code: def get_menu_checked(self, request):
          
          checked_id = []
          qd = request.GET
          query_dict = dict(qd.items())
          if query_dict:
              #object = get_object(**query_dict)
              app_label = query_dict['app_label']
              model_name = query_dict['model_name']
              pk = query_dict['pk']
              model = get_model(app_label, model_name)
              object =  model.objects.get(pk=pk)
              checked_id = object.menus_checked.split(',')
  
          return checked_id
docs: 获取用户或者用户组checked的菜单列表
          usermenu_form.html 中定义
          usermenu  这两个model的定义类似，比如menus_checked和menus_show
          groupmenu
          @return  eg. ['1', '8', '9', '10' ]
          获取用户或者用户组的check_ids,会给出app_label, model_name, pk eg. /easyui/menulistview/?app_label=easyui&model_name=UserMenu&pk=1