grails-data-hibernate5/examples/grails-database-per-tenant/grails-app/domain/example/Book.groovy

package example

import grails.gorm.MultiTenant
import org.grails.datastore.gorm.GormEntity

class Book implements GormEntity<Book>, MultiTenant<Book> {

    String title
    
    static constraints = {
        title blank:false
    }
}