Download Agile Web Development with Rails (4th edition) by Dave Thomas, David Heinemeier Hansson, Sam Ruby PDF

By Dave Thomas, David Heinemeier Hansson, Sam Ruby

Ruby on Rails is helping you produce top quality, beautiful-looking internet purposes quick. you think about developing the applying, and Rails looks after the details.

Tens of millions of builders have used this award-winning e-book to profit Rails. It's a huge, far-reaching educational and reference that's urged by way of the Rails middle crew. If you're new to Rails, you'll get step by step information. If you're an skilled developer, this publication provides you with the excellent, insider details you need.

Rails has advanced through the years, and this publication has developed in addition to it. We nonetheless commence with a step by step walkthrough of establishing a true program, and in-depth chapters examine the integrated Rails positive aspects. This version now offers new Ruby and Rails clients additional info at the Ruby language and takes extra time to give an explanation for key ideas all through. top practices on find out how to observe Rails proceed to alter, and this variation retains up. Examples use cookie subsidized classes, HTTP authentication, and lively Record-based varieties, and the booklet focuses all through at the correct option to use Rails. also, this version now displays Ruby 1.9, a brand new unencumber of Ruby with enormous sensible and function improvements.

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Additional info for Agile Web Development with Rails (4th edition)

Example text

We will cover this command in greater depth on page 419. 5 Setting Up Your Development Environment The day-to-day business of writing Rails programs is pretty straightforward. Everyone works differently; here’s how we work. 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.

Rails uses symbols to identify things. In particular, it uses them as keys when naming method parameters and looking things up in hashes. For example: redirect_to :action => "edit", :id => params[:id] As you can see, a symbol looks like a variable name, but it’s prefixed with a colon. Examples of symbols include :action, :line_items, and :id. You can think of symbols as string literals that are magically made into constants. ” Now that we have used a few methods, let’s move on to how they are defined.

So, a simple approach would be to adopt this URL convention for our links. erb would contain the following: ...

Say Goodbye!

... erb would point the other way: ...

Say Hello!

... This approach would certainly work, but it’s a bit fragile. If we were to move our application to a different place on the web server, the URLs would no longer be valid. It also encodes assumptions about the Rails URL format into our code; it’s possible a future version of Rails might change this.

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