Fix sum of boolean fields for postgresql

trans/boolean_sum.py

@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright © 2012 - 2013 Michal Čihař <michal@cihar.com>
+#
+# This file is part of Weblate <http://weblate.org/>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+'''
+Wrapper for Sum to work with PostgreSQL database.
+
+See also https://code.djangoproject.com/ticket/17564
+'''
+from django.conf import settings
+from django.db.models.aggregates import Sum
+from django.db.models.sql.aggregates import Sum as BaseSQLSum
+
+
+class SQLSum(BaseSQLSum):
+    @property
+    def sql_template(self):
+        '''
+        Adds type casting to boolean values for PostgreSQL.
+        '''
+        if (settings.DATABASES['default']['ENGINE']
+                == 'django.db.backends.postgresql_psycopg2'):
+            return '%(function)s(%(field)s::int)'
+        return '%(function)s(%(field)s)'
+
+
+class BooleanSum(Sum):
+    '''
+    Sum for boolean fields.
+    '''
+    def add_to_query(self, query, alias, col, source, is_summary):
+        '''
+        Generates query to use SQLSum class with type casting.
+        '''
+        aggregate = SQLSum(
+            col, source=source, is_summary=is_summary, **self.extra
+        )
+        query.aggregates[alias] = aggregate

trans/models/translation.py

@@ -42,6 +42,7 @@
 from trans.models.project import Project
 from trans.util import get_user_display, get_site_url, sleep_while_git_locked
 from trans.mixins import URLMixin
+from trans.boolean_sum import BooleanSum
 
 
 class TranslationManager(models.Manager):
@@ -616,10 +617,10 @@ def update_stats(self):
         # Grab stats
         stats = self.unit_set.aggregate(
             Sum('num_words'),
-            Sum('fuzzy'),
-            Sum('translated'),
-            Sum('has_failing_check'),
-            Sum('has_suggestion'),
+            BooleanSum('fuzzy'),
+            BooleanSum('translated'),
+            BooleanSum('has_failing_check'),
+            BooleanSum('has_suggestion'),
             Count('id'),
         )