sketch for Matt Wynne

sketch.rb

class Organization
  def to_param
    "42"
  end
  def saved?
    rand > 0.5
  end
end


class Protocol
  class << self
    def message(name)
      @messages ||= []
      @messages << name
    end
    attr_reader :messages
  end

  def initialize(callbacks)
    @callbacks = callbacks
  end

  def method_missing(name, *args)
    super unless self.class.messages.include?(name)
    @callbacks[name].call(*args)
  end
end

class OrganizationCreator
  class Listener < Protocol
    message :success
    message :failure
  end

  def create_for(user, org_name, listener)
    # real creation logic here
    organization = Organization.new
    if organization.saved?
      listener.success(organization)
    else
      listener.failure(organization)
    end
  end
end

class OrganizationsController
  def create
    params = { organization: 'Hello' }
    creator = OrganizationCreator.new
    creator.create_for(current_user, params[:organization],
      OrganizationCreator::Listener.new(
        success: ->(org) { redirect_to organizations_path(org) },
        failure: ->(org) { render :error }
      )
    )
  end
private
  def redirect_to(path)
    puts "redirecting_to #{path}"
  end

  def render(renderable)
    puts "rendering #{renderable}"
  end
  def current_user
    Object.new
  end
  def organizations_path(org)
    "/organizations/#{org.to_param}"
  end
end

controller = OrganizationsController.new
controller.create

This is just an idea - please don't anybody copy it as though it were some kind of best practice!