gistfile1.txt

# From http://blog.boochtek.com/2015/02/23/hexagonal-rails-controllers
class OrderController < ApplicationController

  def index
    interactor.on(:display) { |orders| render orders }
    interactor.list
  end

  def show
    interactor.on(:display) { |order| render order }
    interactor.on(:not_found) { |order_id| render status: 404 }
    interactor.get(params[:id])
  end

end


# Same thing, with callback API suggested by @adkron.
class OrderController < ApplicationController

  def index
    interactor.list do |on|
      on.display { |orders| render orders }
    end
  end

  def show
    interactor.get(params[:id]) do |on|
      on.display { |order| render order }
      on.not_found { |order_id| render status: 404 }
    end
  end

end

# Same thing, with callback API suggested by @adkron but return the response object instead of a block
class OrderController < ApplicationController

  def index
    on = interactor.list
    on.display { |orders| render orders }
  end

  def show
    on = interactor.get(params[:id])
    on.display { |order| render order }
    on.not_found { |order_id| render status: 404 }
  end

end

# Same thing, with callbacks using stabby lambdas as arguments.
class OrderController < ApplicationController

  def index
    interactor.list(
      display: ->(orders){ render orders }
    )
  end

  def show
    interactor.get(params[:id],
      display: ->(order) { render order },
      not_found: ->(order_id) { render status: 404 }
    )
  end

end