org.hibernate.TransientObjectException使用CascadeType.ALL持久保留嵌套子级 [英] org.hibernate.TransientObjectException persisting nested children with CascadeType.ALL

问题描述

我有一个名为 Human 的类，其中包含狗的列表:

I have a class called Human which has a list of dogs :

@Entity
public class Human {

    @Id
    @GeneratedValue
    private Long id;

    @OneToMany(fetch = FetchType.LAZY, cascade = {CascadeType.ALL}, orphanRemoval = true)
    private Set<Dog> dogs = new HashSet<>(List.of(new Dog()));

    ...
}

狗类 Dog 有一个小狗列表:

@Entity
public class Dog {

    @Id
    @GeneratedValue
    private Long id;

    @OneToMany(fetch = FetchType.EAGER, cascade = {CascadeType.ALL}, orphanRemoval = true)
    private Set<Puppy> puppies = new HashSet<>(List.of(new Puppy()));
}

@Entity
public class Puppy {

    @Id
    @GeneratedValue
    private Long id;
}

当我尝试创建一个有狗的新人类并且该狗有一只小狗时，我使用带有Spring的Hibernate JPA存储库来保存该人类:

When I try to create a new human that has a dog and the dog has a puppy and I save the human using an Hibernate JPA repository with Spring :

Human human = new Human();
Set<Dog> dogs = new HashSet<>();
Dog dog = new Dog();
dog.setPuppies(new HashSet<>(List.of(new Puppy())));
dogs.add(dog);
human.setDogs(dogs);
humanRepository.save(human);

我收到以下错误:

org.hibernate.TransientObjectException:对象引用了一个未保存的瞬态实例-在刷新之前保存该瞬态实例:com.test.Puppy

但是，如果我创建具有默认值的人类并将其保存在人类资源库中，它将起作用并保存小狗.

But if I create the human, with the default values and save him with the human repository, it works and it saves the puppy.

Human human = new Human();
humanRepository.save(human);

我不明白为什么不自动保存小狗，并且我不想使用单独的存储库来保存小狗.当狗定义 CascadeType.ALL 时，Hibernate是否应该自动保存我的小狗?就像他们在此stackoverflow上说的那样:针对孩子的孩子的JPA Hibernate级联类型

I don't understand why the puppy is not automatically saved and I don't want to use a separate repository to save the puppy. Shouldn't Hibernate automatically save my puppy as the Dog defines CascadeType.ALL? Just like they say on this stackoverflow : JPA Hibernate cascade type for child of child

推荐答案

尝试更改级联类型以保留在关联注释中

try to change cascade type to persist in your association annotation

@OneToMany(获取= FetchType.EAGER，级联= {CascadeType.PERSIST}，orphanRemoval = true)

@OneToMany(fetch = FetchType.EAGER, cascade = {CascadeType.PERSIST}, orphanRemoval = true)

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