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

By Sam Ruby

Ruby on Rails is helping you produce top of the range, beautiful-looking net purposes quick. you think about developing the applying, and Rails looks after the main points. Tens of millions of builders have used this award-winning booklet to profit Rails. it is a huge, far-reaching instructional and reference that is urged through the Rails center crew. if you are new to Rails, you will get step by step tips. in case you are an skilled developer, this e-book provide you with the great, insider info you wish. Rails has advanced through the years, and this booklet 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 gains. This variation now supplies new Ruby and Rails clients additional information at the Ruby language and takes extra time to give an explanation for key options all through. most sensible practices on tips to observe Rails proceed to alter, and this variation retains up. Examples use cookie subsidized periods, HTTP authentication, and energetic Record-based types, and the booklet focuses all through at the correct technique to use Rails. also, this version now displays Ruby 1.9, a brand new free up of Ruby with giant sensible and function advancements.

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Our First Action At this point, we can see not only that have we connected the URL to our controller but also that Rails is pointing the way to our next step, namely, to tell Rails what to display. That’s where views come in. Remember when we ran the script to create the new controller? That command added six files and a new directory to our application. That directory contains the template files for the controller’s views. In our case, we created a controller named say, so the views will be in the directory app/views/say.

In development mode (as opposed to testing or production), it automatically reloads application source files when a new request comes along. That way, when we edit our application, the dispatcher makes sure it’s running the most recent changes. 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.

It may surprise you to know that most Rails developers don’t use fully fledged IDEs for Ruby or Rails (although some of the environments come close). Indeed, many Rails developers use plain old editors. And it turns out that this isn’t as much of a problem as you might think. With other, less expressive languages, programmers rely on IDEs to do much of the grunt work for them, because IDEs do code generation, assist with navigation, and compile incrementally to give early warning of errors. With Ruby, however, much of this support just isn’t necessary.

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