By Dave Thomas
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Extra info for Agile Web Development with Rails: A Pragmatic Guide
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.