Extend the jbuilder api to support JSON API conventions

jbuilder.rb

class Jbuilder
  def links! model, *args
    args.each do |arg|
      if model.reflections[arg].collection?
        _set_value arg, model.send(arg).map(&:id)
      else
        _set_value arg, model.send(arg).id
      end
    end
  end
end

result.json

{
  "posts": [
    {
      "links": {
        "comments": [1,2,3,4,5],
        "user": 2,
        "tags": [30,31,32,33]
      }
    }
  ]
}

user.json.jbuilder

json.posts @posts do |post|
  json.links do
    json.links! post, :comments, :user, :tags
  end
end

Yes please!

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