module BulletTrain::Api::Attributes

def api_attributes(api_version = BulletTrain::Api.current_version_numeric)
  controller = "Api::V#{api_version}::ApplicationController".constantize.new
  # TODO We need to fix host names here.
  controller.request = ActionDispatch::Request.new({})
  local_class_key = self.class.name.underscore.split("/").last.to_sym
  # Returns a hash, not string.
  JbuilderTemplate.new(controller.view_context) do |json|
    json.partial! "api/#{BulletTrain::Api.current_version}/#{self.class.name.underscore.pluralize}/#{local_class_key}", local_class_key => self
  end.attributes!
end