Agile Web Development with Rails 4 (Facets of Ruby) by Dave Thomas, David Heinemeier Hansson, Sam Ruby

By Dave Thomas, David Heinemeier Hansson, Sam Ruby

Rails simply retains on altering. either Rails three and four, in addition to Ruby 1.9 and 2.0, deliver hundreds of thousands of advancements, together with new APIs and tremendous functionality improvements. The fourth variation of this award-winning vintage has been reorganized and refocused so it's extra beneficial than ever earlier than for builders new to Ruby and Rails.

Rails four introduces a few user-facing alterations, and the publication has been up to date to check the entire most up-to-date alterations and new most sensible practices in Rails. This comprises complete help for Ruby 2.0, controller issues, Russian Doll caching, robust parameters, Turbolinks, new try and bin listing layouts, and lots more and plenty more.

Ruby on Rails is helping you produce fine quality, beautiful-looking net purposes fast. you think about growing the applying, and Rails looks after the details.

Tens of millions of builders have used this award-winning ebook to benefit Rails. It's a large, far-reaching educational and reference that's steered by way of the Rails center crew. If you're new to Rails, you'll get step by step tips. If you're an skilled developer, this e-book provide you with the great, insider details you need.

Rails has developed through the years, and this publication has advanced in addition to it. We nonetheless begin with a step by step walkthrough of creating a true program, and in-depth chapters examine the integrated Rails positive aspects. This version now offers new Ruby and Rails clients additional information at the Ruby language and takes extra time to give an explanation for key options all through. top practices on how one can observe Rails proceed to alter, and this variation retains up. Examples use issues, Russian Doll caching, and Turbolinks, and the ebook focuses all through at the correct solution to use Rails. also, this version now works on Ruby 2.0, a brand new unencumber of Ruby with mammoth practical and function improvements.

This variation is for Rails4.0 and beyond.

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Sample text

This command will also detect common installation errors. For example, if it can’t find a JavaScript runtime, it will provide you with a link to available runtimes. If you see a bunch of messages concerning already initialized constants or a possible conflict with an extension, consider deleting the demo directory, creating a separate RVM gemset,1 and starting over. If that doesn’t work, use 2 bundle exec to run rake commands. Once you get rake about working, you have everything you need to start a standalone web server that can run our newly created Rails application.

Now end def goodbye end end report erratum • discuss Hello, Rails! • 23 Making Development Easier You might have noticed something about the development we’ve been doing so far. As we’ve been adding code to our application, we haven’t had to restart the running application. It has been happily chugging away in the background. And yet each change we make is available whenever we access the application through a browser. What gives? It turns out that the Rails dispatcher is pretty clever. In development mode (as opposed to testing or production), it automatically reloads application source files when a new request comes along.

This is great for development. However, this flexibility comes at a cost—it causes a short pause after you enter a URL before the application responds. That’s caused by the dispatcher reloading stuff. For development it’s a price worth paying, but in production it would be unacceptable. Because of this, this feature is disabled for production deployment (see Chapter 16, Task K: Deployment and Production, on page 233). erb template, we’ll use this instance variable to substitute the time into the output.

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