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后端源码/yifan.action-ai.cn/app/alembic/env.py

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+import asyncio
+from logging.config import fileConfig
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import create_async_engine
+from sqlalchemy import pool
+from alembic import context
+
+from app.config.path_conf import ALEMBIC_VERSION_DIR
+from app.utils.import_util import ImportUtil
+from app.core.base_model import MappedBase
+from app.config.setting import settings
+
+# 确保 alembic 版本目录存在
+ALEMBIC_VERSION_DIR.mkdir(parents=True, exist_ok=True)
+
+# 清除MappedBase.metadata中的表定义，避免重复注册
+if hasattr(MappedBase, 'metadata') and MappedBase.metadata.tables:
+    print(f"🧹 清除已存在的表定义，当前有 {len(MappedBase.metadata.tables)} 个表")
+    # 创建一个新的空metadata对象
+    from sqlalchemy import MetaData
+    MappedBase.metadata = MetaData()
+    print("✅️ 已重置metadata")
+
+# 自动查找所有模型
+print("🔍 开始查找模型...")
+found_models = ImportUtil.find_models(MappedBase)
+print(f"📊 找到 {len(found_models)} 个有效模型")
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+alembic_config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if alembic_config.config_file_name is not None:
+    fileConfig(alembic_config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = MappedBase.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+alembic_config.set_main_option("sqlalchemy.url", settings.ASYNC_DB_URI)
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = alembic_config.get_main_option("sqlalchemy.url")
+    # 确保URL不为None
+    if url is None:
+        raise ValueError("数据库URL未正确配置，请检查环境配置文件")
+        
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    url = alembic_config.get_main_option("sqlalchemy.url")
+    # 确保URL不为None
+    if url is None:
+        raise ValueError("数据库URL未正确配置，请检查环境配置文件")
+        
+    connectable = create_async_engine(url, poolclass=pool.NullPool)
+    
+    async def run_async_migrations():
+        async with connectable.connect() as connection:
+            await connection.run_sync(do_run_migrations)
+        await connectable.dispose()
+
+    def do_run_migrations(connection: Connection) -> None:
+        def process_revision_directives(context, revision, directives):
+            script = directives[0]
+
+            # 检查所有操作集是否为空
+            all_empty = all(ops.is_empty() for ops in script.upgrade_ops_list)
+
+            if all_empty:
+                # 如果没有实际变更，不生成迁移文件
+                directives[:] = []
+                print('❎️ 未检测到模型变更，不生成迁移文件')
+            else:
+                print('✅️ 检测到模型变更，生成迁移文件')
+
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            compare_type=True,
+            compare_server_default=True,
+            transaction_per_migration=True,
+            process_revision_directives=process_revision_directives,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()