mirror of
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88 lines
2.3 KiB
Python
88 lines
2.3 KiB
Python
"""2.2.5
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mediaserveritem 改为按 server + item_id 唯一
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Revision ID: b8f6e3a1c2d4
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Revises: 93f8cb6a4d1e
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Create Date: 2026-05-09
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"""
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from alembic import op
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import sqlalchemy as sa
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# revision identifiers, used by Alembic.
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revision = "b8f6e3a1c2d4"
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down_revision = "93f8cb6a4d1e"
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branch_labels = None
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depends_on = None
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TABLE_NAME = "mediaserveritem"
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INDEX_NAME = "ux_mediaserveritem_server_item_id"
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INDEX_COLUMNS = ["server", "item_id"]
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mediaserveritem = sa.table(
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TABLE_NAME,
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sa.column("id", sa.Integer),
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sa.column("server", sa.String),
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sa.column("item_id", sa.String),
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)
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def _table_exists(inspector: sa.Inspector) -> bool:
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return TABLE_NAME in inspector.get_table_names()
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def _has_index_signature(inspector: sa.Inspector, unique: bool) -> bool:
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target_columns = tuple(INDEX_COLUMNS)
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for index in inspector.get_indexes(TABLE_NAME):
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if tuple(index.get("column_names") or []) == target_columns and bool(index.get("unique")) == unique:
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return True
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return False
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def _drop_index_if_exists(inspector: sa.Inspector) -> None:
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for index in inspector.get_indexes(TABLE_NAME):
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if index.get("name") == INDEX_NAME:
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op.drop_index(INDEX_NAME, table_name=TABLE_NAME)
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return
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def _deduplicate_rows() -> None:
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bind = op.get_bind()
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keep_ids = (
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sa.select(sa.func.max(mediaserveritem.c.id))
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.where(
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mediaserveritem.c.server.is_not(None),
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mediaserveritem.c.item_id.is_not(None),
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)
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.group_by(mediaserveritem.c.server, mediaserveritem.c.item_id)
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)
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bind.execute(
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mediaserveritem.delete().where(
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sa.and_(
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mediaserveritem.c.server.is_not(None),
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mediaserveritem.c.item_id.is_not(None),
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mediaserveritem.c.id.not_in(keep_ids),
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)
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)
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)
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def upgrade() -> None:
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inspector = sa.inspect(op.get_bind())
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if not _table_exists(inspector):
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return
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_deduplicate_rows()
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inspector = sa.inspect(op.get_bind())
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if not _has_index_signature(inspector, unique=True):
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op.create_index(INDEX_NAME, TABLE_NAME, INDEX_COLUMNS, unique=True)
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def downgrade() -> None:
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inspector = sa.inspect(op.get_bind())
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if not _table_exists(inspector):
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return
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_drop_index_if_exists(inspector)
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