By Ryan Bigg

Rails is a full-stack, open resource net framework powered via Ruby. Now in model four, Rails is mature and strong, and to take advantage of it successfully you would like quite a lot of Google searches. you can find no replacement for the guru's-eye-view of layout, checking out, deployment, and different real-world matters that this ebook offers. Rails four in motion is a hands-on consultant to the topic. during this totally revised new version, you will grasp Rails four through constructing a ticket-tracking program that incorporates RESTful routing, authentication and authorization, dossier uploads, e-mail, and extra. discover ways to layout your personal APIs and effectively installation a production-quality program. you will see test-driven improvement and behavior-driven improvement in motion through the publication, similar to in a best Rails store.

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Automated testing provides a quick safety net to inform developers when they make mistakes. And by they, of course, we mean you. We want you to make as few mistakes as possible. We want you to save your bacon! 1 Using TDD and BDD to save your bacon In addition to catching errors, TDD and BDD give you time to think through your decisions before you write any code. By first writing a test for the implementation, you are (or, at least, you should be) thinking through the implementation: the code you’ll write after the test and how you’ll make the test pass.

The second of the three ways is when you update a record, which we’ll look at now. 9 Updating Let’s change the cost of the foo purchase now. Perhaps it only cost 10. To change it, go back to http://localhost:3000/purchases and click the “Edit” link next to the foo record. 8. erb partial that was also used in the template for the new action. Such is the power of partials in Rails: you can use the same code for two different requests to your application. info Developing your first application 19 The template for this action is shown in the following listing.

The beginning tag for your form should look like this. erb

The two attributes to note here are action and method. The action attribute dictates the URL to where this form goes, and method tells the form what kind of HTTP request to make. How was this tag rendered in the first place? erb, which contains this as the first line: <%= form_for(@purchase) do |f| %> This one simple line generates that form tag.

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