Ticket #1092: admin_form_defaults_via_GET.patch

django/contrib/admin/views/main.py

@@ -429 +432 @@
         # Add default data.
         new_data = manipulator.flatten_data()
 
-        # Override the defaults with request.GET, if it exists.
-        new_data.update(request.GET)
+        # Override the defaults with GET params, if they exist.
+        get_lists = request.GET.lists()
+        get_params = {}
+        for param_tuple in get_lists:
+            if len(param_tuple[1]) == 1:
+                get_params[param_tuple[0]] = param_tuple[1][0]
+            else:
+                get_params[param_tuple[0]] = param_tuple[1]
+
+        new_data.update(get_params)
+        
         errors = {}
 
     # Populate the FormWrapper.