74 lines
2.4 KiB
Python
74 lines
2.4 KiB
Python
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"""Alembic 迁移环境配置
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- 从 shared.config.settings 读取 DB 配置，构造同步 URL（psycopg2）供 alembic 使用
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（项目运行时用 asyncpg，但 alembic 是同步库，需 psycopg2）
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- target_metadata 指向 shared.models.database.Base.metadata
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- 支持 ALEMBIC_URL 环境变量覆盖（用于离线/空库生成初始迁移，如 sqlite:///empty.db）
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"""
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from logging.config import fileConfig
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from pathlib import Path
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import os
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import sys
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from sqlalchemy import engine_from_config, pool
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from alembic import context
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# 让 alembic 能 import 项目模块（src 在项目根下）
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project_root = Path(__file__).parent.parent
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sys.path.insert(0, str(project_root / "src"))
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from shared.config.settings import settings # noqa: E402
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from shared.models.database import Base # noqa: E402
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import shared.models.database # noqa: E402,F401 # 导入所有模型，确保 metadata 注册
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config = context.config
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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# 构造同步 URL：asyncpg -> psycopg2
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_sync_url = settings.DATABASE_URL.replace("postgresql+asyncpg://", "postgresql+psycopg2://")
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# 支持 ALEMBIC_URL 覆盖（离线生成/测试用）
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config.set_main_option("sqlalchemy.url", os.getenv("ALEMBIC_URL", _sync_url))
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target_metadata = Base.metadata
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def run_migrations_offline() -> None:
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"""离线模式：生成 SQL 脚本，不连接 DB"""
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url = config.get_main_option("sqlalchemy.url")
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context.configure(
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url=url,
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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compare_type=True,
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compare_server_default=True,
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)
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with context.begin_transaction():
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context.run_migrations()
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def run_migrations_online() -> None:
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"""在线模式：连接 DB 执行迁移"""
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connectable = engine_from_config(
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config.get_section(config.config_ini_section, {}),
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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with connectable.connect() as connection:
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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compare_type=True,
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compare_server_default=True,
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)
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with context.begin_transaction():
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context.run_migrations()
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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