app_responder.rb

class AppResponder < ActionController::Responder
  include Responders::HttpCacheResponder
  include Responders::CollectionResponder
end

scatter_plots_controller.rb

class ScatterPlotsController < ApplicationController
  before_filter :parent
  before_filter :build_resource, :only => [:new, :create]
  before_filter :find_resource,  :only => [:edit, :update, :show, :destroy]
  before_filter :collection,     :only => [:index]

  def index
    respond_with(collection)
  end

  def new
    respond_with(resource)
  end

  def create
    resource.save
    respond_with(parent, resource)
  end

  def show
    respond_with(resource)
  end
	
  def update
    resource.update_attributes(params[:scatter_plot])
    respond_with(parent, resource)
  end
	
  def destroy
    resource.destroy
    respond_with(parent, resource)
  end

  protected
    def find_parent
      @survey = current_organization.surveys.find(params[:survey_id])
    end

    def parent
      @survey ||= find_parent
    end

    def find_resource
      @scatter_plot = parent.scatter_plots.find(params[:id])
    end

    def build_resource
      @scatter_plot = parent.scatter_plots.new(params[:scatter_plot])
    end

    def resource
      @scatter_plot ||= find_resource
    end
		
    def collection
      @scatter_plots ||= parent.scatter_plots
    end
end