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Stubbing ActiveRecord dynamic finders with RSpec
class User < ActiveRecord::Base
  has_many :favorites
end

class Favorite < ActiveRecord::Base
  belongs_to :user
  belongs_to :place
end

class Place < ActiveRecord::Base
  has_many :favorites, :as => :favorable
end

@favorite = @current_user.favorites.find_by_place_id(@place.id)

it "should be success" do
  user = double("User")
  user.stub(:favorites)
  get :show, :id => "1081651"
  response.should be_success
end

undefined method `find_by_place_id' for nil:NilClass

user.stub(:favorites).and_return(double.as_null_object)

user.stub_chain(:favorites, :find_by_place_id)

favorite = double('Favorite')
user.stub_chain(:favorites, :find_by_place_id) { favorite }