Django admin隐藏编辑链接和添加删除操作

class RegistrationsAdmin(object):
    list_display = ['reg_user', 'network_ip', 'network_port', 'url']
    list_display_links = [""] #禁用编辑
    list_per_page = 20
    search_fields = ['reg_user', 'network_ip']
    #object_list_template = "model_list.html"

    def has_add_permission(self): # 禁用添加按钮
        return False
    def has_delete_permission(self):# 禁用删除按钮
        return False