Grape with Exposures

exposures.rb

require 'ostruct'
require 'grape-entity'
require 'active_support/concern'

module Exposable
  extend ActiveSupport::Concern

  # included do
  #   base = self
  # end

  module ClassMethods
    def exsposure_map *map
      # preprocess map
      build_entity map
    end

    def build_entity(map)
      const_set("Entity",  Class.new(Grape::Entity) do
                  map.each { |param|
                    send :expose, param
                  }
      end)
    end
  end


end


class Exposure
  include Exposable

  def initialize(me)
    @me = me
  end

  exsposure_map :minni

  def minni
    "mu"
  end
end


class GrapeFruit < Grape::API

  format :json

  class Soma < OpenStruct

    def mowgli
      "boom"
    end

    class Entity < Grape::Entity
      expose :frag
      expose :mag, as: :barre
      expose :bang
      # expose :mowgli
    end
  end


  resource "/:frag/:mag/" do
    desc "some fucsia"

    get "hallo" do
      frag = params[:frag]
      present Soma.new(params)
    end
  end

  resource :expo do

    get ":me" do
      present Exposure.new(params[:me])
    end
  end

end