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"No route matches" error?

I am new Rspec and just started by generating a new controller on Rails 3. It generates some Rspec tests by default. I have a question about how to make them pass though. As it stands, I see this test in my terminal"

1) BuildingsController GET 'show' should be successful

 Failure/Error: get 'show'
 No route matches {:controller=>"buildings", :action=>"show"}
 # ./spec/controllers/buildings_controller_spec.rb:17:in `block (3 levels) in <top (required)>'

However, I don't understand why it'开发者_C百科s coming up because I already have this route created ("resources :buildings"), and I ran rake routes and made sure it's there.

building GET /buildings/:id(.:format) {:action=>"show", :controller=>"buildings"}

What is necessary to make this pass? Here is the test by the way:

  describe "GET 'show'" do
    it "should be successful" do
      get 'show'
      response.should be_success
    end
  end


You need to pass id of existing building: get :show, :id => @building.id

Routes complain about it because :id isn't optional.

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