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Listing 10-13. Updated Test Case for the show Action in test/functional/articles_controller_test.rb: http://gist.github.com/358410 require 'test_helper' class ArticlesControllerTest < ActionController::TestCase setup do @article = articles(:welcome_to_rails) end test "should get index" do get :index assert_response :success assert_template 'index' assert_not_nil assigns(:articles) end test "should get new" do get :new assert_response :success end test "should create article" do assert_difference('Article.count') do post :create, :article => @article.attributes end assert_redirected_to article_path(assigns(:article)) end test "should show article" do get :show, :id => @article.to_param assert_response :success assert_template 'show' assert_not_nil assigns(:article) assert assigns(:article).valid end test "should get edit" do get :edit, :id => @article.to_param assert_response :success end test "should update article" do put :update, :id => @article.to_param, :article => @article.attributes assert_redirected_to article_path(assigns(:article)) end

Now that the sessions table has been created, we need to tell Rails that we want to use the database for session storage. This is matter of configuration, and is therefore specified in the config/environment.rb file. Open this file in your editor and you ll see the session configuration options are already there, though they re commented out.

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You can check that the database and user were created successfully by using the MySQL command-line client to access the mydiary database: ~/rails/mydiary $ mysql -u mydiary -p Enter password: <type mypassword at this point> Welcome to the MySQL monitor Commands end with ; or \g Your MySQL connection id is 12 to server version: 5027-standard Type 'help;' or '\h' for help Type '\c' to clear the buffer mysql> QUIT Bye If MySQL gives no error, generally everything is okay If you get an error saying that the username is invalid, then the granting of privileges in the prior section wasn t successful, so refer to any error messages that appeared at that point.

If you re using a GUI MySQL client or even a client for a totally different database system, make sure that you ve created a database called mydiary and made it accessible to a user Your client should allow you to test this easily Once the database has been created, you can tell your Rails application of its existence by editing the config/databaseyml file, covered in the main text in this section..

test "should destroy article" do assert_difference('Article.count', -1) do delete :destroy, :id => @article.to_param end assert_redirected_to articles_path end end The test "should show article" case is almost the same as test "should get index", but with one notable difference: you need to identify the record you want to show. If you were requesting this in a browser, the URL would look like /articles/1. Therefore, you need to pass in the :id parameter with a value of 1. If you look closely at the test request, you can see how this is done: get :show, :id => @article.to_param @article.to_param by default gets the id attribute of the :welcome_to_rails article you re getting from the fixtures that is assigned to the @article variable. You should always use the to_param method instead of id because it s the method Rails uses to generate URLs internally. You can pass arbitrary parameters in this fashion. You see more of this when you test the create and update actions, both of which require a set of article parameters. One more thing to notice here: you can treat the result of assigns(:article) as you would any Article object and call methods on it: assert assigns(:article).valid So, not only can you assert that there is an instance variable named @article, but you can also assert that it contains a valid Article object.

# Use the database for sessions instead of the file system # (create the session table with 'rake db:sessions:create') # config.action_controller.session_store = :active_record_store

C ha P ter 13 W eB a PP LI C a t I O N F r a M e W O r K S : r a I LS , S I N a t r a , a N D r a M a Z e

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