By Dave Thomas, David Heinemeier Hansson, Sam Ruby
Ruby on Rails is helping you produce high quality, beautiful-looking net functions speedy. you think about developing the applying, and Rails looks after the details.
Tens of millions of builders have used this award-winning ebook to profit Rails. It's a extensive, far-reaching instructional and reference that's instructed by way of the Rails center crew. If you're new to Rails, you'll get step by step information. If you're an skilled developer, this ebook offers you the excellent, insider info you need.
Rails has advanced through the years, and this booklet 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 beneficial properties. This version now supplies new Ruby and Rails clients additional info at the Ruby language and takes extra time to give an explanation for key strategies all through. most sensible practices on the way to practice Rails proceed to alter, and this version retains up. Examples use cookie subsidized periods, HTTP authentication, and energetic Record-based kinds, and the e-book focuses all through at the correct approach to use Rails. also, this variation now displays Ruby 1.9, a brand new liberate of Ruby with sizeable sensible and function improvements.
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Additional resources for Agile Web Development with Rails (4th edition)
Adding the Time Our original problem was to display the time to users of our application. We now know how to make our application display dynamic data. The second issue we have to address is working out where to get the time from. 1. 9, the standard format has changed, and times now look more like the following: 2010-02-23 14:33:14 -0500. 0 printing, October 28, 2010) 43 H ELLO , R AILS ! 44 Making Development Easier You might have noticed something about the development we’ve been doing so far.
You don’t need a semicolon at the end of a statement as long as you put each statement on a separate line. Ruby comments start with a # character and run to the end of the line. Indentation is not significant (but two-character indentation is the de facto Ruby standard). Ruby doesn’t use braces to delimit the bodies of compound statements and definitions (such as methods and classes). 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.
In that directory, use the rails command to create an application called demo. Be slightly careful here—if you have an existing directory called demo, you will be asked whether you want to overwrite any existing files. gitkeep The command has created a directory named demo. Pop down into that directory, and list its contents (using ls on a Unix box or dir under Windows). ru config/ db/ doc/ Gemfile lib/ log/ public/ Rakefile README script/ test/ tmp/ vendor/ All these directories (and the files they contain) can be intimidating to start with, but we can ignore most of them for now.
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