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You ll often need to add a customized PHP snippet within a model file or to inject something into the view.phtml files to work with your template. This would require changing files within /app/code/core/. You want to avoid making changes in those directories because when you perform a Magento upgrade, these files will be overwritten. But never fear; there is a clean approach to modifying Magento s core files.

As with the publisher administration interface, we use scaffolding to create the controller, model, and view files by executing the generate script: $ script/generate scaffold Book 'admin/book'

Once you have selected which product you want to create, you will be presented with a blank version of the product details page, as shown in Figure 4-18. You will need to fill out any information that is required before you can create the product. Required information is notated with an orange star. Don t worry if you miss any information, if you attempt to save the product with missing information, Magento will provide you with an alert and notification or what information is missing.

For example, our hello function might require a name, but allow us to (optionally) specify the greeting and the punctuation: def hello_4(name, greeting='Hello', punctuation='!'): print '%s, %s%s' % (greeting, name, punctuation) This function can be called in many ways. Here are some of them:

exists exists create exists dependency exists exists exists skip skip skip create create create create create create create create create create

Figure 4-18. Creating a new product.Provide all information relevant to the product you are creating. For more information on how to work with products, refer to 5.

app/controllers/admin app/helpers/admin app/views/admin/book test/functional/admin model app/models/ test/unit/ test/fixtures/ app/models/book.rb test/unit/book_test.rb test/fixtures/books.yml app/views/admin/book/_form.rhtml app/views/admin/book/list.rhtml app/views/admin/book/show.rhtml app/views/admin/book/new.rhtml app/views/admin/book/edit.rhtml app/controllers/admin/book_controller.rb test/functional/admin/book_controller_test.rb app/helpers/admin/book_helper.rb app/views/layouts/book.rhtml public/stylesheets/scaffold.css

>>> hello_4('Mars') Hello, Mars! >>> hello_4('Mars', 'Howdy') Howdy, Mars! >>> hello_4('Mars', 'Howdy', '...') Howdy, Mars... >>> hello_4('Mars', punctuation='.') Hello, Mars. >>> hello_4('Mars', greeting='Top of the morning to ya') Top of the morning to ya, Mars! >>> hello_4() Traceback (most recent call last): File "<pyshell#64>", line 1, in hello_4() TypeError: hello_4() takes at least 1 argument (0 given)

Categories allow you to give your store structure and form. Magento s category structure works differently than most. Each Magento store you create is assigned a unique Root category. Any other category that you want to use in your store must be created as a sub-category, even though all categories are considered sub-categories because you are placing them under the Root category. If you want a specific category to appear in your top-level navigation you will need to make sure you make that category an anchor category. Anchor categories will display in the top navigation and display any subcategories which are assigned below the specified anchor category. The only problem with anchored categories is that you have a limited amount of horizontal space, so you are limited to the number of categories you can choose to anchor, as shown in Figure 4-19. The break down looks something like the following: Root Category Toys (anchored category) Toy Category 1 Toy Category 2

You can delete the public/stylesheets/scaffold.css file, because you already have a style sheet. Note that the generated functional test will fail if you execute it. You can decide whether to keep it or delete it, but we deleted it by executing the following command: $ rm test/functional/admin/book_controller_test.rb Now we ll introduce you to integration tests, which we ll use to test the front-end instead of functional tests.

Note If I had given name a default value as well, the last example wouldn t have raised an exception.

Tip Creating a root category will not place it in the main navigation. You must select the Is Anchor drop down