# -*- 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 # ########################################################################### # pylint: disable=invalid-name,no-member """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 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 = f'`verdi database integrity detect-duplicate-uuid {table}`' raise IntegrityError( 'Your table "{}" contains entries with duplicate UUIDS.\nRun {} ' 'to return to a consistent state'.format(table, command) ) [docs]def upgrade(): """Migrations for the upgrade.""" verify_node_uuid_uniqueness() op.create_unique_constraint('db_dbnode_uuid_key', 'db_dbnode', ['uuid']) [docs]def downgrade(): """Migrations for the downgrade.""" op.drop_constraint('db_dbnode_uuid_key', 'db_dbnode')