Java Reference
In-Depth Information
Scaffolding
Scaffolding lets you autogenerate a whole application for a given domain class including views and
controller actions for CRUD operations. Scaffolding can be either static or dynamic; both types
generate the same code. The main difference is that in static scaffolding, the generated code is
available to the user before compilation and thus can be easily modified if necessary. In dynamic
scaffolding, however, the code is generated in memory at runtime and is not visible to the user. In the
section that follows, you will learn about both dynamic and static scaffolding.
Dynamic Scaffolding
As explained earlier, the dynamic scaffolding generates controller actions and views for CRUD
applications at runtime. To dynamically scaffold a domain class, you need a controller. You created a
controller (
BookController
) in Listing 7-3. To use the dynamic scaffolding, change the
index
action to
a
scaffold
property and assign it the domain class, as shown in Listing 7-10. This causes List Page,
Create Page, Edit Page, and Show Page views, as well as delete functionality, to be generated for
the specified domain class.
Listing 7-10. Dynamic Scaffolding-Enabled BookController
package bookstore
class BookController {
static scaffold = Book
}
After changing
BookController
to look like Listing 7-10, execute the
run-app
target.
The output of executing the
run-app
target is shown here:
| Loading Grails 2.2.4
| Configuring classpath.
| Environment set to development.....
| Packaging Grails application.....
| Running Grails application
| Server running. Browse to
http://localhost:8080/bookstore
Click the BookController link on the welcome page.
Clicking the BookController link brings you to the Book List view shown in Figure
7-21
.
