Dynamically marshalling specific fields support？

[imjustfly]

I have a problem when building a RESTful API service.Some on stackoverflow have the same problem

http://stackoverflow.com/questions/17306358/golang-removing-fields-from-struct-or-hiding-them-in-json-response

I'd now like to allow the caller to be able to select the specific fields they would like returned by passing in a "fields" GET parameter.

The JSON omitempty tag will not work in this case.But I think ffjson can do it by generating static MarshalJSON method with fields param and encoding partial fields to JSON string.

Wishing for your response :)