By Sam Ruby, Dave Thomas, David Heinemeier Hansson
Ruby on Rails is helping you produce top of the range, 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 e-book to benefit Rails. it is a extensive, far-reaching educational and reference that is steered by way of the Rails middle crew. if you are new to Rails, you will get step by step assistance. in case you are an skilled developer, this booklet provides you with the excellent, insider info you wish. Rails has advanced through the years, and this ebook has developed besides it. We nonetheless begin with a step by step walkthrough of establishing a true software, and in-depth chapters examine the integrated Rails positive aspects. This variation now offers new Ruby and Rails clients additional info at the Ruby language and takes extra time to provide an explanation for key ideas all through. most sensible practices on easy methods to practice Rails proceed to alter, and this version retains up. Examples use cookie sponsored periods, HTTP authentication, and lively Record-based varieties, and the publication focuses all through at the correct solution to use Rails. also, this version now displays Ruby 1.9, a brand new liberate of Ruby with large practical and function advancements.
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Extra info for Agile Web Development with Rails (Bata 10.0 2010.10.29)
Instead, you simply finish the body with the keyword end. The keyword return is optional, and if not present, the results of the last expression evaluated will be returned. 2 Data Types While everything in Ruby is an object, some of the data types in Ruby have special syntax support, in particular for defining literal values. In these examples, we’ve used some simple strings and even string concatenation. Strings This previous example also showed some Ruby string objects. One way to create a string object is to use string literals, which are sequences of characters between single or double quotation marks.
With a few exceptions, what you type into the single-quoted string literal becomes the string’s value. 0 printing, October 28, 2010) 59 D ATA T YPES In the double-quoted case, Ruby does more work. First, it looks for substitutions—sequences that start with a backslash character—and replaces them with some binary value. The most common of these is \n, which is replaced with a newline character. When you write a string containing a newline to the console, the \n forces a line break. Second, Ruby performs expression interpolation in double-quoted strings.
This action method creates a new Time object holding the current time and tucks it away in the @time instance variable. 4. Rails looks for a template to display the result. erb). 5. Rails processes this file through the ERb templating system, executing any embedded Ruby and substituting in values set up by the controller. 6. The result is returned to the browser, and Rails finishes processing this request. 0 printing, October 28, 2010) L INKING P AGES T OGETHER This isn’t the whole story—Rails gives you lots of opportunities to override this basic workflow (and we’ll be taking advantage of them shortly).
Agile Web Development with Rails (Bata 10.0 2010.10.29) by Sam Ruby, Dave Thomas, David Heinemeier Hansson