Download Agile Web Development with Rails (Pragmatic Programmers) by Sam Ruby PDF

By Sam Ruby

Ruby on Rails is helping you produce top quality, beautiful-looking internet purposes fast. you consider growing the applying, and Rails looks after the main points. Tens of millions of builders have used this award-winning ebook to profit Rails. it is a wide, far-reaching educational and reference that is steered through the Rails center workforce. in case you are new to Rails, you will get step by step advice. in case you are an skilled developer, this publication offers you the great, insider details you would like. Rails has developed through the years, and this booklet has developed besides it. We nonetheless commence with a step by step walkthrough of establishing a true software, and in-depth chapters examine the integrated Rails beneficial properties. 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 recommendations all through. most sensible practices on how you can follow Rails proceed to alter, and this version retains up. Examples use cookie subsidized periods, HTTP authentication, and energetic Record-based types, and the publication focuses all through at the correct option to use Rails. also, this variation now displays Ruby 1.9, a brand new liberate of Ruby with enormous sensible and function advancements.

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The Command Line We do a lot of work at the command line. Although there are an increasing number of GUI tools that help generate and manage a Rails application, we find the command line is still the most powerful place to be. It’s worth spending a little while getting familiar with the command line on your operating system. Find out how to use it to edit commands that you’re typing, how to search for and edit previous commands, and how to complete the names of files and commands as you type. So-called tab completion is standard on Unix shells such as Bash and zsh.

Any particular array or hash can hold objects of differing types; you can have an array containing an integer, a string, and a floating-point number, for example. You can create and initialize a new array object using an array literal—a set of elements between square brackets. Given an array object, you can access individual elements by supplying an index between square brackets, as the next example shows. Ruby array indices start at zero. 14 ] a[0] a[2] = nil # # # # array with three elements access the first element (1) set the third element array now [ 1, 'cat', nil ] report erratum • discuss Data Types • 41 You may have noticed that we used the special value nil in this example.

We normally run this window with a very small font so it takes up less space—if we see something interesting flash by, we zoom it up to investigate. We also need access to the Rails API documentation, which we view in a browser. In the introduction, we talked about using the gem server command to run a local web server containing the Rails documentation. This is convenient, but it unfortunately splits the Rails documentation across a number of separate documentation trees. If you’re online, you can use http://api.

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