Entity\ClassUser:
  type: entity
  table: class_user
  repositoryClass: Entity\Repository\ClassUserRepository
  fields:
    class_id:
      id: true
      type: integer
      unsigned: false
      nullable: false
    user_id:
      id: true
      type: integer
      unsigned: false
      nullable: false
  lifecycleCallbacks:
    prePersist:
      - before_save