:
-                    await conn.execute_query(downgrade_query)
+                await conn.execute_query(downgrade_query)
-                await version.delete()
+            await version.delete()
-            os.unlink(file_path)
+            if delete:
+                os.unlink(file_path)
             click.secho(f"Success downgrade {file}", fg=Color.green)
 
 
@@ -191,16 +216,21 @@ async def history(ctx: Context):
     help="Tortoise-ORM config module dict variable, like settings.TORTOISE_ORM.",
 )
 @click.option(
-    "--location", default="./migrations", show_default=True, help="Migrate store location."
+    "--location",
+    default="./migrations",
+    show_default=True,
+    help="Migrate store location.",
 )
 @click.pass_context
 @coro
 async def init(
-    ctx: Context, tortoise_orm, location,
+    ctx: Context,
+    tortoise_orm,
+    location,
 ):
     config_file = ctx.obj["config_file"]
     name = ctx.obj["name"]
-    if os.path.exists(config_file):
+    if Path(config_file).exists():
         return click.secho("You have inited", fg=Color.yellow)
 
     parser.add_section(name)
@@ -210,7 +240,7 @@ async def init(
     with open(config_file, "w", encoding="utf-8") as f:
         parser.write(f)
 
-    if not os.path.isdir(location):
+    if not Path(location).is_dir():
         os.mkdir(location)
 
     click.secho(f"Success create migrate location {location}", fg=Color.green)
@@ -232,12 +262,14 @@ async def init_db(ctx: Context, safe):
     location = ctx.obj["location"]
     app = ctx.obj["app"]
 
-    dirname = os.path.join(location, app)
+    dirname = Path(location, app)
-    if not os.path.isdir(dirname):
+    if not dirname.is_dir():
         os.mkdir(dirname)
         click.secho(f"Success create app migrate location {dirname}", fg=Color.green)
     else:
-        return click.secho(f"Inited {app} already", fg=Color.yellow)
+        return click.secho(
+            f"Inited {app} already, or delete {dirname} and try again.", fg=Color.yellow
+        )
 
     await Tortoise.init(config=config)
     connection = get_app_connection(config, app)
@@ -247,16 +279,40 @@ async def init_db(ctx: Context, safe):
 
     version = await Migrate.generate_version()
     await Aerich.create(
-        version=version, app=app, content=Migrate.get_models_content(config, app, location)
+        version=version,
+        app=app,
+        content=Migrate.get_models_content(config, app, location),
     )
-    with open(os.path.join(dirname, version), "w", encoding="utf-8") as f:
+    content = {
-        content = {
+        "upgrade": [schema],
-            "upgrade": [schema],
+    }
-        }
+    write_version_file(Path(dirname, version), content)
-        json.dump(content, f, ensure_ascii=False, indent=2)
+    click.secho(f'Success generate schema for app "{app}"', fg=Color.green)
-    return click.secho(f'Success generate schema for app "{app}"', fg=Color.green)
+
+
+@cli.command(help="Introspects the database tables to standard output as TortoiseORM model.")
+@click.option(
+    "-t",
+    "--table",
+    help="Which tables to inspect.",
+    multiple=True,
+    required=False,
+)
+@click.pass_context
+@coro
+async def inspectdb(ctx: Context, table: List[str]):
+    config = ctx.obj["config"]
+    app = ctx.obj["app"]
+    connection = get_app_connection(config, app)
+
+    inspect = InspectDb(connection, table)
+    await inspect.inspect()
 
 
 def main():
     sys.path.insert(0, ".")
     cli()
+
+
+if __name__ == "__main__":
+    main()

aerich/ddl/__init__.py

@@ -22,6 +22,9 @@ class BaseDDL:
     _DROP_FK_TEMPLATE = 'ALTER TABLE "{table_name}" DROP FOREIGN KEY "{fk_name}"'
     _M2M_TABLE_TEMPLATE = 'CREATE TABLE "{table_name}" ("{backward_key}" {backward_type} NOT NULL REFERENCES "{backward_table}" ("{backward_field}") ON DELETE CASCADE,"{forward_key}" {forward_type} NOT NULL REFERENCES "{forward_table}" ("{forward_field}") ON DELETE {on_delete}){extra}{comment};'
     _MODIFY_COLUMN_TEMPLATE = 'ALTER TABLE "{table_name}" MODIFY COLUMN {column}'
+    _CHANGE_COLUMN_TEMPLATE = (
+        'ALTER TABLE "{table_name}" CHANGE {old_column_name} {new_column_name} {new_column_type}'
+    )
 
     def __init__(self, client: "BaseDBAsyncClient"):
         self.client = client
@@ -136,6 +139,16 @@ class BaseDDL:
             new_column_name=new_column_name,
         )
 
+    def change_column(
+        self, model: "Type[Model]", old_column_name: str, new_column_name: str, new_column_type: str
+    ):
+        return self._CHANGE_COLUMN_TEMPLATE.format(
+            table_name=model._meta.db_table,
+            old_column_name=old_column_name,
+            new_column_name=new_column_name,
+            new_column_type=new_column_type,
+        )
+
     def add_index(self, model: "Type[Model]", field_names: List[str], unique=False):
         return self._ADD_INDEX_TEMPLATE.format(
             unique="UNIQUE" if unique else "",

aerich/inspectdb.py

@@ -0,0 +1,86 @@
+import sys
+from typing import List, Optional
+
+from ddlparse import DdlParse
+from tortoise import BaseDBAsyncClient
+from tortoise.backends.mysql.client import MySQLSchemaGenerator
+
+
+class InspectDb:
+    _table_template = "class {table}(Model):\n"
+    _field_template_mapping = {
+        "INT": "    {field} = fields.IntField({pk}{unique}{comment})",
+        "SMALLINT": "    {field} = fields.IntField({pk}{unique}{comment})",
+        "TINYINT": "    {field} = fields.BooleanField({null}{default}{comment})",
+        "VARCHAR": "    {field} = fields.CharField({pk}{unique}{length}{null}{default}{comment})",
+        "LONGTEXT": "    {field} = fields.TextField({null}{default}{comment})",
+        "TEXT": "    {field} = fields.TextField({null}{default}{comment})",
+        "DATETIME": "    {field} = fields.DatetimeField({null}{default}{comment})",
+    }
+
+    def __init__(self, conn: BaseDBAsyncClient, tables: Optional[List[str]] = None):
+        self.conn = conn
+        self.tables = tables
+        self.DIALECT = conn.schema_generator.DIALECT
+
+    async def show_create_tables(self):
+        if self.DIALECT == MySQLSchemaGenerator.DIALECT:
+            if not self.tables:
+                sql_tables = f"SELECT table_name FROM information_schema.tables WHERE table_schema = '{self.conn.database}';"  # nosec: B608
+                ret = await self.conn.execute_query(sql_tables)
+                self.tables = map(lambda x: x["TABLE_NAME"], ret[1])
+            for table in self.tables:
+                sql_show_create_table = f"SHOW CREATE TABLE {table}"
+                ret = await self.conn.execute_query(sql_show_create_table)
+                yield ret[1][0]["Create Table"]
+        else:
+            raise NotImplementedError("Currently only support MySQL")
+
+    async def inspect(self):
+        ddl_list = self.show_create_tables()
+        result = "from tortoise import Model, fields\n\n\n"
+        tables = []
+        async for ddl in ddl_list:
+            parser = DdlParse(ddl, DdlParse.DATABASE.mysql)
+            table = parser.parse()
+            name = table.name.title()
+            columns = table.columns
+            fields = []
+            model = self._table_template.format(table=name)
+            for column_name, column in columns.items():
+                comment = default = length = unique = null = pk = ""
+                if column.primary_key:
+                    pk = "pk=True, "
+                if column.unique:
+                    unique = "unique=True, "
+                if column.data_type == "VARCHAR":
+                    length = f"max_length={column.length}, "
+                if not column.not_null:
+                    null = "null=True, "
+                if column.default is not None:
+                    if column.data_type == "TINYINT":
+                        default = f"default={'True' if column.default == '1' else 'False'}, "
+                    elif column.data_type == "DATETIME":
+                        if "CURRENT_TIMESTAMP" in column.default:
+                            if "ON UPDATE CURRENT_TIMESTAMP" in ddl:
+                                default = "auto_now_add=True, "
+                            else:
+                                default = "auto_now=True, "
+                    else:
+                        default = f"default={column.default}, "
+
+                if column.comment:
+                    comment = f"description='{column.comment}', "
+
+                field = self._field_template_mapping[column.data_type].format(
+                    field=column_name,
+                    pk=pk,
+                    unique=unique,
+                    length=length,
+                    null=null,
+                    default=default,
+                    comment=comment,
+                )
+                fields.append(field)
+            tables.append(model + "\n".join(fields))
+        sys.stdout.write(result + "\n\n\n".join(tables))

aerich/migrate.py

@@ -1,25 +1,28 @@
-import json
+import inspect
 import os
 import re
 from datetime import datetime
 from importlib import import_module
 from io import StringIO
-from typing import Dict, List, Tuple, Type
+from pathlib import Path
+from typing import Dict, List, Optional, Tuple, Type
 
 import click
 from tortoise import (
     BackwardFKRelation,
     BackwardOneToOneRelation,
+    BaseDBAsyncClient,
     ForeignKeyFieldInstance,
     ManyToManyFieldInstance,
     Model,
     Tortoise,
 )
+from tortoise.exceptions import OperationalError
 from tortoise.fields import Field
 
 from aerich.ddl import BaseDDL
 from aerich.models import MAX_VERSION_LENGTH, Aerich
-from aerich.utils import get_app_connection
+from aerich.utils import get_app_connection, write_version_file
 
 
 class Migrate:
@@ -40,43 +43,54 @@ class Migrate:
     app: str
     migrate_location: str
     dialect: str
+    _db_version: Optional[str] = None
 
     @classmethod
     def get_old_model_file(cls, app: str, location: str):
-        return os.path.join(location, app, cls.old_models + ".py")
+        return Path(location, app, cls.old_models + ".py")
 
     @classmethod
     def get_all_version_files(cls) -> List[str]:
         return sorted(
-            filter(lambda x: x.endswith("json"), os.listdir(cls.migrate_location)),
+            filter(lambda x: x.endswith("sql"), os.listdir(cls.migrate_location)),
             key=lambda x: int(x.split("_")[0]),
         )
 
     @classmethod
-    async def get_last_version(cls) -> Aerich:
+    async def get_last_version(cls) -> Optional[Aerich]:
-        return await Aerich.filter(app=cls.app).first()
+        try:
+            return await Aerich.filter(app=cls.app).first()
+        except OperationalError:
+            pass
 
     @classmethod
     def remove_old_model_file(cls, app: str, location: str):
         try:
             os.unlink(cls.get_old_model_file(app, location))
-        except FileNotFoundError:
+        except (OSError, FileNotFoundError):
             pass
 
+    @classmethod
+    async def _get_db_version(cls, connection: BaseDBAsyncClient):
+        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 init_with_old_models(cls, config: dict, app: str, location: str):
         await Tortoise.init(config=config)
         last_version = await cls.get_last_version()
-        content = last_version.content
-        with open(cls.get_old_model_file(app, location), "w") as f:
-            f.write(content)
-
-        migrate_config = cls._get_migrate_config(config, app, location)
         cls.app = app
-        cls.migrate_config = migrate_config
+        cls.migrate_location = Path(location, app)
-        cls.migrate_location = os.path.join(location, app)
+        if last_version:
+            content = last_version.content
+            with open(cls.get_old_model_file(app, location), "w", encoding="utf-8") as f:
+                f.write(content)
 
-        await Tortoise.init(config=migrate_config)
+            migrate_config = cls._get_migrate_config(config, app, location)
+            cls.migrate_config = migrate_config
+            await Tortoise.init(config=migrate_config)
 
         connection = get_app_connection(config, app)
         cls.dialect = connection.schema_generator.DIALECT
@@ -92,6 +106,7 @@ class Migrate:
             from aerich.ddl.postgres import PostgresDDL
 
             cls.ddl = PostgresDDL(connection)
+        await cls._get_db_version(connection)
 
     @classmethod
     async def _get_last_version_num(cls):
@@ -106,8 +121,8 @@ class Migrate:
         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:
-            return f"0_{now}_init.json"
+            return f"0_{now}_init.sql"
-        version = f"{last_version_num + 1}_{now}_{name}.json"
+        version = f"{last_version_num + 1}_{now}_{name}.sql"
         if len(version) > MAX_VERSION_LENGTH:
             raise ValueError(f"Version name exceeds maximum length ({MAX_VERSION_LENGTH})")
         return version
@@ -118,13 +133,12 @@ class Migrate:
         # delete if same version exists
         for version_file in cls.get_all_version_files():
             if version_file.startswith(version.split("_")[0]):
-                os.unlink(os.path.join(cls.migrate_location, version_file))
+                os.unlink(Path(cls.migrate_location, version_file))
         content = {
             "upgrade": cls.upgrade_operators,
             "downgrade": cls.downgrade_operators,
         }
-        with open(os.path.join(cls.migrate_location, version), "w", encoding="utf-8") as f:
+        write_version_file(Path(cls.migrate_location, version), content)
-            json.dump(content, f, indent=2, ensure_ascii=False)
         return version
 
     @classmethod
@@ -177,8 +191,7 @@ class Migrate:
         :param location:
         :return:
         """
-        path = os.path.join(location, app, cls.old_models)
+        path = Path(location, app, cls.old_models).as_posix().replace("/", ".")
-        path = path.replace(os.sep, ".").lstrip(".")
         config["apps"][cls.diff_app] = {
             "models": [path],
             "default_connection": config.get("apps").get(app).get("default_connection", "default"),
@@ -197,7 +210,15 @@ class Migrate:
         old_model_files = []
         models = config.get("apps").get(app).get("models")
         for model in models:
-            old_model_files.append(import_module(model).__file__)
+            module = import_module(model)
+            possible_models = [getattr(module, attr_name) for attr_name in dir(module)]
+            for attr in filter(
+                lambda x: inspect.isclass(x) and issubclass(x, Model) and x is not Model,
+                possible_models,
+            ):
+                file = inspect.getfile(attr)
+                if file not in old_model_files:
+                    old_model_files.append(file)
         pattern = rf"(\n)?('|\")({app})(.\w+)('|\")"
         str_io = StringIO()
         for i, model_file in enumerate(old_model_files):
@@ -289,13 +310,26 @@ class Migrate:
                         else:
                             is_rename = diff_key in cls._rename_new
                         if is_rename:
-                            cls._add_operator(
+                            if (
-                                cls._rename_field(new_model, old_field, new_field), upgrade,
+                                cls.dialect == "mysql"
-                            )
+                                and cls._db_version
+                                and cls._db_version.startswith("5.")
+                            ):
+                                cls._add_operator(
+                                    cls._change_field(new_model, old_field, new_field),
+                                    upgrade,
+                                )
+                            else:
+                                cls._add_operator(
+                                    cls._rename_field(new_model, old_field, new_field),
+                                    upgrade,
+                                )
                             break
                 else:
                     cls._add_operator(
-                        cls._add_field(new_model, new_field), upgrade, cls._is_fk_m2m(new_field),
+                        cls._add_field(new_model, new_field),
+                        upgrade,
+                        cls._is_fk_m2m(new_field),
                     )
             else:
                 old_field = old_fields_map.get(new_key)
@@ -311,7 +345,9 @@ class Migrate:
                             cls._add_operator(
                                 cls._alter_null(new_model, new_field), upgrade=upgrade
                             )
-                        if new_field.default != old_field.default:
+                        if new_field.default != old_field.default and not callable(
+                            new_field.default
+                        ):
                             cls._add_operator(
                                 cls._alter_default(new_model, new_field), upgrade=upgrade
                             )
@@ -346,11 +382,15 @@ class Migrate:
                 if isinstance(new_field, ForeignKeyFieldInstance):
                     if old_field.db_constraint and not new_field.db_constraint:
                         cls._add_operator(
-                            cls._drop_fk(new_model, new_field), upgrade, True,
+                            cls._drop_fk(new_model, new_field),
+                            upgrade,
+                            True,
                         )
                     if new_field.db_constraint and not old_field.db_constraint:
                         cls._add_operator(
-                            cls._add_fk(new_model, new_field), upgrade, True,
+                            cls._add_fk(new_model, new_field),
+                            upgrade,
+                            True,
                         )
 
         for old_key in old_keys:
@@ -360,12 +400,20 @@ class Migrate:
                     not upgrade and old_key not in cls._rename_new
                 ):
                     cls._add_operator(
-                        cls._remove_field(old_model, field), upgrade, cls._is_fk_m2m(field),
+                        cls._remove_field(old_model, field),
+                        upgrade,
+                        cls._is_fk_m2m(field),
                     )
 
         for new_index in new_indexes:
             if new_index not in old_indexes:
-                cls._add_operator(cls._add_index(new_model, new_index,), upgrade)
+                cls._add_operator(
+                    cls._add_index(
+                        new_model,
+                        new_index,
+                    ),
+                    upgrade,
+                )
         for old_index in old_indexes:
             if old_index not in new_indexes:
                 cls._add_operator(cls._remove_index(old_model, old_index), upgrade)
@@ -461,6 +509,15 @@ class Migrate:
     def _rename_field(cls, model: Type[Model], old_field: Field, new_field: Field):
         return cls.ddl.rename_column(model, old_field.model_field_name, new_field.model_field_name)
 
+    @classmethod
+    def _change_field(cls, model: Type[Model], old_field: Field, new_field: Field):
+        return cls.ddl.change_column(
+            model,
+            old_field.model_field_name,
+            new_field.model_field_name,
+            new_field.get_for_dialect(cls.dialect, "SQL_TYPE"),
+        )
+
     @classmethod
     def _add_fk(cls, model: Type[Model], field: ForeignKeyFieldInstance):
         """

aerich/utils.py

@@ -1,17 +1,24 @@
 import importlib
+from typing import Dict
 
 from click import BadOptionUsage, Context
 from tortoise import BaseDBAsyncClient, Tortoise
 
 
-def get_app_connection_name(config, app) -> str:
+def get_app_connection_name(config, app_name: str) -> str:
     """
     get connection name
     :param config:
-    :param app:
+    :param app_name:
     :return:
     """
-    return config.get("apps").get(app).get("default_connection", "default")
+    app = config.get("apps").get(app_name)
+    if app:
+        return app.get("default_connection", "default")
+    raise BadOptionUsage(
+        option_name="--app",
+        message=f'Can\'t get app named "{app_name}"',
+    )
 
 
 def get_app_connection(config, app) -> BaseDBAsyncClient:
@@ -49,3 +56,55 @@ def get_tortoise_config(ctx: Context, tortoise_orm: str) -> dict:
             ctx=ctx,
         )
     return config
+
+
+_UPGRADE = "-- upgrade --\n"
+_DOWNGRADE = "-- downgrade --\n"
+
+
+def get_version_content_from_file(version_file: str) -> Dict:
+    """
+    get version content
+    :param version_file:
+    :return:
+    """
+    with open(version_file, "r", encoding="utf-8") as f:
+        content = f.read()
+        first = content.index(_UPGRADE)
+        try:
+            second = content.index(_DOWNGRADE)
+        except ValueError:
+            second = len(content) - 1
+        upgrade_content = content[first + len(_UPGRADE) : second].strip()  # noqa:E203
+        downgrade_content = content[second + len(_DOWNGRADE) :].strip()  # noqa:E203
+        ret = {
+            "upgrade": list(filter(lambda x: x or False, upgrade_content.split(";\n"))),
+            "downgrade": list(filter(lambda x: x or False, downgrade_content.split(";\n"))),
+        }
+        return ret
+
+
+def write_version_file(version_file: str, content: Dict):
+    """
+    write version file
+    :param version_file:
+    :param content:
+    :return:
+    """
+    with open(version_file, "w", encoding="utf-8") as f:
+        f.write(_UPGRADE)
+        upgrade = content.get("upgrade")
+        if len(upgrade) > 1:
+            f.write(";\n".join(upgrade) + ";\n")
+        else:
+            f.write(f"{upgrade[0]}")
+            if not upgrade[0].endswith(";"):
+                f.write(";")
+            f.write("\n")
+        downgrade = content.get("downgrade")
+        if downgrade:
+            f.write(_DOWNGRADE)
+            if len(downgrade) > 1:
+                f.write(";\n".join(downgrade) + ";\n")
+            else:
+                f.write(f"{downgrade[0]};\n")

conftest.py

@@ -13,10 +13,15 @@ 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:")
 tortoise_orm = {
-    "connections": {"default": expand_db_url(db_url, True)},
+    "connections": {
+        "default": expand_db_url(db_url, True),
+        "second": expand_db_url(db_url_second, True),
+    },
     "apps": {
         "models": {"models": ["tests.models", "aerich.models"], "default_connection": "default"},
+        "models_second": {"models": ["tests.models_second"], "default_connection": "second"},
     },
 }
 
@@ -31,7 +36,7 @@ def reset_migrate():
     Migrate._downgrade_m2m = []
 
 
-@pytest.yield_fixture(scope="session")
+@pytest.fixture(scope="session")
 def event_loop():
     policy = asyncio.get_event_loop_policy()
     res = policy.new_event_loop()
@@ -62,5 +67,5 @@ async def initialize_tests(event_loop, request):
         Migrate.ddl = SqliteDDL(client)
     elif client.schema_generator is AsyncpgSchemaGenerator:
         Migrate.ddl = PostgresDDL(client)
-
+    Migrate.dialect = Migrate.ddl.DIALECT
     request.addfinalizer(lambda: event_loop.run_until_complete(Tortoise._drop_databases()))

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "aerich"
-version = "0.3.0"
+version = "0.4.3"
 description = "A database migrations tool for Tortoise ORM."
 authors = ["long2ice <long2ice@gmail.com>"]
 license = "Apache-2.0"
@@ -21,11 +21,12 @@ click = "*"
 pydantic = "*"
 aiomysql = {version = "*", optional = true}
 asyncpg = {version = "*", optional = true}
+ddlparse = "*"
 
 [tool.poetry.dev-dependencies]
 flake8 = "*"
 isort = "*"
-black = "^19.10b0"
+black = "^20.8b1"
 pytest = "*"
 pytest-xdist = "*"
 pytest-asyncio = "*"

tests/models_second.py

@@ -0,0 +1,63 @@
+import datetime
+from enum import IntEnum
+
+from tortoise import Model, fields
+
+
+class ProductType(IntEnum):
+    article = 1
+    page = 2
+
+
+class PermissionAction(IntEnum):
+    create = 1
+    delete = 2
+    update = 3
+    read = 4
+
+
+class Status(IntEnum):
+    on = 1
+    off = 0
+
+
+class User(Model):
+    username = fields.CharField(max_length=20, unique=True)
+    password = fields.CharField(max_length=200)
+    last_login = fields.DatetimeField(description="Last Login", default=datetime.datetime.now)
+    is_active = fields.BooleanField(default=True, description="Is Active")
+    is_superuser = fields.BooleanField(default=False, description="Is SuperUser")
+    avatar = fields.CharField(max_length=200, default="")
+    intro = fields.TextField(default="")
+
+
+class Email(Model):
+    email = fields.CharField(max_length=200)
+    is_primary = fields.BooleanField(default=False)
+    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")
+    created_at = fields.DatetimeField(auto_now_add=True)
+
+
+class Product(Model):
+    categories = fields.ManyToManyField("models_second.Category")
+    name = fields.CharField(max_length=50)
+    view_num = fields.IntField(description="View Num")
+    sort = fields.IntField()
+    is_reviewed = fields.BooleanField(description="Is Reviewed")
+    type = fields.IntEnumField(ProductType, description="Product Type")
+    image = fields.CharField(max_length=200)
+    body = fields.TextField()
+    created_at = fields.DatetimeField(auto_now_add=True)
+
+
+class Config(Model):
+    label = fields.CharField(max_length=200)
+    key = fields.CharField(max_length=20)
+    value = fields.JSONField()
+    status: Status = fields.IntEnumField(Status, default=Status.on)

tests/test_ddl.py

@@ -42,7 +42,7 @@ def test_create_table():
     "id" SERIAL NOT NULL PRIMARY KEY,
     "slug" VARCHAR(200) NOT NULL,
     "name" VARCHAR(200) NOT NULL,
-    "created_at" TIMESTAMP NOT NULL  DEFAULT CURRENT_TIMESTAMP,
+    "created_at" TIMESTAMPTZ NOT NULL  DEFAULT CURRENT_TIMESTAMP,
     "user_id" INT NOT NULL REFERENCES "user" ("id") ON DELETE CASCADE
 );
 COMMENT ON COLUMN "category"."user_id" IS 'User';"""

tests/test_migrate.py

@@ -62,18 +62,18 @@ def test_sort_all_version_files(mocker):
     mocker.patch(
         "os.listdir",
         return_value=[
-            "1_datetime_update.json",
+            "1_datetime_update.sql",
-            "11_datetime_update.json",
+            "11_datetime_update.sql",
-            "10_datetime_update.json",
+            "10_datetime_update.sql",
-            "2_datetime_update.json",
+            "2_datetime_update.sql",
         ],
     )
 
     Migrate.migrate_location = "."
 
     assert Migrate.get_all_version_files() == [
-        "1_datetime_update.json",
+        "1_datetime_update.sql",
-        "2_datetime_update.json",
+        "2_datetime_update.sql",
-        "10_datetime_update.json",
+        "10_datetime_update.sql",
-        "11_datetime_update.json",
+        "11_datetime_update.sql",
     ]