Ticket #2479: query_sum.diff

db/models/query.py

@@ -202 +202 @@
             cursor.execute("SELECT COUNT(*)" + sql, params)
         return cursor.fetchone()[0]
 
+    def sum(self, field):
+        "Performs a SELECT SUM(field) and returns the sum of the field as an integer."
+        counter = self._clone()
+        counter._order_by = ()
+        counter._offset = None
+        counter._limit = None
+        counter._select_related = False
+        select, sql, params = counter._get_sql_clause()
+        cursor = connection.cursor()
+        cursor.execute("SELECT SUM(%s)" % field + sql, params)
+        return cursor.fetchone()[0] # Type cast this to int or just leave as what the db gave us?
+
     def get(self, *args, **kwargs):
         "Performs the SELECT and returns a single object matching the given keyword arguments."
         clone = self.filter(*args, **kwargs)