Migrating Rails app to Grails - Can I easily use an int for the ID field of all the domain classes?

If so how do I do it? I t开发者_JAVA技巧ried just using a declaration id type: 'int' but it got an error when calling Find on the class.

I believe you simply have to declare the id field as a member.

class MyDomainClass {
    int id
}