86 lines
3.1 KiB
Python
86 lines
3.1 KiB
Python
# Copyright 2016, Hitachi Data Systems.
|
|
#
|
|
# 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.
|
|
|
|
|
|
"""move_share_type_id_to_instances
|
|
|
|
Revision ID: 48a7beae3117
|
|
Revises: 63809d875e32
|
|
Create Date: 2016-07-19 13:04:50.035139
|
|
|
|
"""
|
|
|
|
# revision identifiers, used by Alembic.
|
|
revision = '48a7beae3117'
|
|
down_revision = '63809d875e32'
|
|
|
|
from alembic import op
|
|
import sqlalchemy as sa
|
|
|
|
from manila.db.migrations import utils
|
|
|
|
|
|
def upgrade():
|
|
"""Move share_type_id from Shares to Share Instances table."""
|
|
|
|
# NOTE(ganso): Adding share_type_id as a foreign key to share_instances
|
|
# table. Please note that share_type_id is NOT a foreign key in shares
|
|
# table prior to this migration.
|
|
op.add_column(
|
|
'share_instances',
|
|
sa.Column('share_type_id', sa.String(36),
|
|
sa.ForeignKey('share_types.id', name='si_st_id_fk'),
|
|
nullable=True))
|
|
connection = op.get_bind()
|
|
shares_table = utils.load_table('shares', connection)
|
|
share_instances_table = utils.load_table('share_instances', connection)
|
|
|
|
for instance in connection.execute(share_instances_table.select()):
|
|
share = connection.execute(shares_table.select().where(
|
|
instance['share_id'] == shares_table.c.id)).first()
|
|
# pylint: disable=no-value-for-parameter
|
|
op.execute(share_instances_table.update().where(
|
|
share_instances_table.c.id == instance['id']).values(
|
|
{'share_type_id': share['share_type_id']}))
|
|
|
|
op.drop_column('shares', 'share_type_id')
|
|
|
|
|
|
def downgrade():
|
|
"""Move share_type_id from Share Instances to Shares table.
|
|
|
|
This method can lead to data loss because only the share_type_id from the
|
|
first share instance is moved to the shares table.
|
|
"""
|
|
|
|
# NOTE(ganso): Adding back share_type_id to the shares table NOT as a
|
|
# foreign key, as it was before.
|
|
op.add_column(
|
|
'shares',
|
|
sa.Column('share_type_id', sa.String(36), nullable=True))
|
|
connection = op.get_bind()
|
|
shares_table = utils.load_table('shares', connection)
|
|
share_instances_table = utils.load_table('share_instances', connection)
|
|
|
|
for share in connection.execute(shares_table.select()):
|
|
instance = connection.execute(share_instances_table.select().where(
|
|
share['id'] == share_instances_table.c.share_id)).first()
|
|
# pylint: disable=no-value-for-parameter
|
|
op.execute(shares_table.update().where(
|
|
shares_table.c.id == instance['share_id']).values(
|
|
{'share_type_id': instance['share_type_id']}))
|
|
|
|
op.drop_constraint('si_st_id_fk', 'share_instances', type_='foreignkey')
|
|
op.drop_column('share_instances', 'share_type_id')
|