By Dave Thomas, David Heinemeier Hansson, Leon Breedt, Mike Clark, Thomas Fuchs, Andrea Schwarz
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Extra info for Agile web development with rails: a Pragmatic guide
Def hello # code for hello action... 3: Rails Routes to Controllers and Actions Now let’s try calling it. Find a browser window, and navigate to the URL http://localhost:3000/say/hello. ) You’ll see something that looks like the following. It might be annoying, but the error is perfectly reasonable (apart from the weird path). We created the controller class and the action method, but we haven’t told Rails what to display. And that’s where the views come in. Remember when we ran the script to create the new controller?
Rb. Let’s have a look at it. File 209 defining classes → page 471 class SayController < ApplicationController end Pretty minimal, eh? SayController is an empty class that inherits from ApplicationController, so it automatically gets all the default controller behavior. Let’s spice it up. We need to add some code to have our controller handle the incoming request. What does this code have to do? For now, it’ll do nothing—we simply need an empty action method. So the next question is, what should this method be called?
You’ll just have to make minor adjustments to the DDL we use to create tables, and you’ll need to use that database’s syntax for some of the SQL we use in queries. (For example, later in the book we’ll use the MySQL now( ) function to compare a database column against the current date and time. ) The following table lists the available database adapters and gives links to their respective home pages. org/projects/sqlite-ruby There is a pure-Ruby version of the Postgres adapter available. org/projects/ruby-dbi.