Fixed #7105 -- Fixed dates() queries in light of model inheritance.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7763 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -688,7 +688,7 @@ class DateQuerySet(QuerySet):
         """
         self.query = self.query.clone(klass=sql.DateQuery, setup=True)
         self.query.select = []
-        self.query.add_date_select(self._field.column, self._kind, self._order)
+        self.query.add_date_select(self._field, self._kind, self._order)
         if self._field.null:
             self.query.add_filter(('%s__isnull' % self._field.name, False))
 

django/db/models/sql/subqueries.py

@@ -357,12 +357,14 @@ class DateQuery(Query):
                     date = typecast_timestamp(str(date))
                 yield date
 
-    def add_date_select(self, column, lookup_type, order='ASC'):
+    def add_date_select(self, field, lookup_type, order='ASC'):
         """
         Converts the query into a date extraction query.
         """
-        alias = self.join((None, self.model._meta.db_table, None, None))
+        result = self.setup_joins([field.name], self.get_meta(),
-        select = Date((alias, column), lookup_type,
+                self.get_initial_alias(), False)
+        alias = result[3][-1]
+        select = Date((alias, field.column), lookup_type,
                 self.connection.ops.date_trunc_sql)
         self.select = [select]
         self.select_fields = [None]

tests/regressiontests/model_inheritance_regress/models.py

@@ -2,6 +2,8 @@
 Regression tests for Model inheritance behaviour.
 """
 
+import datetime
+
 from django.db import models
 
 class Place(models.Model):
@@ -10,7 +12,7 @@ class Place(models.Model):
 
     class Meta:
         ordering = ('name',)
-        
+
     def __unicode__(self):
         return u"%s the place" % self.name
 
@@ -35,11 +37,17 @@ class ParkingLot(Place):
     def __unicode__(self):
         return u"%s the parking lot" % self.name
 
+class Parent(models.Model):
+    created = models.DateTimeField(default=datetime.datetime.now)
+
+class Child(Parent):
+    name = models.CharField(max_length=10)
+
 __test__ = {'API_TESTS':"""
 # Regression for #7350, #7202
-# Check that when you create a Parent object with a specific reference to an existent
+# Check that when you create a Parent object with a specific reference to an
-# child instance, saving the Parent doesn't duplicate the child. 
+# existent child instance, saving the Parent doesn't duplicate the child. This
-# This behaviour is only activated during a raw save - it is mostly relevant to 
+# behaviour is only activated during a raw save - it is mostly relevant to
 # deserialization, but any sort of CORBA style 'narrow()' API would require a
 # similar approach.
 
@@ -117,4 +125,10 @@ __test__ = {'API_TESTS':"""
 >>> [sorted(d.items()) for d in dicts]
 [[('name', u"Guido's All New House of Pasta"), ('serves_gnocchi', False), ('serves_hot_dogs', False)]]
 
+# Regressions tests for #7105: dates() queries should be able to use fields
+# from the parent model as easily as the child.
+>>> obj = Child.objects.create(name='child', created=datetime.datetime(2008, 6, 26, 17, 0, 0))
+>>> Child.objects.dates('created', 'month')
+[datetime.datetime(2008, 6, 1, 0, 0)]
+
 """}