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80 lines
2.3 KiB
Python
80 lines
2.3 KiB
Python
"""Task: Add wechat_openid / wechat_unionid to users
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Revision ID: 025
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Revises: 024
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Create Date: 2026-07-05
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补录微信小程序登录所需的 wechat 字段。
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生产数据库已手动添加过这些字段和索引，因此 upgrade 做幂等检查，
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避免在已有字段的库上执行报错。
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"""
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import sqlalchemy as sa
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from alembic import op
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revision = "025"
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down_revision = "024"
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branch_labels = None
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depends_on = None
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def _column_exists(table: str, column: str) -> bool:
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"""检查列是否已存在。离线模式下返回 False。"""
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conn = op.get_bind()
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try:
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result = conn.execute(
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sa.text("SELECT 1 FROM information_schema.columns " "WHERE table_name = :table AND column_name = :column"),
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{"table": table, "column": column},
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)
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if result is None:
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return False
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return result.scalar() is not None
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except Exception:
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return False
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def _index_exists(index: str) -> bool:
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"""检查索引是否已存在。离线模式下返回 False。"""
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conn = op.get_bind()
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try:
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result = conn.execute(
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sa.text("SELECT 1 FROM pg_indexes WHERE indexname = :index"),
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{"index": index},
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)
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if result is None:
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return False
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return result.scalar() is not None
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except Exception:
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return False
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def upgrade() -> None:
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# wechat_openid
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if not _column_exists("users", "wechat_openid"):
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op.add_column(
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"users",
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sa.Column("wechat_openid", sa.String(length=128), nullable=True),
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)
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# wechat_unionid
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if not _column_exists("users", "wechat_unionid"):
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op.add_column(
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"users",
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sa.Column("wechat_unionid", sa.String(length=128), nullable=True),
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)
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# 唯一索引
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if not _index_exists("ix_users_wechat_openid"):
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op.create_index("ix_users_wechat_openid", "users", ["wechat_openid"], unique=True)
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if not _index_exists("ix_users_wechat_unionid"):
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op.create_index("ix_users_wechat_unionid", "users", ["wechat_unionid"], unique=True)
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def downgrade() -> None:
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op.drop_index("ix_users_wechat_unionid", table_name="users")
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op.drop_index("ix_users_wechat_openid", table_name="users")
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op.drop_column("users", "wechat_unionid")
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op.drop_column("users", "wechat_openid")
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