Source code for aiida.backends.djsite.db.migrations.0014_add_node_uuid_unique_constraint

# -*- coding: utf-8 -*-
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# 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
"""Add a uniqueness constraint to the uuid column of DbNode table."""

from django.db import migrations, models
from aiida.backends.djsite.db.migrations import upgrade_schema_version
from aiida.common.utils import get_new_uuid

REVISION = '1.0.14'
DOWN_REVISION = '1.0.13'


[docs]def verify_node_uuid_uniqueness(apps, schema_editor): """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 the migrations.RunPython command that will invoke this function, will pass two arguments and therefore this wrapper needs to have a different function signature. :raises: IntegrityError if database contains nodes with duplicate UUIDS. """ from aiida.manage.database.integrity.duplicate_uuid import verify_uuid_uniqueness verify_uuid_uniqueness(table='db_dbnode')
[docs]def reverse_code(apps, schema_editor): pass
[docs]class Migration(migrations.Migration): """Add a uniqueness constraint to the uuid column of DbNode table.""" dependencies = [ ('db', '0013_django_1_8'), ] operations = [ migrations.RunPython(verify_node_uuid_uniqueness, reverse_code=reverse_code), migrations.AlterField( model_name='dbnode', name='uuid', field=models.CharField(max_length=36, default=get_new_uuid, unique=True), ), upgrade_schema_version(REVISION, DOWN_REVISION) ]