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
A single application can have multiple controllers. For our Depot application, it’s likely that we’ll end up with two of them, one handling the seller’s administration of the site and the other handling the buyer’s experience. We created the product maintenance scaffolding in the Admin controller, which is why the URL that accesses it has admin at the start of its path. The utility that generates a Rails scaffold populates your application’s directory tree with working Ruby code. If you examine it, you’ll find that what you have is the bare bones of a full application—the Ruby code has been placed inline; it’s all in the source, rather than simply being a single call into some standard library.
Normally, each style of page in your application will correspond to a separate view. In our case, we’ll also use a new action method to handle the page (although that isn’t always the case, as we’ll see later in the book). We’ll use the same controller for both actions. Again, this needn’t be the case, but we have no compelling reason to use a new controller right now. We already know how to add a new view and action to a Rails application. To add the action, we define a new method in the controller.
At this stage in the development, we don’t know if we’ll even be using a database—sometimes a flat file beats a database table hands down. 3 . Again, pencil and paper seems a whole lot easier than some fancy tool, but use whatever works for you. 3: Initial Guess at Application Data Working on the data diagram raised a couple of questions. As the user builds their shopping cart, we’ll need somewhere to keep the list of products she’s added to it, so I added a cart. But apart from its use as a transient place to keep this list, the cart seems to be something of a ghost—I couldn’t find anything meaningful to store in it.
Agile web development with rails: a Pragmatic guide by Dave Thomas, David Heinemeier Hansson, Leon Breedt, Mike Clark, Thomas Fuchs, Andrea Schwarz