api is ignoring "only" configuration

[luizkowalski]

I have a serializer like this

class UserSerializer < ActiveModel::Serializer
  attributes :access_token, :first_name, :last_name
end

in one specific controller, I don't want to return first name and last name, so I've done this

class V1::Auth::AnonymousController < ApplicationController
  def create
    render json: User.create(activation_state: 'anonymous'), only: :access_token, status: 201
  end
end

in previous version (0.9.5) it was working, but when I updated to 0.10.0, it returns the first_name and last_name as empty values on the JSON

I'm using Ruby 2.3.1p112 with Rails 4.2.6

[groyoh]

You need to use the fields option instead of only e.g. render json: user, fields: [:access_token], status: 201. Seems like the docs are missing for this options, maybe you would be willing to create a PR for it?