Fixed #10132 -- Corrected the interaction of extra() queries with the values() clause. Thanks to Glen Maynard for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9838 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -698,7 +698,7 @@ class QuerySet(object):
         Prepare the query for computing a result that contains aggregate annotations.
         """
         opts = self.model._meta
-        if not self.query.group_by:
+        if self.query.group_by is None:
             field_names = [f.attname for f in opts.fields]
             self.query.add_fields(field_names, False)
             self.query.set_group_by()
@@ -736,6 +736,7 @@ class ValuesQuerySet(QuerySet):
         aggregate_names = self.query.aggregate_select.keys()
 
         names = extra_names + field_names + aggregate_names
+
         for row in self.query.results_iter():
             yield dict(zip(names, row))
 

django/db/models/sql/query.py

@@ -68,7 +68,7 @@ class BaseQuery(object):
         self.tables = []    # Aliases in the order they are created.
         self.where = where()
         self.where_class = where
-        self.group_by = []
+        self.group_by = None
         self.having = where()
         self.order_by = []
         self.low_mark, self.high_mark = 0, None  # Used for offset/limit
@@ -177,7 +177,10 @@ class BaseQuery(object):
         obj.tables = self.tables[:]
         obj.where = deepcopy(self.where)
         obj.where_class = self.where_class
-        obj.group_by = self.group_by[:]
+        if self.group_by is None:
+            obj.group_by = None
+        else:
+            obj.group_by = self.group_by[:]
         obj.having = deepcopy(self.having)
         obj.order_by = self.order_by[:]
         obj.low_mark, obj.high_mark = self.low_mark, self.high_mark
@@ -272,7 +275,7 @@ class BaseQuery(object):
         # If there is a group by clause, aggregating does not add useful
         # information but retrieves only the first row. Aggregate
         # over the subquery instead.
-        if self.group_by:
+        if self.group_by is not None:
             from subqueries import AggregateQuery
             query = AggregateQuery(self.model, self.connection)
 
@@ -379,8 +382,8 @@ class BaseQuery(object):
                 result.append('AND')
             result.append(' AND '.join(self.extra_where))
 
-        if self.group_by:
-            grouping = self.get_grouping()
+        grouping = self.get_grouping()
+        if grouping:
             if ordering:
                 # If the backend can't group by PK (i.e., any database
                 # other than MySQL), then any fields mentioned in the
@@ -698,13 +701,15 @@ class BaseQuery(object):
         """
         qn = self.quote_name_unless_alias
         result = []
-        for col in self.group_by + self.related_select_cols:
-            if isinstance(col, (list, tuple)):
-                result.append('%s.%s' % (qn(col[0]), qn(col[1])))
-            elif hasattr(col, 'as_sql'):
-                result.append(col.as_sql(qn))
-            else:
-                result.append(str(col))
+        if self.group_by is not None:
+            group_by = self.group_by or []
+            for col in group_by + self.related_select_cols + self.extra_select.keys():
+                if isinstance(col, (list, tuple)):
+                    result.append('%s.%s' % (qn(col[0]), qn(col[1])))
+                elif hasattr(col, 'as_sql'):
+                    result.append(col.as_sql(qn))
+                else:
+                    result.append(str(col))
         return result
 
     def get_ordering(self):
@@ -1224,7 +1229,7 @@ class BaseQuery(object):
             # Aggregate references a normal field
             field_name = field_list[0]
             source = opts.get_field(field_name)
-            if not (self.group_by and is_summary):
+            if not (self.group_by is not None and is_summary):
                 # Only use a column alias if this is a
                 # standalone aggregate, or an annotation
                 col = (opts.db_table, source.column)
@@ -1816,6 +1821,7 @@ class BaseQuery(object):
         primary key, and the query would be equivalent, the optimization
         will be made automatically.
         """
+        self.group_by = []
         if self.connection.features.allows_group_by_pk:
             if len(self.select) == len(self.model._meta.fields):
                 self.group_by.append('.'.join([self.model._meta.db_table,

tests/regressiontests/aggregation_regress/models.py

@@ -200,6 +200,13 @@ FieldError: Cannot resolve keyword 'foo' into field. Choices are: authors, conta
 >>> sorted([(b.name, b.authors__age__avg, b.publisher.name, b.contact.name) for b in books])
 [(u'Artificial Intelligence: A Modern Approach', 51.5, u'Prentice Hall', u'Peter Norvig'), (u'Practical Django Projects', 29.0, u'Apress', u'James Bennett'), (u'Python Web Development with Django', 30.3..., u'Prentice Hall', u'Jeffrey Forcier'), (u'Sams Teach Yourself Django in 24 Hours', 45.0, u'Sams', u'Brad Dayley')]
 
+# Regression for #10132 - If the values() clause only mentioned extra(select=) columns, those columns are used for grouping
+>>> Book.objects.extra(select={'pub':'publisher_id'}).values('pub').annotate(Count('id')).order_by('pub')
+[{'pub': 1, 'id__count': 2}, {'pub': 2, 'id__count': 1}, {'pub': 3, 'id__count': 2}, {'pub': 4, 'id__count': 1}]
+
+>>> Book.objects.extra(select={'pub':'publisher_id','foo':'pages'}).values('pub').annotate(Count('id')).order_by('pub')
+[{'pub': 1, 'id__count': 2}, {'pub': 2, 'id__count': 1}, {'pub': 3, 'id__count': 2}, {'pub': 4, 'id__count': 1}]
+
 # Regression for #10199 - Aggregate calls clone the original query so the original query can still be used
 >>> books = Book.objects.all()
 >>> _ = books.aggregate(Avg('authors__age'))