By Sam Ruby, Dave Thomas, David Heinemeier Hansson
Ruby on Rails is helping you produce top quality, beautiful-looking internet functions speedy. you consider growing the appliance, and Rails looks after the main points. Tens of millions of builders have used this award-winning booklet to benefit Rails. it is a huge, far-reaching educational and reference that is instructed by means of the Rails center crew. in case you are new to Rails, you will get step by step tips. if you are an skilled developer, this booklet provides you with the excellent, insider info you wish. Rails has developed through the years, and this ebook has developed besides it. We nonetheless begin with a step by step walkthrough of creating a true software, and in-depth chapters examine the integrated Rails positive factors. This variation now provides new Ruby and Rails clients additional info at the Ruby language and takes extra time to provide an explanation for key techniques all through. top practices on tips on how to observe 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 method to use Rails. also, this variation now displays Ruby 1.9, a brand new unencumber of Ruby with giant useful and function advancements.
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Additional info for Agile Web Development with Rails (4th edition) Beta 13 (2011)
There may well be many views that access the same model data, often for different purposes. 1: The Model-View-Controller architecture be a view that displays product information on a catalog page and another set of views used by administrators to add and edit products. Controllers orchestrate the application. Controllers receive events from the outside world (normally user input), interact with the model, and display an appropriate view to the user. This triumvirate—the model, view, and controller—together form an architecture known as MVC.
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. For example, we might need to find the order with a particular id. This is implemented as a class method that returns the corresponding Order object. amount end Finally, the objects corresponding to individual rows in a table have methods that operate on that row. save end So, an ORM layer maps tables to classes, rows to objects, and columns to attributes of those objects.
Under Linux, you’ll need gcc and friends (but these will likely already be installed). Under OS X, you’ll need to install the developer tools (they come with the operating system but aren’t installed by default). You’ll also need to install your database driver into the correct version of Ruby. If you installed your own copy of Ruby, bypassing the built-in one, it is important to remember to have this version of Ruby first in your path when building and installing the database driver. You can use the command which ruby to make sure you’re not running Ruby from /usr/bin.