By Sam Ruby, Dave Thomas, David Heinemeier Hansson
Ruby on Rails is helping you produce top of the range, beautiful-looking net purposes quick. you think about developing the appliance, and Rails looks after the main points. Tens of millions of builders have used this award-winning e-book to benefit Rails. it is a large, far-reaching instructional and reference that is instructed by way of the Rails middle workforce. if you are new to Rails, you will get step by step assistance. in case you are an skilled developer, this ebook provides you with the excellent, insider details you wish. Rails has developed through the years, and this booklet has advanced in addition to it. We nonetheless commence with a step by step walkthrough of establishing a true program, and in-depth chapters examine the integrated Rails gains. This variation now provides new Ruby and Rails clients additional info at the Ruby language and takes extra time to give an explanation for key thoughts all through. most sensible practices on the way to observe Rails proceed to alter, and this variation retains up. Examples use cookie subsidized periods, 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 unencumber of Ruby with monstrous sensible and function advancements.
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Additional resources for Agile Web Development with Rails (4th edition) Beta 12 version
0 printing, January 10, 2011) 54 R AILS M ODEL S UPPOR T Over time, folks have worked out ways of reconciling the relational and OO views of their corporate data. Let’s look at the way that Rails chooses to map relational data onto objects. Object-Relational Mapping ORM libraries map database tables to classes. If a database has a table called orders, our program will have a class named Order. Rows in this table correspond to objects of the class—a particular order is represented as an object of class Order.
The Story So Far Let’s briefly review how our current application works: 1. The user navigates to our application. In our case, we do that using a local URL such as http://localhost:3000/say/hello. 2. Rails then matches the route pattern, which it previously split into two parts and analyzed. rb). 3. The next part of the pattern, hello, identifies an action. Rails invokes a method of that name in the controller. This action method creates a new Time object holding the current time and tucks it away in the @time instance variable.