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Flash (http://api.rubyonrails.org/classes/ActionController/Flash/FlashHash.html) is a clever mechanism in Rails (having nothing to do with Adobe/Macromedia Flash) for sending user notices and error messages from page to page. When we, for example, create a new author, it is a good idea to show the user a notice that the author was indeed created. Flash is a hash-like structure stored on the server for the time of one sequential action. It is available in both controllers and views. So when we set flash[:notice] in the create action and then redirect to the index action, the index page has access to the notice. If the user then clicks a link and goes on to another page, the notice has disappeared from the flash and the notice is not shown anymore. If you sometimes want to show a flash message in the current action so that it will not be available in the next action (for example, when a form input has been invalid and you want to rerender the form instead of redirecting to the next action), you should use flash.now instead of flash. It will cause the message to be cleaned up immediately after the current action has been processed.

Note Release info such as stability settings of Alpha, Beta, and Stable are set by extension owners and

Note If you ve been paying close attention, you noticed the sidebar in 1, Sneak Peek: The if Statement, which describes the if statement. I haven t really introduced it formally until now, and as you ll see, there is a bit more to it than what I ve told you so far.

Here, we first test that there are no authors in the test database. Then we try to create a new author by simulating the HTTP POST method sending a form to the create action. We expect that Rails responds to the POST request by redirecting us to the index page. We also want to make sure that a new Author object is created and that Rails sets the flash[:notice] variable correctly. However, the test code is not really beautiful. Instead of checking the exact amount of authors before and after running the create action, we only want to know that the amount was incremented by one. Fortunately, the chaps at projectionist (http://project.ioni.st/) have created a helper assertion method for testing just that (http://project.ioni.st/post/ 218#post-218). Open test/test_helper.rb in a text editor and add the following code to it: def assert_difference(object, method, difference=1) initial_value = object.send(method) yield assert_equal initial_value + difference, object.send(method) end def assert_no_difference(object, method, &block) assert_difference object, method, 0, &block end

The Magento Connect Manager has a convenient link to its public Magneto Connect site (www.magentocommerce.com/magento-connect). As of this writing, Magento Connect is broken up into three types of extensions: Community, Commercial, and Core. Community extension: This extension is free to the masses, built by the open source community, and released under the Open Source License 3.0. All extensions are labeled Provided as is . Commercial extension: This is a paid extension that will link to external sites. Be sure to read the reviews before purchasing to make sure it meets your needs and works in your environment and version. Core extension: This extension has been blessed by the Magento team (built by the same set of developers). It is also released under the Open Source License.

Browse the huge repository of extensions, read their reviews and ratings, and follow the forum discussions. There s a lot to see and do in Magento Connect.

Tip test/test_helper.rb is a file where you can define helper methods that are available to all tests.

The following values are considered by the interpreter to mean false: False None 0 "" () [] {}

Before you continue, we want to remind you to back up your system. There is no rollback option for extensions. Although you can uninstall an extension, it might not undo any database changes or file structure modifications.

A helper method can be a custom assertion like above, or any other method that makes writing actual tests easier and cleaner.