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The information Ruby on Rails needs for connecting to the database is located in a configuration file that is written in a lightweight markup language called YAML, an acronym for YAML Ain t Markup Language. Ruby on Rails favors YAML over XML because YAML is both easier to read and write than XML. The configuration file, database.yml, is located in the db folder and was created for you when you ran the rails command earlier in this chapter. The generated configuration template contains examples for MySQL, PostgreSQL, and SQLite. The MySQL configuration is enabled by default, and the other two database configurations are commented out. Open the file and specify the database name and remove all of the text. Next, specify the database name, username, and password for the development and test environments, as shown in Listing 1-1. Listing 1-1. Emporium Database Configuration development: adapter: mysql database: emporium_development username: emporium password: hacked test: adapter: mysql database: emporium_test username: emporium password: hacked Save the configuration after you are finished editing it.

a Web search should turn up a wealth of information. A brief history of various solutions may be found at http://www.cit.gu.edu.au/~sosic/nqueens.html.

// Prepare data $order_increment_id = '200000001'; // Using Zend XML-RPC $results = $client->call('call', array($session_id, 'sales_order.cancel', array($order_increment_id))); // view results var_dump($results);

Tip The database configuration for each Rails environment is located in one file, database.yml. The runtime configuration for the development, test, and production environments are defined in separate configuration files. You can see the differences between the environments by comparing the development.rb, test.rb, and production.rb files, which can be found in the config/environments folder under the Rails application root. This is also where you should put the environment-specific configuration of your application.

In the sales order shipment set, you can create shipment orders and record-tracking numbers. The available methods are as follows: sales_order_shipment.list() sales_order_shipment.info() sales_order_shipment.create() sales_order_shipment.addComment() sales_order_shipment.addTrack() sales_order_shipment.removeTrack() sales_order_shipment.getCarriers()

According to our requirements, George should be able to assign tags to a book on the add book page. We ll modify the page and add an autocompletion field that uses the script.aculo.us JavaScript library, which we introduced in 5.

To represent a possible solution (or part of it), you can simply use a tuple (or a list, for that matter). Each element of the tuple indicates the position (that is, column) of the queen of the

Method: sales_order_shipment.list ($filters)

First, we ll modify the integration test and add a test that simulates George entering the tags Elvis, Thriller, and Cooking in the Tags field. Change the test_book_administration method in test/integration/book_test.rb as follows (changes are marked in bold): george = new_session_as(:george) george.add_book :tags => 'Ruby, Programming, Dummies', :book => { :title => 'Ruby for Dummies', :publisher_id => publisher.id, :author_ids => [author.id], :published_at => Time.now, :cover_image => fixture_file_upload('/books.yml', 'image/png'), :isbn => '123-123-123-X', :blurb => 'The best book released since "Eating for Dummies"', :page_count => 123, :price => 40.4 } The change adds the tags parameter, and the specified tags, to the request. This parameter will be used by the controller to tag the book. Note that we can t put it in the book hash, as that would make Rails try to assign a string to the tags attribute, which it expects to be an array of Tag objects. We want the test to fail in TDD fashion, but if you try to run it now, it will succeed. This is because we haven t yet added a check that verifies that the book was tagged.

Now, let s turn to the recursive part of the solution. When you have your base case covered, the recursive case may correctly assume (by induction) that all results from lower levels (the queens with higher numbers) are correct. So what you have to do is add an else clause to the if statement in the previous implementation of the queens function.

Description: Returns a list of sales order shipments. Return: Array. Argument: $filters (optional). Uses an array of key/value pairs to set filters.