By Dave Thomas, David Heinemeier Hansson, Leon Breedt, Mike Clark, Thomas Fuchs, Andrea Schwarz
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Additional resources for Agile web development with rails: a Pragmatic guide
3, on the next page). Perhaps it isn’t the prettiest interface, but it works, and we can show it to our client for approval. 4, on page 56). We explain to them that this is only a first step—we know it’s rough, but we wanted to get their feedback early. ) Rails Scaffolds We covered a lot of ground in a very short initial implementation, so let’s take a minute to look at that last step in a bit more detail. A Rails scaffold is an autogenerated framework for manipulating a model. When we run the generator, we tell it that we want a scaffold for a particular model (which it creates) and that we want to access it through a given controller (which it also creates).
Rhtml? ) For now, let’s just put some basic HTML in there. rhtml, and refresh your browser window. You should see it display our friendly greeting. Notice that we didn’t have to restart the application to see the update. During development, Rails automatically integrates changes into the running application as you save files. So far, we’ve added code to two files in our Rails application tree. We added an action to the controller, and we created a template to display a page in the browser. These files live in standard locations in the Rails hierarchy: controllers go into app/controllers, and views go into subdirectories of app/views.
Our application will use this when we put it online. We’ll use the mysql command-line client to create our databases, but if you’re more comfortable with tools such as phpmyadmin or CocoaMySQL, go for it. ) depot> mysql -u root -p Enter password: ******* Welcome to the MySQL monitor. mysql> mysql> mysql> mysql> mysql> mysql> mysql> Commands end with ; or \g. 3, on page 47, we sketched out the basic content of the products table. Now let’s turn that into reality. Here’s the Data Definition Language (DDL) for creating the products table in MySQL.