当belongsTo指定多个类时，Grails的belongsTo级联删除？
class Owner {
static hasMany = Dog
}
class Sitter {
static hasMany = Dog
}
class Dog {
static belongsTo = [Owner, Sitter]
}
我的问题是：如果我创建一个 Dog 实例 D、一个 Owner 实例 O、一个 Sitter 实例 S，并将 D 与 O 和 S 关联起来，当 S 被删除时，O 会发生什么？ O还会有D吗？既然是级联删除，那么S和D都会被删除，对吧？ O什么时候会发生什么？还会有D吗？
class Owner {
static hasMany = Dog
}
class Sitter {
static hasMany = Dog
}
class Dog {
static belongsTo = [Owner, Sitter]
}
My question is: If I create a Dog instance D, a Owner instance O, a Sitter instance S and associate D with both O and S, what happens to O when S gets deleted? Would O still have D? Since it's a cascade-delete, both S and D would get deleted, right? When what happens to O? Would it still have D?
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我测试过，它遵循级联规则：如果删除Owner，Dog会被级联删除，但Sitter会保留。
这是合理的：保姆独立于所有者。仅仅因为 Sitter 与 Owner 有一些共同的属性，就应该将其与 Owner 一起删除，这是不合逻辑的。
I have tested it, it follows the cascade rule: if you delete Owner, Dog will be deleted by cascade, but Sitter will remain.
And it's reasonable: Sitter is independent with Owner. It's illogical that Sitter should be deleted along with Owner, just because he has some common properties with Owner.