45 lines
1.9 KiB
Python
45 lines
1.9 KiB
Python
# Copyright 2016 NTT DATA
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# All Rights Reserved.
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#
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# 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 migrate import ForeignKeyConstraint, UniqueConstraint
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import sqlalchemy
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from sqlalchemy import Table
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def upgrade(migrate_engine):
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meta = sqlalchemy.MetaData()
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meta.bind = migrate_engine
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hosts_table = Table('hosts', meta, autoload=True)
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failover_segments = Table('failover_segments', meta, autoload=True)
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# NOTE(Dinesh_Bhor) We need to drop foreign keys first because unique
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# constraints that we want to delete depend on them. So drop the fk and
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# recreate it again after unique constraint deletion.
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cons_fk = ForeignKeyConstraint([hosts_table.c.failover_segment_id],
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[failover_segments.c.uuid],
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name="fk_failover_segments_uuid")
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cons_fk.drop(engine=migrate_engine)
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cons_unique = UniqueConstraint('failover_segment_id', 'name', 'deleted',
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name='uniq_host0name0deleted',
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table=hosts_table)
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cons_unique.drop(engine=migrate_engine)
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# Create an updated unique constraint
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updated_cons_unique = UniqueConstraint('name', 'deleted',
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name='uniq_host0name0deleted',
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table=hosts_table)
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cons_fk.create()
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updated_cons_unique.create()
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