ruby-grape/grape-with-roar

module Acme
  module Api
    module Presenters
      module SplinePresenter
        include Roar::JSON::HAL
        include Roar::Hypermedia
        include Grape::Roar::Representer

        property :uuid, writeable: false, type: String, desc: 'Spline unique ID.'
        property :reticulated, type: Grape::API::Boolean, default: false, desc: 'True if spline is reticulated.'

        link :self do |opts|
          request = Grape::Request.new(opts[:env])
          "#{request.base_url}/api/splines/#{uuid}"
        end

        curies do |opts|
          request = Grape::Request.new(opts[:env])
          [
            name: :images,
            href: "#{request.base_url}/docs/splines/images/{rel}",
            templated: true
          ]
        end

        link 'images:thumbnail' do |opts|
          request = Grape::Request.new(opts[:env])
          "#{request.base_url}/api/splines/#{uuid}/images/thumbnail.jpg"
        end
      end
    end
  end
end