45 lines
1.7 KiB
Python
45 lines
1.7 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 migrate import ForeignKeyConstraint
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import sqlalchemy as sa
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class ForeignKeyHandle(object):
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def __init__(self, meta):
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sample = sa.Table('sample', meta, autoload=True)
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meter = sa.Table('meter', meta, autoload=True)
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self.sample_params = {'columns': [sample.c.meter_id],
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'refcolumns': [meter.c.id]}
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if meta.bind.engine.name == 'mysql':
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self.sample_params['name'] = "fk_sample_meter_id"
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def __enter__(self):
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ForeignKeyConstraint(**self.sample_params).drop()
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def __exit__(self, type, value, traceback):
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ForeignKeyConstraint(**self.sample_params).create()
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def upgrade(migrate_engine):
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if migrate_engine.name == 'sqlite':
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return
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meta = sa.MetaData(bind=migrate_engine)
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sample = sa.Table('sample', meta, autoload=True)
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with ForeignKeyHandle(meta):
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# remove stray indexes implicitly created by InnoDB
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for index in sample.indexes:
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if index.name in ['fk_sample_meter_id', 'fk_sample_resource_id']:
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index.drop()
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sa.Index('ix_sample_meter_id', sample.c.meter_id).create()
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