100 lines
3.7 KiB
Python
100 lines
3.7 KiB
Python
# Copyright 2016 NEC Technologies Limited
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#
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# 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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#
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from alembic import op
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import sqlalchemy as sa
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"""Add Name and Description to the networksegments table """
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# revision identifiers, used by Alembic.
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revision = '97c25b0d2353'
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down_revision = 'b12a3ef66e62'
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depends_on = ('89ab9a816d70',)
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# As this script depends on another migration which was a contract script,
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# therefore the following column addition ( which should have been in an
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# expand phase ) is also submitted in the contract phase. For information
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# about the expand and contract scripts and how the depends_on works, please
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# refer <https://docs.openstack.org/neutron/latest/contributor/
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# alembic_migrations.html#expand-and-contract-scripts>
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TBL = 'networksegments'
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TBL_MODEL = sa.Table(TBL, sa.MetaData(),
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sa.Column('id', sa.String(length=36), nullable=False),
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sa.Column('standard_attr_id', sa.BigInteger(),
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nullable=True))
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standardattrs = sa.Table(
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'standardattributes', sa.MetaData(),
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sa.Column('id', sa.BigInteger(), primary_key=True, autoincrement=True),
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sa.Column('resource_type', sa.String(length=255), nullable=False))
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def update_existing_records():
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session = sa.orm.Session(bind=op.get_bind())
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values = []
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with session.begin(subtransactions=True):
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for row in session.query(TBL_MODEL):
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# NOTE from kevinbenton: without this disabled, pylint complains
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# about a missing 'dml' argument.
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#pylint: disable=no-value-for-parameter
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res = session.execute(
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standardattrs.insert().values(resource_type=TBL)
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)
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session.execute(
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TBL_MODEL.update().values(
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standard_attr_id=res.inserted_primary_key[0]).where(
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TBL_MODEL.c.id == row[0])
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)
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# this commit is necessary to allow further operations
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session.commit()
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return values
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def upgrade():
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op.add_column(TBL, sa.Column('standard_attr_id', sa.BigInteger(),
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nullable=True))
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op.add_column(TBL,
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sa.Column('name', sa.String(255),
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nullable=True))
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update_existing_records()
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op.alter_column(TBL, 'standard_attr_id', nullable=False,
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existing_type=sa.BigInteger(), existing_nullable=True,
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existing_server_default=False)
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# add the constraint now that everything is populated on that table
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op.create_foreign_key(
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constraint_name=None, source_table=TBL,
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referent_table='standardattributes',
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local_cols=['standard_attr_id'], remote_cols=['id'],
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ondelete='CASCADE')
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op.create_unique_constraint(
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constraint_name='uniq_%s0standard_attr_id' % TBL,
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table_name=TBL, columns=['standard_attr_id'])
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def contract_creation_exceptions():
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"""
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Return create exceptions.
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These elements depend on the networksegments table which are added
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in the contract branch.
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"""
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return {
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sa.Column: ['networksegments.name',
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'networksegments.standard_attr_id'],
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}
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