40 lines
1.3 KiB
Python
40 lines
1.3 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from sqlalchemy import MetaData, Table
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from migrate.changeset.constraint import ForeignKeyConstraint
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def upgrade(migrate_engine):
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meta = MetaData()
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meta.bind = migrate_engine
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snapshots = Table('snapshots', meta, autoload=True)
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volumes = Table('volumes', meta, autoload=True)
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ForeignKeyConstraint(
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columns=[snapshots.c.volume_id],
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refcolumns=[volumes.c.id]).create()
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def downgrade(migrate_engine):
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meta = MetaData()
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meta.bind = migrate_engine
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snapshots = Table('snapshots', meta, autoload=True)
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volumes = Table('volumes', meta, autoload=True)
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ForeignKeyConstraint(
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columns=[snapshots.c.volume_id],
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refcolumns=[volumes.c.id]).drop()
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