bindData() is changing the domain id when using gorm inheritance - grails-orm

Question

I have a grails domain class that extends a base class in the src folder, like so:
// src/main/groovy/demo/MyBaseClass.groovy
package demo
import grails.gorm.dirty.checking.DirtyCheck
#DirtyCheck
class MyBaseClass {
String name
}
// grails-app/domain/demo/MyDomain.groovy
package demo
class MyDomain extends MyBaseClass {
Date birthDate
}
However, when using bindData in the controller, the id of MyDomain can be changed by the request params. This can be checked with this failing test:
// src/test/groovy/demo/IdDataBindingSpec.groovy
package demo
import grails.web.databinding.DataBinder
import org.grails.testing.GrailsUnitTest
import spock.lang.Specification
class IdDataBindingSpec extends Specification
implements GrailsUnitTest, DataBinder {
void "Bind id to MyDomain is not possible"() {
given: "A new instance"
MyDomain myDomain = new MyDomain()
and: "Request params"
Map params = [id:5, name:'test']
when: "Binding data"
bindData(myDomain, params)
then: "id is not updated"
!myDomain.id
and: "Other params are updated"
myDomain.name == 'test'
}
}
Any normal domain will pass the above test, but the domain extending a base class from src will not. How can i fix this behavior?
Edit: I'm using Grails 3.3.8 with gorm 6.1

Answer 1

When using gorm inheritance, the base classes in src must be declared as abstract, like so:
// src/main/groovy/demo/MyBaseClass.groovy
package demo
import grails.gorm.dirty.checking.DirtyCheck
#DirtyCheck
abstract class MyBaseClass {
String name
}