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53 lines
1.7 KiB
Python
Vendored
53 lines
1.7 KiB
Python
Vendored
# -*- coding: utf-8 -*-
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#
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# Copyright © 2012 - 2013 Michal Čihař <michal@cihar.com>
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#
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# This file is part of Weblate <http://weblate.org/>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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'''
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Wrapper for Sum to work with PostgreSQL database.
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See also https://code.djangoproject.com/ticket/17564
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'''
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from django.conf import settings
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from django.db.models.aggregates import Sum
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from django.db.models.sql.aggregates import Sum as BaseSQLSum
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class SQLSum(BaseSQLSum):
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@property
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def sql_template(self):
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'''
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Adds type casting to boolean values for PostgreSQL.
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'''
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if (settings.DATABASES['default']['ENGINE']
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== 'django.db.backends.postgresql_psycopg2'):
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return '%(function)s(%(field)s::int)'
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return '%(function)s(%(field)s)'
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class BooleanSum(Sum):
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'''
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Sum for boolean fields.
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'''
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def add_to_query(self, query, alias, col, source, is_summary):
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'''
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Generates query to use SQLSum class with type casting.
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'''
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aggregate = SQLSum(
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col, source=source, is_summary=is_summary, **self.extra
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)
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query.aggregates[alias] = aggregate
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