Create the domain classes

Grails uses the Model View Controller (MVC) pattern for web development. We will work on our model first. To allow the application to manage users, we will need a User class and a Role class. These must be created as domain classes in Grails. Domain classes constitute the domain model for the application. They are mapped directly to database tables by the Grails framework and form the central structure of an application. You can create new domain classes by using the supplied Grails command line tool.

Go to your console and enter:

>grails create-domain-class app.User

The output of this command should look like this:

Welcome to Grails 1.1 - http://grails.org/ Licensed under Apache Standard License 2.0 Grails home is set to: /tools/grails-1.1 Base Directory: /workspace/books/effective-grails/code-1.1/chapter02/teamwork Running script /tools/grails-1.1/scripts/CreateDomainClass.groovy Environment set to development [mkdir] Created dir: /workspace/books/effective-grails/code-1.1/chapter02/teamwork/grails-app/domain/app Created DomainClass for User [mkdir] Created dir: /workspace/books/effective-grails/code-1.1/chapter02/teamwork/test/unit/app Created Tests for User

Now, enter:

>grails create-domain-class app.Role

You should see from the messages in the console that both the User and Role classes have been created, along with a test class for each of them. The new classes will be created in the app package.

package app
class User {
static constraints = {
}
}

package app
class User {
String username String title String firstName String lastName String password Date dateCreated Date lastModified 
static constraints = {
}
}

package app
class Role {
String name 
static constraints = {
}
}