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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2013 Boris Pavlovic (boris@pavlovic.me).
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from migrate.changeset import UniqueConstraint
from sqlalchemy import MetaData, Table
from nova.db.sqlalchemy import utils
UC_NAME = "uniq_vlan_x_deleted"
COLUMNS = ('vlan', 'deleted')
TABLE_NAME = 'networks'
def upgrade(migrate_engine):
meta = MetaData(bind=migrate_engine)
t = Table(TABLE_NAME, meta, autoload=True)
utils.drop_old_duplicate_entries_from_table(migrate_engine, TABLE_NAME,
True, *COLUMNS)
uc = UniqueConstraint(*COLUMNS, table=t, name=UC_NAME)
uc.create()
def downgrade(migrate_engine):
utils.drop_unique_constraint(migrate_engine, TABLE_NAME, UC_NAME, *COLUMNS)
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