58 lines
1.8 KiB
Python
58 lines
1.8 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 alembic import op
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from sqlalchemy.engine import reflection
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"""Rename ml2_network_segments table
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Revision ID: 89ab9a816d70
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Revises: 7bbb25278f53
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Create Date: 2016-03-22 00:22:47.618593
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"""
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# revision identifiers, used by Alembic.
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revision = '89ab9a816d70'
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down_revision = '7bbb25278f53'
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TABLE_NAME = 'ml2_port_binding_levels'
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OLD_REFERRED_TABLE_NAME = 'ml2_network_segments'
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NEW_REFERRED_TABLE_NAME = 'networksegments'
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def upgrade():
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fk_name = delete_foreign_key_constraint()
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op.rename_table(OLD_REFERRED_TABLE_NAME, NEW_REFERRED_TABLE_NAME)
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op.create_foreign_key(
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constraint_name=fk_name,
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source_table=TABLE_NAME,
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referent_table=NEW_REFERRED_TABLE_NAME,
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local_cols=['segment_id'],
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remote_cols=['id'],
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ondelete="SET NULL"
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)
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def delete_foreign_key_constraint():
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inspector = reflection.Inspector.from_engine(op.get_bind())
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fk_constraints = inspector.get_foreign_keys(TABLE_NAME)
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for fk in fk_constraints:
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if fk['referred_table'] == OLD_REFERRED_TABLE_NAME:
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op.drop_constraint(
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constraint_name=fk['name'],
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table_name=TABLE_NAME,
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type_='foreignkey'
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)
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return fk['name']
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