class DocumentAdmin(admin.ModelAdmin):

    def change_view(self, request, object_id, extra_context={}):
        """
        save the referer of the page to return to the filtered
        change_list after saving the page
        """
        
        if len(extra_context) > 0:
            """ 
            second call of the form (after saving), take the
            referer from extra_context['ref'], clear extra_context 
            and put the referer in result['Location'] 
            """                        
            ref = extra_context['ref']            
            result = super(DocumentAdmin, self).change_view(request, object_id, extra_context.clear() )
            result['Location'] = ref            
        else:
            """ 
            first call of the form: add the referer to the context  
            """                       
            extra_context['ref'] = unicode( request.META.get('HTTP_REFERER', '') ) 
            result = super(DocumentAdmin, self).change_view(request, object_id, extra_context )
        return result

admin.site.register(Document, DocumentAdmin)