87 lines
3.1 KiB
Python
87 lines
3.1 KiB
Python
#
|
|
# 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 alembic import op
|
|
import sqlalchemy as sa
|
|
|
|
"""add standardattr to qos policies
|
|
|
|
Revision ID: b12a3ef66e62
|
|
Revises: 3b935b28e7a0
|
|
Create Date: 2016-08-18 14:10:30.021055
|
|
|
|
"""
|
|
|
|
# revision identifiers, used by Alembic.
|
|
revision = 'b12a3ef66e62'
|
|
down_revision = '3b935b28e7a0'
|
|
depends_on = ('67daae611b6e',)
|
|
|
|
|
|
# basic model of the tables with required field for migration
|
|
TABLE = 'qos_policies'
|
|
|
|
|
|
TABLE_MODEL = sa.Table(TABLE, sa.MetaData(),
|
|
sa.Column('id', sa.String(length=36), nullable=False),
|
|
sa.Column('description', sa.String(length=255),
|
|
nullable=True),
|
|
sa.Column('standard_attr_id', sa.BigInteger(),
|
|
nullable=True))
|
|
|
|
standardattrs = sa.Table(
|
|
'standardattributes', sa.MetaData(),
|
|
sa.Column('id', sa.BigInteger(), primary_key=True, autoincrement=True),
|
|
sa.Column('resource_type', sa.String(length=255), nullable=False),
|
|
sa.Column('description', sa.String(length=255), nullable=True))
|
|
|
|
|
|
def upgrade():
|
|
generate_records_for_existing()
|
|
# add the constraint now that everything is populated on that table
|
|
op.alter_column(TABLE, 'standard_attr_id', nullable=False,
|
|
existing_type=sa.BigInteger(), existing_nullable=True,
|
|
existing_server_default=False)
|
|
op.create_unique_constraint(
|
|
constraint_name='uniq_%s0standard_attr_id' % TABLE,
|
|
table_name=TABLE, columns=['standard_attr_id'])
|
|
op.drop_column(TABLE, 'description')
|
|
op.create_foreign_key(
|
|
constraint_name=None, source_table=TABLE,
|
|
referent_table='standardattributes',
|
|
local_cols=['standard_attr_id'], remote_cols=['id'],
|
|
ondelete='CASCADE')
|
|
|
|
|
|
def generate_records_for_existing():
|
|
session = sa.orm.Session(bind=op.get_bind())
|
|
values = []
|
|
with session.begin(subtransactions=True):
|
|
for row in session.query(TABLE_MODEL):
|
|
# NOTE(kevinbenton): without this disabled, pylint complains
|
|
# about a missing 'dml' argument.
|
|
#pylint: disable=no-value-for-parameter
|
|
res = session.execute(
|
|
standardattrs.insert().values(resource_type=TABLE,
|
|
description=row[1])
|
|
)
|
|
session.execute(
|
|
TABLE_MODEL.update().values(
|
|
standard_attr_id=res.inserted_primary_key[0]).where(
|
|
TABLE_MODEL.c.id == row[0])
|
|
)
|
|
# this commit is necessary to allow further operations
|
|
session.commit()
|
|
return values
|