grails - grails 2.5.1 removeFrom一对多给出奇怪的行为(不删除)

Question

我可以肯定我做错了，因为这显然行得通。简化的类:

class Person {
  String name
  static hasMany = [cats:Cat]
}

class Cat {
  String name
  Person person
  static belongsTo = Person
  static constraints = {
    person(nullable:false)
  }
  String toString() {
    "${person.name}-${name}"
  }
}

简单的东西，一个人有很多猫，猫必须只属​​于一个人。

现在，当我在Service类中执行以下操作时，会得到奇怪的结果:

delete(Cat cat) {
  Person owner = cat.person
  log.debug("Cats before removing ${cat} (id=${cat.id}): ${owner.cats} -- ${owner.cats*.id}")
  owner.removeFromCats(cat);
  log.debug("Removed from owner ${owner}, owner now has ${owner.cats} -- ${owner.cats*.id}")
  log.debug("Cat to delete is now: ${cat} and belongs to...  ${cat.person}")
  cat.delete(flush:true)
}

错误是“对象将被保存，等等”

org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations)

当调用该方法删除“鲍勃”(Bob)拥有的猫“蓬松”时，奇怪的是调试结果:

Cats before removing Bob-Fluffy (id=1356): [Bob-Fluffy] -- [1356]
Removed from owner Bob, owner now has [null-Fluffy] -- [1356]
Cat to delete is now: null-Fluffy and belongs to...  null

“removeFrom”实际上是不是从集合中删除了对象，这是怎么回事？我清理并重新编译。为什么我不能删除此对象，这几乎是一个茫然。

Answer 1

我会尝试将外地人删除为“人”人，而只留下这样的belongsTo场

class Cat {
  String name
  static belongsTo = [person:Person]
  static constraints = {
    person(nullable:false)
  }
  String toString() {
    "${person.name}-${name}"
  }
}