magic-removal: Added 'core_filters' attribute to Manager -- a dictionary of core filters to apply to every database query made with that manager.

git-svn-id: http://code.djangoproject.com/svn/django/branches/magic-removal@2140 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/manager.py

@@ -26,6 +26,9 @@ class Manager(object):
     # Tracks each time a Manager instance is created. Used to retain order.
     creation_counter = 0
 
+    # Dictionary of lookup parameters to apply to every _get_sql_clause().
+    core_filters = {}
+
     def __init__(self):
         # Increase the creation counter, and save our local copy.
         self.creation_counter = Manager.creation_counter
@@ -56,6 +59,9 @@ class Manager(object):
 
         opts = self.klass._meta
 
+        # Apply core filters.
+        kwargs.update(self.core_filters)
+
         # Construct the fundamental parts of the query: SELECT X FROM Y WHERE Z.
         select = ["%s.%s" % (backend.quote_name(opts.db_table), backend.quote_name(f.column)) for f in opts.fields]
         tables = (kwargs.get('tables') and [quote_only_if_word(t) for t in kwargs['tables']] or [])