Download e-book for iPad: Agile Web Development with Rails (4th edition) Beta 10 by Sam Ruby, Dave Thomas, David Heinemeier Hansson

By Sam Ruby, Dave Thomas, David Heinemeier Hansson

ISBN-10: 1934356549

ISBN-13: 9781934356548

Ruby on Rails is helping you produce top of the range, beautiful-looking internet functions speedy. you consider growing the applying, and Rails looks after the main points. Tens of hundreds of thousands of builders have used this award-winning booklet to benefit Rails. it is a huge, far-reaching educational and reference that is suggested through the Rails middle staff. in case you are new to Rails, you will get step by step counsel. if you are an skilled developer, this ebook offers you the great, insider details you would like. Rails has advanced through the years, and this publication has advanced besides it. We nonetheless begin with a step by step walkthrough of creating a true software, and in-depth chapters examine the integrated Rails beneficial properties. This version now offers new Ruby and Rails clients additional info at the Ruby language and takes extra time to give an explanation for key innovations all through. most sensible practices on the right way to practice Rails proceed to alter, and this variation retains up. Examples use cookie subsidized periods, HTTP authentication, and energetic Record-based kinds, and the publication focuses all through at the correct option to use Rails. also, this variation now displays Ruby 1.9, a brand new liberate of Ruby with massive practical and function advancements.

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Extra resources for Agile Web Development with Rails (4th edition) Beta 10 version

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Now lets move on to an overview of Rails itself. 0 printing, October 28, 2010) 49 In this chapter, we’ll see • models, • views, and • controllers. Chapter 3 The Architecture of Rails Applications One of the interesting features of Rails is that it imposes some fairly serious constraints on how you structure your web applications. Surprisingly, these constraints make it easier to create applications—a lot easier. Let’s see why. 1 Models, Views, and Controllers Back in 1979, Trygve Reenskaug came up with a new architecture for developing interactive applications.

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... This approach would certainly work, but it’s a bit fragile. If we were to move our application to a different place on the web server, the URLs would no longer be valid. It also encodes assumptions about the Rails URL format into our code; it’s possible a future version of Rails might change this. Fortunately, these aren’t risks we have to take. Rails comes with a bunch of helper methods that can be used in view templates.

When you write object-oriented code, you’re normally looking to model concepts from the real world. Typically during this modeling process you’ll discover categories of things that need to be represented. In an online store, the concept of a line item could be such a category. In Ruby, you’d define a class to represent each of these categories. You then use this class as a kind of factory that generates objects—instances of that class. An object is a combination of state (for example, the quantity and the product id) and methods that use that state (perhaps a method to calculate the line item’s total cost).

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Agile Web Development with Rails (4th edition) Beta 10 version by Sam Ruby, Dave Thomas, David Heinemeier Hansson

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