61 lines
2.2 KiB
Python
61 lines
2.2 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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import migrate
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import sqlalchemy as sql
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_ROLE_NAME_NEW_CONSTRAINT = 'ixu_role_name_domain_id'
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_ROLE_TABLE_NAME = 'role'
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_ROLE_NAME_COLUMN_NAME = 'name'
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_DOMAIN_ID_COLUMN_NAME = 'domain_id'
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_NULL_DOMAIN_ID = '<<null>>'
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def upgrade(migrate_engine):
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meta = sql.MetaData()
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meta.bind = migrate_engine
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role_table = sql.Table(_ROLE_TABLE_NAME, meta, autoload=True)
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domain_id = sql.Column(_DOMAIN_ID_COLUMN_NAME, sql.String(64),
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nullable=False, server_default=_NULL_DOMAIN_ID)
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# NOTE(morganfainberg): the `role_name` unique constraint is not
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# guaranteed to be a fixed name, such as 'ixu_role_name`, so we need to
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# search for the correct constraint that only affects role_table.c.name
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# and drop that constraint.
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to_drop = None
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if migrate_engine.name == 'mysql':
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for c in role_table.indexes:
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if (c.unique and len(c.columns) == 1 and
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_ROLE_NAME_COLUMN_NAME in c.columns):
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to_drop = c
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break
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else:
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for c in role_table.constraints:
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if len(c.columns) == 1 and _ROLE_NAME_COLUMN_NAME in c.columns:
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to_drop = c
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break
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if to_drop is not None:
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migrate.UniqueConstraint(role_table.c.name,
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name=to_drop.name).drop()
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# perform changes after constraint is dropped.
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if 'domain_id' not in role_table.columns:
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# Only create the column if it doesn't already exist.
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role_table.create_column(domain_id)
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migrate.UniqueConstraint(role_table.c.name,
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role_table.c.domain_id,
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name=_ROLE_NAME_NEW_CONSTRAINT).create()
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