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51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
# -*- coding:utf-8 -*
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#
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# Copyright 2016,2017
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# - Sli <antoine@bartuccio.fr>
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#
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# Ce fichier fait partie du site de l'Association des Étudiants de l'UTBM,
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# http://ae.utbm.fr.
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License a published by the Free Software
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# Foundation; either version 3 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Sofware Foundation, Inc., 59 Temple
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# Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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#
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"""
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This page is useful for custom migration tricks.
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Sometimes, when you need to have a migration hack and you think it can be
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useful again, put it there, we never know if we might need the hack again.
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"""
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from django.db import connection, migrations
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class PsqlRunOnly(migrations.RunSQL):
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"""
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This is an SQL runner that will launch the given command only if
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the used DBMS is PostgreSQL.
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It may be useful to run Postgres' specific SQL, or to take actions
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that would be non-senses with backends other than Postgre, such
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as disabling particular constraints that would prevent the migration
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to run successfully.
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See `club/migrations/0010_auto_20170912_2028.py` as an example.
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Some explanations can be found here too:
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https://stackoverflow.com/questions/28429933/django-migrations-using-runpython-to-commit-changes
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"""
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def _run_sql(self, schema_editor, sqls):
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if connection.vendor == 'postgresql':
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super(PsqlRunOnly, self)._run_sql(schema_editor, sqls)
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