Fixes #2993, Refs #2918 -- Reverted [3960]; [3960] fixed a potential data validation problem for SQLite, but broke usage of LazyDate. The proper fix is to complete the model validators to catch _all_ invalid inputs.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4105 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 2 insertions, 11 deletions

diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index bc1eaf0a6a..8e8d68aad5 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -457,9 +457,7 @@ class DateField(Field):
 
     def get_db_prep_save(self, value):
         # Casts dates into string format for entry into database.
-        if isinstance(value, datetime.datetime):
-            value = value.date().strftime('%Y-%m-%d')
-        elif isinstance(value, datetime.date):
+        if value is not None:
             value = value.strftime('%Y-%m-%d')
         return Field.get_db_prep_save(self, value)
 
@@ -489,19 +487,12 @@ class DateTimeField(DateField):
 
     def get_db_prep_save(self, value):
         # Casts dates into string format for entry into database.
-        if isinstance(value, datetime.datetime):
+        if value is not None:
             # MySQL will throw a warning if microseconds are given, because it
             # doesn't support microseconds.
             if settings.DATABASE_ENGINE == 'mysql' and hasattr(value, 'microsecond'):
                 value = value.replace(microsecond=0)
             value = str(value)
-        elif isinstance(value, datetime.date):
-            # MySQL will throw a warning if microseconds are given, because it
-            # doesn't support microseconds.
-            if settings.DATABASE_ENGINE == 'mysql' and hasattr(value, 'microsecond'):
-                value = datetime.datetime(value.year, value.month, value.day, microsecond=0)
-            value = str(value)
-            
         return Field.get_db_prep_save(self, value)
 
     def get_db_prep_lookup(self, lookup_type, value):