Agile Web Development with Rails: A Pragmatic Guide by Dave Thomas

By Dave Thomas

Rails is a full-stack, open resource internet framework that permits you to create full-featured, refined web-based functions, yet with a twist... an entire Rails program most likely has much less overall code than the XML you would have to configure an identical program in different frameworks. With this e-book you will how you can use ActiveRecord to attach enterprise gadgets and database tables. not more painful object-relational mapping. simply create your small business gadgets and permit Rails do the remainder. you will the right way to use the motion Pack framework to direction incoming requests and render pages utilizing easy-to-write templates and parts. See the best way to make the most the Rails provider frameworks to ship emails, enforce internet prone, and create dynamic, user-centric web-pages utilizing integrated Javascript and Ajax help. There are large chapters on trying out, deployment, and scaling. you will see how effortless it's to put in Rails utilizing your internet server of selection (such as Apache or lighttpd) or utilizing its personal incorporated net server. you will be writing purposes that paintings together with your favourite database (MySQL, Oracle, Postgres, and extra) very quickly in any respect. you will create an entire on-line shop program within the prolonged educational part, so you will see how a whole Rails program is built - iteratively and quickly. Rails strives to honor the Pragmatic Programmer's "DRY precept" by way of warding off the additional paintings of configuration records and code annotations. you could advance in real-time: make a metamorphosis, and watch it paintings instantly. overlook XML. every thing in Rails, from templates to regulate stream to enterprise good judgment, is written in Ruby, the language of selection for programmers who wish to get the activity performed good (and go away paintings on time for a change). Rails is the framework of selection for the hot new release of net 2.0 builders. Agile net improvement with Rails is the booklet for that iteration, written by way of Dave Thomas (Pragmatic Programmer and writer of Programming Ruby) and David Heinemeier Hansson, who created Rails.

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As we saw in Chapter 2, The Architecture of Rails Applications, on page 22, Rails is a Model-View-Controller framework. Rails accepts incoming requests from a browser, decodes the request to find a controller, and calls an action method in that controller. The controller then invokes a particular view to display the results to the user. The good news is that Rails takes care of most of the internal plumbing that links all these actions. To write our simple Hello, 45 H ELLO , R AILS ! World! application, we need code for a controller and a view.

Symbols probably cause more confusion than any other language feature when folks first come to Ruby. We’ve tried many different explanations—no single explanation works for everyone. For now, you can just think of a Ruby symbol as being like a constant string but one without all the string methods. It’s the name tag, not the person. rhtml, linking it back to the initial hello page.

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Say <%= link_to "Hello" , :action => "hello" %> again. 4 What We Just Did In this chapter we constructed a toy application.

We discuss rxml templates starting on page 468. Rails also provides rjs views. These allow you to create JavaScript fragments on the server that are then executed on the browser. This is great for creating dynamic Ajax interfaces. We talk about these starting on page 559. And the Controller! The Rails controller is the logical center of your application. It coordinates the interaction between the user, the views, and the model. However, Rails handles most of this interaction behind the scenes; the code you write concentrates on application-level functionality.

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