speakers_controller.rb

class SpeakersController < ApplicationController
  load_and_authorize_resource :event
  load_and_authorize_resource :speaker, through: [:event], shallow: true #the array here could only be the single symbol but since i almost always wind up adding more, i just start with it
  before_filter :new_speaker, :only => [:new, :create]
  respond_to :html

  def index
  end

  def show
  end

  def new
  end

  def edit
  end

  def create
    @event.speakers.new(speakers_params)
    @speaker.save 
    respond_with @speaker    
  end

  def update
    @speaker.update_attributes(speakers_params)
    respond_with @speaker
  end

  private

  def new_speaker
    @speaker = Speaker.new
  end

  def speakers_params
    params.require(:speaker).permit(:name, :title, :bio, :event_id)
  end

end

speakers_controller_spec.rb

require 'spec_helper'

describe SpeakersController do
  before :each do
    @event = create :event
    @speaker = create :speaker, event: @event
    login_admin
  end

  describe "before filters" do
    it "finds the speaker" do
      speaker = mock_model(Speaker)
      Speaker.should_receive(:find).and_return(speaker)
      controller.send(:find_speaker).should == speaker
    end

    it "assigns new speaker" do
      controller.send(:new_speaker).should be_a_new(Speaker)
    end

    it "finds the event" do
      event = mock_model(Event)
      Event.should_receive(:find).and_return(event)
      controller.send(:find_event).should == event
    end
  end

  describe "GET index" do
    it "assigns all speakers for event" do
      get :index, event_id: @event.id
      assigns(:speakers).should eq([@speaker])
    end
  end

  describe "GET show" do
    it "assigns the speaker" do
      get :show, event_id:  @event.id, id:  @speaker.id
      assigns(:speaker).should eq(@speaker)
    end
  end

  describe "GET new" do
    it "assigns a new speaker" do
      get :new, event_id: @event.id
      assigns(:speaker).should be_a_new(Speaker)
    end
  end

  describe "GET edit" do
    it "assigns the speaker" do
      get :edit, event_id:  @event.id, id:  @speaker.id
      assigns(:speaker).should eq(@speaker)
    end
  end

  describe "POST create" do
    describe "with valid params" do
      it "creates a new speaker" do
        expect {
          post :create, event_id: @event.id, speaker: FactoryGirl.attributes_for(:speaker)
        }.to change(Speaker, :count).by(1)
      end

      it "redirects to the created speaker page" do
        post :create, event_id: @event.id, speaker: FactoryGirl.attributes_for(:speaker)
        response.should be_redirect
      end
    end

    describe "with invalid params" do
      it "does not save speaker" do
        expect {
          post :create, event_id: @event.id, speaker: {name: ''}
        }.to_not change(Speaker, :count).by(1)
      end

      it "renders the 'new' template" do
        post :create, event_id: @event.id, speaker: {name: ''}
        response.should render_template :new
      end
    end
  end

  describe "PUT update" do
    describe "with valid params" do
      it "updates the speaker" do
        Speaker.any_instance.should_receive(:update_attributes).and_return(true)
        put :update, event_id: @event.id, id: @speaker.id, speaker: FactoryGirl.attributes_for(:speaker)
      end

      it "redirects to the speaker page" do
        put :update, event_id: @event.id, id: @speaker.id, speaker: FactoryGirl.attributes_for(:speaker)
        response.should be_redirect
      end
    end

    describe "with invalid params" do
      it "does not update the speaker" do
        Speaker.any_instance.should_receive(:update_attributes).and_return(false)
        put :update, event_id: @event.id, id: @speaker.id, speaker: {name: ''}
      end

      it "re-renders the 'edit' template" do
        put :update, event_id: @event.id, id: @speaker.id, speaker: {name: ''}
        response.should render_template :edit
      end
    end
  end
end