By Sam Ruby, Dave Thomas, David Heinemeier Hansson
Ruby on Rails is helping you produce top of the range, beautiful-looking net purposes speedy. you consider developing the appliance, and Rails looks after the main points. Tens of hundreds of thousands of builders have used this award-winning ebook to profit Rails. it is a extensive, far-reaching educational and reference that is prompt via the Rails middle group. in case you are new to Rails, you will get step by step assistance. if you are an skilled developer, this publication offers you the excellent, insider info you would like. Rails has advanced through the years, and this ebook has developed besides it. We nonetheless commence with a step by step walkthrough of creating a true software, and in-depth chapters examine the integrated Rails positive factors. This version now offers new Ruby and Rails clients additional information at the Ruby language and takes extra time to give an explanation for key recommendations all through. top practices on easy methods to observe Rails proceed to alter, and this variation retains up. Examples use cookie sponsored periods, HTTP authentication, and lively Record-based kinds, and the ebook focuses all through at the correct strategy to use Rails. also, this variation now displays Ruby 1.9, a brand new liberate of Ruby with monstrous sensible and function advancements.
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Additional info for Agile Web Development with Rails (4th edition) Beta 12 version
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. Within that object, attributes are used to get and set the individual columns. Our Order object has methods to get and set the amount, the sales tax, and so on. In addition, the Rails classes that wrap our database tables provide a set of class-level methods that perform table-level operations.
The MVC architecture was originally intended for conventional GUI applications, where developers found the separation of concerns led to far less coupling, which in turn made the code easier to write and maintain. Each concept or action was expressed in just one well-known place. Using MVC was like constructing a skyscraper with the girders already in place—it was a lot easier to hang the rest of the pieces with a structure already there. During the development of our application we will be making heavy use of Rails’ ability to generate scaffolding for our application.
If you look at the window where you started the server, you’ll see tracing showing you started the application. 0 printing, January 10, 2011) 39 H ELLO , R AILS ! 1: Newly created Rails application console window. Later, as we write application code and run it via our browser, we’ll be able to use this console window to trace the incoming requests. When the time comes to shut down your application, you can press Ctrl-C in this window to stop WEBrick. ) At this point, we have a new application running, but it has none of our code in it.
Agile Web Development with Rails (4th edition) Beta 12 version by Sam Ruby, Dave Thomas, David Heinemeier Hansson