class RestModel
  class Embeddable
    module Retriever
      def from_source(item, resource = nil)
        return handle_fields(item) if fields

        value = digg(item)
        parsed_value = raw? ? value : resource_class.from_source(value)
        one? ? parsed_value.first : parsed_value
      end

      def handle_fields(item)
        convert_input_keys.call(fields).map {|field| item[field]}
      end

      def digg(input)
        source_path.inject(input) {|buffer, key| buffer = buffer[key]}
      end
    end
  end
end