The metadata method of the Resources model's arguments definition is not consistent with the request "show_resource_metadata" used.

[zhoutiekui]

The model defines three arguments:

The Request defines two arguments:

So if I use the model's metadata method,it encounts errors.

[seanhandley]

Thanks @zhoutiekui - that's an easy fix if you have time to raise a pull request? I can guide you through the process if you need any help.