post_url failed to generate from {:controller=>"posts", :action=>"show", :id=>#<Post id: 45, title: "Testowy wpis", body: "Lorem ipsum dolor sit amet, consectetur adipiscing ...", created_at: "2009-06-23 10:28:45", updated_at: "2009-06-23 10:28:45">}, expected: {:controller=>"posts", :action=>"show"}, diff: {:id=>#<Post id: 45, title: "Testowy wpis", body: "Lorem ipsum dolor sit amet, consectetur adipiscing ...", created_at: "2009-06-23 10:28:45", updated_at: "2009-06-23 10:28:45">}