By Dave Thomas

Rails is a full-stack, open resource net framework that permits you to create full-featured, refined web-based purposes, yet with a twist... a whole Rails program most likely has much less overall code than the XML you would have to configure an analogous software in different frameworks. With this booklet you are going to the best way to use ActiveRecord to attach enterprise items and database tables. not more painful object-relational mapping. simply create your corporation gadgets and enable Rails do the remaining. you will the way to use the motion Pack framework to path incoming requests and render pages utilizing easy-to-write templates and parts. See find out how to make the most the Rails carrier frameworks to ship emails, enforce net providers, and create dynamic, user-centric web-pages utilizing integrated Javascript and Ajax aid. There are large chapters on checking out, deployment, and scaling. you will see how effortless it really is to put in Rails utilizing your net server of selection (such as Apache or lighttpd) or utilizing its personal integrated net server. you may be writing functions that paintings together with your favourite database (MySQL, Oracle, Postgres, and extra) very quickly in any respect. you are going to create an entire on-line shop program within the prolonged educational part, so you will see how a whole Rails program is built - iteratively and quickly. Rails strives to honor the Pragmatic Programmer's "DRY precept" via fending off the additional paintings of configuration records and code annotations. you could improve in real-time: make a metamorphosis, and watch it paintings instantly. fail to remember XML. every little thing in Rails, from templates to regulate move to company common sense, is written in Ruby, the language of selection for programmers who prefer to get the task performed good (and go away paintings on time for a change). Rails is the framework of selection for the hot iteration of internet 2.0 builders. Agile internet improvement with Rails is the booklet for that new release, written by means of Dave Thomas (Pragmatic Programmer and writer of Programming Ruby) and David Heinemeier Hansson, who created Rails.

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When you point your browser at that URL, you are talking to the application code, which generates a response to you. 3. 4, Naming Conventions, on page 241. For now, let’s just assume the controller is called Say. defining classes ֒→ page 635 46 H ELLO , R AILS ! com/say/hello 1. First part of URL addresses the application 2. then the controller (say) 3. 2: URLs Are Mapped to Controllers and Actions However, the real situation is somewhat more complicated than that. com/. The web server that is hosting your application is fairly smart about paths.

Our First Action Let’s add an action called hello to our say controller. From the discussion in the previous section, we know that adding a hello action means creating a method called hello in the class SayController. But what should it do? For now, it doesn’t have to do anything. Remember that a controller’s job is to set up things so that the view knows what to display. In our first application, there’s nothing to set up, so an empty action will work fine. rb in the app/controllers directory, adding the hello method as shown.

3. The next part of the URL path, hello, identifies an action. Rails invokes a method of that name in the controller. This action method creates a new Time object holding the current time and tucks it away in the @time instance variable. 4. Rails looks for a template to display the result. rhtml). 5. Rails processes this template through ERb, executing any embedded Ruby and substituting in values set up by the controller. 6. The result is returned to the browser, and Rails finishes processing this request.

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