By Sam Ruby, Dave Thomas, David Heinemeier Hansson
Ruby on Rails is helping you produce high quality, beautiful-looking net 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 ebook to benefit Rails. it is a wide, far-reaching instructional and reference that is prompt by means of the Rails middle group. if you are new to Rails, you will get step by step advice. if you are an skilled developer, this e-book provide you with the great, insider details you wish. Rails has advanced through the years, and this e-book has developed in addition to it. We nonetheless commence 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 information at the Ruby language and takes extra time to provide an explanation for key innovations all through. most sensible practices on the right way to follow Rails proceed to alter, and this variation retains up. Examples use cookie sponsored classes, HTTP authentication, and lively Record-based varieties, and the ebook focuses all through at the correct method to use Rails. also, this variation now displays Ruby 1.9, a brand new unlock of Ruby with enormous practical and function advancements.
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Extra info for Agile Web Development with Rails (4th edition) Beta 10 version
As it stands, our story illustrates convention over configuration, one of the fundamental parts of the philosophy of Rails. By providing convenient defaults and by applying certain conventions on how a URL is constructed or in what file a controller definition is placed and what class name and method names are used, Rails applications are typically written using little or no external configuration—things just knit themselves together in a natural way. 3 Linking Pages Together It’s a rare web application that has just one page.
0 printing, October 28, 2010) 42 H ELLO , R AILS ! Dynamic Content There are many ways of creating dynamic templates in Rails. The most common way, we’ll use here, is to embed Ruby code in the template itself. erb suffix tells Rails to expand the content in the file using a system called ERb. erb file and outputs a transformed version. The output file is often HTML in Rails, but it can be anything. Normal content is passed through without being changed. However, content between <%= and %> is interpreted as Ruby code and executed.
Erb template works. Each time we access this page, the user will see the current time substituted into the body of the response. And for our trivial application, that might be good enough. In general, though, we probably want to do something slightly different. We’ll move the determination of the time to be displayed into the controller and leave the view with the simple job of displaying it. 0 printing, October 28, 2010) H ELLO , R AILS ! 45
It is now <%= @time %>
When we refresh our browser window, we will again see the current time, showing that the communication between the controller and the view was successful.