Ticket #5247: patch_ticket5247_r11751.diff

django/forms/widgets.py

@@ -579 +579 @@
         final_attrs = self.build_attrs(attrs, name=name)
         output = [u'<ul>']
         # Normalize to strings
-        str_values = set([force_unicode(v) for v in value])
+        use_pk = value and hasattr(value[0], 'pk')
+        if use_pk:
+            # Assume we are using models if it's got a 'pk' attribute.
+            str_values = set([force_unicode(v.pk) for v in value])
+        else:
+            str_values = set([force_unicode(v) for v in value])
         for i, (option_value, option_label) in enumerate(chain(self.choices, choices)):
             # If an ID attribute was given, add a numeric index as a suffix,
             # so that the checkboxes don't all have the same ID attribute.