add sqlite not support error

aerich/ddl/sqlite/__init__.py

@@ -1,8 +1,19 @@
+from typing import Type
+
+from tortoise import Model
 from tortoise.backends.sqlite.schema_generator import SqliteSchemaGenerator
+from tortoise.fields import Field
 
 from aerich.ddl import BaseDDL
+from aerich.exceptions import NotSupportError
 
 
 class SqliteDDL(BaseDDL):
     schema_generator_cls = SqliteSchemaGenerator
     DIALECT = SqliteSchemaGenerator.DIALECT
+
+    def drop_column(self, model: "Type[Model]", column_name: str):
+        raise NotSupportError("Drop column is not support in SQLite.")
+
+    def modify_column(self, model: "Type[Model]", field_object: Field):
+        raise NotSupportError("Modify column is not support in SQLite.")

aerich/exceptions.py

@@ -1,6 +1,4 @@
-class ConfigurationError(Exception):
+class NotSupportError(Exception):
     """
-    config error
+    raise when features not support
     """
-
-    pass

tests/test_ddl.py

@@ -1,6 +1,9 @@
+import pytest
+
 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 tests.models import Category, User
 
@@ -63,27 +66,26 @@ def test_add_column():
 
 
 def test_modify_column():
-    ret = Migrate.ddl.modify_column(Category, Category._meta.fields_map.get("name"))
-    if isinstance(Migrate.ddl, MysqlDDL):
-        assert ret == "ALTER TABLE `category` MODIFY COLUMN `name` VARCHAR(200) NOT NULL"
-    elif isinstance(Migrate.ddl, PostgresDDL):
-        assert ret == 'ALTER TABLE "category" ALTER COLUMN "name" TYPE VARCHAR(200)'
-    else:
-        assert ret == 'ALTER TABLE "category" MODIFY COLUMN "name" VARCHAR(200) NOT NULL'
+    if isinstance(Migrate.ddl, SqliteDDL):
+        with pytest.raises(NotSupportError):
+            ret0 = Migrate.ddl.modify_column(Category, Category._meta.fields_map.get("name"))
+            ret1 = Migrate.ddl.modify_column(User, User._meta.fields_map.get("is_active"))
+
+    else:
+        ret0 = Migrate.ddl.modify_column(Category, Category._meta.fields_map.get("name"))
+        ret1 = Migrate.ddl.modify_column(User, User._meta.fields_map.get("is_active"))
+    if isinstance(Migrate.ddl, MysqlDDL):
+        assert ret0 == "ALTER TABLE `category` MODIFY COLUMN `name` VARCHAR(200) NOT NULL"
+    elif isinstance(Migrate.ddl, PostgresDDL):
+        assert ret0 == 'ALTER TABLE "category" ALTER COLUMN "name" TYPE VARCHAR(200)'
 
-    ret = Migrate.ddl.modify_column(User, User._meta.fields_map.get("is_active"))
     if isinstance(Migrate.ddl, MysqlDDL):
         assert (
-            ret
+            ret1
             == "ALTER TABLE `user` MODIFY COLUMN `is_active` BOOL NOT NULL  COMMENT 'Is Active' DEFAULT 1"
         )
     elif isinstance(Migrate.ddl, PostgresDDL):
-        assert ret == 'ALTER TABLE "user" ALTER COLUMN "is_active" TYPE BOOL'
-    else:
-        assert (
-            ret
-            == 'ALTER TABLE "user" MODIFY COLUMN "is_active" INT NOT NULL  DEFAULT 1 /* Is Active */'
-        )
+        assert ret1 == 'ALTER TABLE "user" ALTER COLUMN "is_active" TYPE BOOL'
 
 
 def test_alter_column_default():
@@ -131,10 +133,12 @@ def test_set_comment():
 
 
 def test_drop_column():
-    ret = Migrate.ddl.drop_column(Category, "name")
+    if isinstance(Migrate.ddl, SqliteDDL):
+        with pytest.raises(NotSupportError):
+            ret = Migrate.ddl.drop_column(Category, "name")
     if isinstance(Migrate.ddl, MysqlDDL):
         assert ret == "ALTER TABLE `category` DROP COLUMN `name`"
-    else:
+    elif isinstance(Migrate.ddl, PostgresDDL):
         assert ret == 'ALTER TABLE "category" DROP COLUMN "name"'
 
 

tests/test_migrate.py

@@ -1,7 +1,10 @@
+import pytest
 from tortoise import Tortoise
 
 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
 
 
@@ -10,7 +13,9 @@ def test_migrate():
     models = apps.get("models")
     diff_models = apps.get("diff_models")
     Migrate.diff_models(diff_models, models)
-    Migrate.diff_models(models, diff_models, False)
+    if isinstance(Migrate.ddl, SqliteDDL):
+        with pytest.raises(NotSupportError):
+            Migrate.diff_models(models, diff_models, False)
     if isinstance(Migrate.ddl, MysqlDDL):
         assert Migrate.upgrade_operators == [
             "ALTER TABLE `category` ADD `name` VARCHAR(200) NOT NULL",
@@ -29,15 +34,12 @@ def test_migrate():
             'ALTER TABLE "category" DROP COLUMN "name"',
             'ALTER TABLE "user" DROP CONSTRAINT "uid_user_usernam_9987ab"',
         ]
-    else:
+    elif isinstance(Migrate.ddl, SqliteDDL):
         assert Migrate.upgrade_operators == [
             'ALTER TABLE "category" ADD "name" VARCHAR(200) NOT NULL',
             'ALTER TABLE "user" ADD UNIQUE INDEX "uid_user_usernam_9987ab" ("username")',
         ]
-        assert Migrate.downgrade_operators == [
-            'ALTER TABLE "category" DROP COLUMN "name"',
-            'ALTER TABLE "user" DROP INDEX "uid_user_usernam_9987ab"',
-        ]
+        assert Migrate.downgrade_operators == []
 
 
 def test_sort_all_version_files(mocker):