45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
#
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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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# This is a placeholder for Liberty backports.
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# Do not use this number for new Mitaka work. New Mitaka work starts after
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# all the placeholders.
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import sqlalchemy
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from migrate import ForeignKeyConstraint
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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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resource_data = sqlalchemy.Table('resource_data', meta, autoload=True)
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resource = sqlalchemy.Table('resource', meta, autoload=True)
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for fk in resource_data.foreign_keys:
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if fk.column == resource.c.id:
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# delete the existing fk
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# and create with ondelete cascade and a proper name
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existing_fkey = ForeignKeyConstraint(
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columns=[resource_data.c.resource_id],
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refcolumns=[resource.c.id], name=fk.name)
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existing_fkey.drop()
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fkey = ForeignKeyConstraint(
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columns=[resource_data.c.resource_id],
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refcolumns=[resource.c.id],
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name="fk_resource_id", ondelete='CASCADE')
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fkey.create()
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break
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