Fixed #8510 -- Allow both strings (mostly for the admin) and integers to be

used in "month" and "day" filters on date/datetime fields. Without this commit,
SQLite behaved inconsistently after [8494].


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8526 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/fields/__init__.py

@@ -568,6 +568,13 @@ class DateField(Field):
         else:
             return self.editable or self.auto_now or self.auto_now_add
 
+    def get_db_prep_lookup(self, lookup_type, value):
+        # For "__month" and "__day" lookups, convert the value to a string so
+        # the database backend always sees a consistent type.
+        if lookup_type in ('month', 'day'):
+            return [force_unicode(value)]
+        return super(DateField, self).get_db_prep_lookup(lookup_type, value)
+
     def get_db_prep_value(self, value):
         # Casts dates into the format expected by the backend
         return connection.ops.value_to_db_date(self.to_python(value))

tests/regressiontests/model_regress/models.py

@@ -57,7 +57,7 @@ u''
 >>> len(a4.article_text)
 5000
 
-# #659 regression test
+# Regression test for #659
 >>> import datetime
 >>> p = Party.objects.create(when = datetime.datetime(1999, 12, 31))
 >>> p = Party.objects.create(when = datetime.datetime(1998, 12, 31))
@@ -71,6 +71,14 @@ u''
 >>> [p.when for p in Party.objects.filter(when__year=1998)]
 [datetime.date(1998, 12, 31)]
 
+# Regression test for #8510
+>>> [p.when for p in Party.objects.filter(when__day='31')]
+[datetime.date(1999, 12, 31), datetime.date(1998, 12, 31)]
+>>> [p.when for p in Party.objects.filter(when__month='12')]
+[datetime.date(1999, 12, 31), datetime.date(1998, 12, 31)]
+>>> [p.when for p in Party.objects.filter(when__year='1998')]
+[datetime.date(1998, 12, 31)]
+
 # Check that get_next_by_FIELD and get_previous_by_FIELD don't crash when we
 # have usecs values stored on the database
 #