Fixed #10256 -- Corrected the interaction of extra(select=) with valu…

…es() and values_list() where an explicit list of columns is requested.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9837 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -727,12 +727,15 @@ def __init__(self, *args, **kwargs):
         # names of the model fields to select.
 
     def iterator(self):
-        if (not self.extra_names and
-            len(self.field_names) != len(self.model._meta.fields)):
+        # Purge any extra columns that haven't been explicitly asked for
+        if self.extra_names is not None:
             self.query.trim_extra_select(self.extra_names)
-        names = self.query.extra_select.keys() + self.field_names
-        names.extend(self.query.aggregate_select.keys())
 
+        extra_names = self.query.extra_select.keys()
+        field_names = self.field_names
+        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))
 
@@ -745,29 +748,30 @@ def _setup_query(self):
         instance.
         """
         self.query.clear_select_fields()
-        self.extra_names = []
-        self.aggregate_names = []
 
         if self._fields:
+            self.extra_names = []
+            self.aggregate_names = []
             if not self.query.extra_select and not self.query.aggregate_select:
-                field_names = list(self._fields)
+                self.field_names = list(self._fields)
             else:
-                field_names = []
+                self.query.default_cols = False
+                self.field_names = []
                 for f in self._fields:
                     if self.query.extra_select.has_key(f):
                         self.extra_names.append(f)
                     elif self.query.aggregate_select.has_key(f):
                         self.aggregate_names.append(f)
                     else:
-                        field_names.append(f)
+                        self.field_names.append(f)
         else:
             # Default to all fields.
-            field_names = [f.attname for f in self.model._meta.fields]
+            self.extra_names = None
+            self.field_names = [f.attname for f in self.model._meta.fields]
+            self.aggregate_names = None
 
         self.query.select = []
-        self.query.add_fields(field_names, False)
-        self.query.default_cols = False
-        self.field_names = field_names
+        self.query.add_fields(self.field_names, False)
 
     def _clone(self, klass=None, setup=False, **kwargs):
         """
@@ -817,21 +821,33 @@ def as_sql(self):
 
 class ValuesListQuerySet(ValuesQuerySet):
     def iterator(self):
-        self.query.trim_extra_select(self.extra_names)
+        if self.extra_names is not None:
+            self.query.trim_extra_select(self.extra_names)
         if self.flat and len(self._fields) == 1:
             for row in self.query.results_iter():
                 yield row[0]
         elif not self.query.extra_select and not self.query.aggregate_select:
             for row in self.query.results_iter():
                 yield tuple(row)
         else:
-            # When extra(select=...) is involved, the extra cols come are
-            # always at the start of the row, so we need to reorder the fields
+            # When extra(select=...) or an annotation is involved, the extra cols are
+            # always at the start of the row, and we need to reorder the fields
             # to match the order in self._fields.
-            names = self.query.extra_select.keys() + self.field_names + self.query.aggregate_select.keys()
+            extra_names = self.query.extra_select.keys()
+            field_names = self.field_names
+            aggregate_names = self.query.aggregate_select.keys()
+            names = extra_names + field_names + aggregate_names
+
+            # If a field list has been specified, use it. Otherwise, use the
+            # full list of fields, including extras and aggregates.
+            if self._fields:
+                fields = self._fields
+            else:
+                fields = names
+
             for row in self.query.results_iter():
                 data = dict(zip(names, row))
-                yield tuple([data[f] for f in self._fields])
+                yield tuple([data[f] for f in fields])
 
     def _clone(self, *args, **kwargs):
         clone = super(ValuesListQuerySet, self)._clone(*args, **kwargs)

tests/regressiontests/aggregation_regress/models.py

@@ -91,7 +91,7 @@ def __unicode__(self):
 >>> sorted(Book.objects.all().annotate(mean_auth_age=Avg('authors__age')).extra(select={'manufacture_cost' : 'price * .5'}).values().get(pk=2).items())
 [('contact_id', 3), ('id', 2), ('isbn', u'067232959'), ('manufacture_cost', ...11.545...), ('mean_auth_age', 45.0), ('name', u'Sams Teach Yourself Django in 24 Hours'), ('pages', 528), ('price', Decimal("23.09")), ('pubdate', datetime.date(2008, 3, 3)), ('publisher_id', 2), ('rating', 3.0)]
 
-# The order of the values, annotate and extra clauses doesn't matter
+# The order of the (empty) values, annotate and extra clauses doesn't matter
 >>> sorted(Book.objects.all().values().annotate(mean_auth_age=Avg('authors__age')).extra(select={'manufacture_cost' : 'price * .5'}).get(pk=2).items())
 [('contact_id', 3), ('id', 2), ('isbn', u'067232959'), ('manufacture_cost', ...11.545...), ('mean_auth_age', 45.0), ('name', u'Sams Teach Yourself Django in 24 Hours'), ('pages', 528), ('price', Decimal("23.09")), ('pubdate', datetime.date(2008, 3, 3)), ('publisher_id', 2), ('rating', 3.0)]
 

tests/regressiontests/extra_regress/models.py

@@ -30,6 +30,11 @@ class Order(models.Model):
     created_by = models.ForeignKey(User)
     text = models.TextField()
 
+class TestObject(models.Model):
+    first = models.CharField(max_length=20)
+    second = models.CharField(max_length=20)
+    third = models.CharField(max_length=20)
+
 __test__ = {"API_TESTS": """
 # Regression tests for #7314 and #7372
 
@@ -115,4 +120,75 @@ class Order(models.Model):
 # cause incorrect SQL to be produced otherwise.
 >>> RevisionableModel.objects.extra(select={"the_answer": 'id'}).dates('when', 'month')
 [datetime.datetime(2008, 9, 1, 0, 0)]
+
+# Regression test for #10256... If there is a values() clause, Extra columns are
+# only returned if they are explicitly mentioned.
+>>> TestObject(first='first', second='second', third='third').save()
+
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values()
+[{'bar': u'second', 'third': u'third', 'second': u'second', 'whiz': u'third', 'foo': u'first', 'id': 1, 'first': u'first'}]
+
+# Extra clauses after an empty values clause are still included
+>>> TestObject.objects.values().extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third'))))
+[{'bar': u'second', 'third': u'third', 'second': u'second', 'whiz': u'third', 'foo': u'first', 'id': 1, 'first': u'first'}]
+
+# Extra columns are ignored if not mentioned in the values() clause
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values('first', 'second')
+[{'second': u'second', 'first': u'first'}]
+
+# Extra columns after a non-empty values() clause are ignored
+>>> TestObject.objects.values('first', 'second').extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third'))))
+[{'second': u'second', 'first': u'first'}]
+
+# Extra columns can be partially returned
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values('first', 'second', 'foo')
+[{'second': u'second', 'foo': u'first', 'first': u'first'}]
+
+# Also works if only extra columns are included
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values('foo', 'whiz')
+[{'foo': u'first', 'whiz': u'third'}]
+
+# Values list works the same way
+# All columns are returned for an empty values_list()
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list()
+[(u'first', u'second', u'third', 1, u'first', u'second', u'third')]
+
+# Extra columns after an empty values_list() are still included
+>>> TestObject.objects.values_list().extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third'))))
+[(u'first', u'second', u'third', 1, u'first', u'second', u'third')]
+
+# Extra columns ignored completely if not mentioned in values_list()
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('first', 'second')
+[(u'first', u'second')]
+
+# Extra columns after a non-empty values_list() clause are ignored completely
+>>> TestObject.objects.values_list('first', 'second').extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third'))))
+[(u'first', u'second')]
+
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('second', flat=True)
+[u'second']
+
+# Only the extra columns specified in the values_list() are returned
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('first', 'second', 'whiz')
+[(u'first', u'second', u'third')]
+
+# ...also works if only extra columns are included
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('foo','whiz')
+[(u'first', u'third')]
+
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('whiz', flat=True)
+[u'third']
+
+# ... and values are returned in the order they are specified
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('whiz','foo')
+[(u'third', u'first')]
+
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('first','id')
+[(u'first', 1)]
+
+>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('whiz', 'first', 'bar', 'id')
+[(u'third', u'first', u'second', 1)]
+
 """}
+
+