Rails 3：在使用cancan的自动资源加载时，如何创建rspec控制器规格？

Question

I'm missing something here....

Cancan has a neat feature to automatically load your resources:

(taken from https://github.com/ryanb/cancan/wiki/Authorizing-Controller-Actions )

def index
  # @products automatically set to Product.accessible_by(current_ability)
end

Except I can't figure out how to get this to work in my rspec controller specs...

It's probably very simple and I'm just brain-frazzled at the moment. : P Anyway, it comes from cancan's load_and_authorize_resource function.

Ideas? Thanks!

Answer 1

The best way to test this controller is a stub the current_user method.

For instance, we have the Product model and Products controller.

class Product < ActiveRecord::Base 
end

class ProductsContoller < ApplicationController
  load_and_authorize_resource

  def index
  end

end

# allow access to Product only for admin user
class Ability
  include CanCan::Ability

  def initialize(user)

    user ||= User.new

    if user.admin?
      can :manage, Product
    end  

  end
end


# stubbing current_user method
module ControllersHelper
  def current_user!(user)
    raise "argument not valid" unless user.is_a?(User)
    controller.stub!(:current_user).and_return(user)
  end
end

# and include this method to rspec config
Spec::Runner.configure do |config|
  config.include ControllersHelper, :type => :controller
end


describe ProductsContoller do
  before do
    current_user!(user)
  end
  let(:user) { Factory(:user) }

  describe "GET index" do

    describe "for admin users" do
      before do
        user.update_attribute(:admin, true)
      end  

      it "should find .products tag" do
        get products_path
        response.should have_tag ".products"
      end  
    end  

    describe "for guest users" do
      it "should find .products tag" do
        get products_path
        response.should_not be_success
      end  
    end
  end
end