Backwards-incompatible change -- Removed LazyDate helper class. To preserve existing functionality, query arguments can now be callable. Callable query arguments are evaluated with the query is evaluated.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4985 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -826,7 +826,9 @@ def parse_lookup(kwarg_items, opts):
             # Interpret '__exact=None' as the sql '= NULL'; otherwise, reject
             # all uses of None as a query value.
             if lookup_type != 'exact':
-                raise ValueError, "Cannot use None as a query value"
+                raise ValueError, "Cannot use None as a query value"      
+        elif callable(value):
+            value = value()
 
         joins2, where2, params2 = lookup_inner(path, lookup_type, value, opts, opts.db_table, None)
         joins.update(joins2)