# -*- coding: utf-8 -*-
###########################################################################
# Copyright (c), The AiiDA team. All rights reserved. #
# This file is part of the AiiDA code. #
# #
# The code is hosted on GitHub at https://github.com/aiidateam/aiida-core #
# For further information on the license, see the LICENSE.txt file #
# For further information please visit http://www.aiida.net #
###########################################################################
"""Add a unique constraint on the UUID column of the Node model
Revision ID: 62fe0d36de90
Revises: 59edaf8a8b79
Create Date: 2018-07-02 17:50:42.929382
"""
from alembic import op
# revision identifiers, used by Alembic.
revision = '62fe0d36de90'
down_revision = '59edaf8a8b79'
branch_labels = None
depends_on = None
[docs]def verify_node_uuid_uniqueness():
"""Check whether the database contains nodes with duplicate UUIDS.
Note that we have to redefine this method from aiida.manage.database.integrity.verify_node_uuid_uniqueness
because that uses the default database connection, while here the one created by Alembic should be used instead.
:raises: IntegrityError if database contains nodes with duplicate UUIDS.
"""
from alembic import op
from sqlalchemy.sql import text
from aiida.common.exceptions import IntegrityError
query = text(
'SELECT s.id, s.uuid FROM (SELECT *, COUNT(*) OVER(PARTITION BY uuid) AS c FROM db_dbnode) AS s WHERE c > 1')
conn = op.get_bind()
duplicates = conn.execute(query).fetchall()
if duplicates:
table = 'db_dbnode'
command = '`verdi database integrity detect-duplicate-uuid {table}`'.format(table)
raise IntegrityError('Your table "{}" contains entries with duplicate UUIDS.\nRun {} '
'to return to a consistent state'.format(table, command))
[docs]def upgrade():
verify_node_uuid_uniqueness()
op.create_unique_constraint('db_dbnode_uuid_key', 'db_dbnode', ['uuid'])
[docs]def downgrade():
op.drop_constraint('db_dbnode_uuid_key', 'db_dbnode')