GORM inheritance simple exemple

Cours.groovy

package demo

class Cours {

  String name

  static hasMany = [users:User]

  static constraints = {}
}

Enseignant.groovy

package demo

class Enseignant extends User {

  String matiere

  static constraints = {}
}

User.groovy

package demo

class User {

  String name
  String firstName

  static hasMany = [cours:Cours]
  static belongsTo = [Cours]

  static constraints = {
   cours(nullable: true)
  }
}

UserIntegrationTestTests.groovy

package demo

import org.junit.After
import org.junit.Before
import org.junit.Test

class UserIntegrationTestTests {

  @Before
  void setUp() {
    // Setup logic here
  }

  @After
  void tearDown() {
    // Tear down logic here
  }

  @Test
  void testUserAndCourse() {
    def prof1 = new Enseignant(name: "toto", firstName: "titi", matiere: "maths")
    if (!prof1.save()) {
      prof1.errors.allErrors.each { println it }
    }
    def cours = new Cours(name: "maths")
    cours.addToUsers(prof1)
    cours.save()
    if (!cours.save()) {
      cours.errors.allErrors.each { println it }
    }
    assert Cours.count() > 0
  }
}