collection.frj.jrb

{
  href:     services_path,
  id:       services_url,
  version:  resources.max(:updated_at),
  count:    resources.size,
  members:  render(:rfj => resources)
}

jrb_template_handler.rb

require 'yajl'

module Jrb

  class TemplateHandler < ActionView::Template::Handler
    include ActionView::Template::Handlers::Compilable

    ActionView::Template.register_template_handler(:jrb, self)

    self.default_format = Mime::JSON

    def compile(template)
      template.source
    end
  end

  ::ActionController::Renderers.add(:rfj_collection) do |resources, options|
    output = render("shared/collection", :locals => { :resources => resources })
    output = Yajl::Encoder.encode(output, :pretty => true)
    self.response_body = output
  end

  ::ActionController::Renderers.add(:rfj) do |resource, options|
    options[:partial] = resource
    options.delete(:layout)

    output = JrbPartialRenderer.new(self.view_context, options, nil).render

    # If we got a set of resources, we're being rendered inside a collection,
    # so just return the results and let the collection renderer handle the rest
    return output if resource.is_a?(Array)

    output = Yajl::Encoder.encode(output, :pretty => true)
    self.response_body = output
  end

  class JrbPartialRenderer < ActionView::Partials::PartialRenderer

    def render_collection
      return nil if @collection.blank?

      if @options.key?(:spacer_template)
        spacer = find_template(@options[:spacer_template]).render(@view, @locals)
      end

      result = @template ? collection_with_template : collection_without_template
      # skip forcing the result into a sting
      #result.join(spacer).html_safe
    end

    def find_template(path=@path)
      return path unless path.is_a?(String)
      prefix = @view.controller_path unless path.include?(?/)

      # Actually, pretend we're not a partial, so we don't use underscored templates
      @view.find_template(path, prefix, false)

    end

  end

end

services_controller.rb

class ServicesController < ApplicationController

  def index
    @services = Service.all

    render :rfj_collection => @services
  end

  def show
    @service = Service.find(:first)

    render :rfj => @service
  end
end