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Scaffolding creates some files that we don t need, including a style sheet and a layout file. Delete the public/stylesheets/scaffold.css file, as we already have a style sheet for Emporium. Also delete app/views/layouts/publisher.rhtml, as we want to use the same layout for all controllers. Now is a good time to start writing some tests. But wait, didn t the scaffolding script just create a functional test for us Let s execute the test with rake test:functionals. There are no errors and all tests pass. You could assume that you do not have to write any tests, but that assumption is wrong.

The while and for loops in Python are quite flexible, but every once in a while you may encounter a problem that makes you wish you had more functionality. For example, let s say you want to do something while a user enters words at a prompt, and you want to end the loop when no word is provided. One way of doing that would be word = 'dummy' while word: word = raw_input('Please enter a word: ') # do something with the word: print 'The word was ' + word Here is an example session: Please enter The word was Please enter The word was Please enter a word: first first a word: second second a word:

If you want to review your created package(s), you can click the last section labeled Load Local Package. You newly created extension will be displayed on the first row. Click the row and it will reload all your information for viewing.

The scaffolding script has created a functional test in test/functional/admin/publisher_ controller_test.rb. On closer inspection, we can see that it requires some modifications for it to be helpful in our efforts at producing bug-free code. For example, the test_create method doesn t specify a name for the publisher it creates. This should have made the test fail when we ran the test, but it didn t. We will fix that soon, but the first thing we will do is add validations. You never know what kind of data a user will try to enter into your application. As explained in the previous chapter, validations help ensure that only valid data is inserted into the database.

This works just like you want it to. (Presumably you d do something more useful with the word than print it out, though.) However, as you can see, this code is a bit ugly. To enter the loop in the first place, you have to assign a dummy (unused) value to word. Dummy values like this are usually a sign that you aren t doing things quite right. Let s try to get rid of it: word = raw_input('Please enter a word: ') while word: # do something with the word: print 'The word was ' + word word = raw_input('Please enter a word: ') Here the dummy is gone, but I have repeated code (which is also a bad thing): I have to use the same assignment and call to raw_input in two places. How can I avoid that I can use the while True/break idiom: while True: word = raw_input('Please enter a word: ') if not word: break # do something with the word: print 'The word was ' + word

Summary

Adding validations will make the test fail and show you where the parameters should be specified. So let s begin by adding a validation for the name field in the Publisher model. Open app/models/publisher.rb and modify it to look as follows: class Publisher < ActiveRecord::Base validates_length_of :name, :in => 2..255 validates_uniqueness_of :name end As you might remember, we specified the maximum length of the name field in the publishers table to be 255 characters. We add a validation to the model to verify this constraint and specify that the minimum length of the name field to be 2 characters. We also add a validation that checks that the publisher name is unique.