By Sam Ruby, Dave Thomas, David Heinemeier Hansson
Ruby on Rails is helping you produce top quality, beautiful-looking internet functions speedy. you consider developing the appliance, and Rails looks after the main points. Tens of millions of builders have used this award-winning ebook to benefit Rails. it is a large, far-reaching educational and reference that is prompt by means of the Rails center crew. if you are new to Rails, you will get step by step advice. in case you are an skilled developer, this e-book provides you with the great, insider details you would like. Rails has advanced through the years, and this publication has advanced in addition to 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 variation now supplies new Ruby and Rails clients additional info at the Ruby language and takes extra time to provide an explanation for key recommendations all through. top practices on the right way to follow Rails proceed to alter, and this version retains up. Examples use cookie subsidized classes, HTTP authentication, and energetic Record-based kinds, and the booklet focuses all through at the correct solution to use Rails. also, this version now displays Ruby 1.9, a brand new free up of Ruby with huge useful and function advancements.
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Additional resources for Agile Web Development with Rails (4th edition) Beta 10 version
Given an array object, you can access individual elements by supplying an index between square brackets, as the next example shows. Ruby array indices start at zero. 14 ] a a = nil # # # # array with three elements access the first element (1) set the third element array now [ 1, 'cat', nil ] You may have noticed that we used the special value nil in this example. ” In Ruby, that’s not the case; nil is an object, just like any other, that happens to represent nothing. 0 printing, October 28, 2010) 60 D ATA T YPES The method << is commonly used with arrays.
2: Rails and MVC metadata to make it all work. This is an example of the Rails philosophy of favoring convention over configuration. In a Rails application, an incoming request is first sent to a router, which works out where in the application the request should be sent and how the request itself should be parsed. Ultimately, this phase identifies a particular method (called an action in Rails parlance) somewhere in the controller code. The action might look at data in the request, it might interact with the model, and it might cause other actions to be invoked.
See how the model is being used to keep track of all the business data? ) Now that the cart includes the new product, we can show it to the user. The controller invokes the view code, but before it does, it arranges things so that the view has access to the cart object from the model. In Rails, this invocation is often implicit; again, conventions help link a particular view with a given action. That’s all there is to an MVC web application. By following a set of conventions and partitioning your functionality appropriately, you’ll discover that your code becomes easier to work with and your application becomes easier to extend and maintain.
Agile Web Development with Rails (4th edition) Beta 10 version by Sam Ruby, Dave Thomas, David Heinemeier Hansson