CrudRepository.save（）似乎级联

实体调查：

    @Entity
    @Table(name = "Survey")
    public class Survey implements Serializable {

        private Long id;
        private String name;
        private String address;
        private List<Question> questions;

        @Id
        @Column(name = "id")
        public Long getId() {
            return id;
        }

        @Column(name = "name")
        public String getName() {
            return name;
        }

        @Column(name = "address")
        public String getAddress() {
            return address;
        }

        @OneToMany(fetch = FetchType.LAZY, mappedBy = "survey")
        public List<Question> getQuestions() {
            return questions;
        }

        public void setId(Long id) {
            this.id = id;
        }

        public void setName(final String name) {
            this.name = name;
        }

        public void setAddress(final String address) {
            this.address = address;
        }

        public void setQuestions(List<Question> _questions) {
            this.questions = _questions;
        }
    }

问题实体：

@Entity
@Table(name = "Question")
public class Question {

    private Long id;
    private String question;
    private Survey survey;

    @Id
    @Column(name = "id")
    public Long getId() {
        return id;
    }

    @Column(name = "question")
    public String getQuestion() {
        return question;
    }

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "survey_id")
    public Survey getSurvey() {
        return survey;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public void setQuestion(String question) {
        this.question = question;
    }

    public void setSurvey(Survey survey) {
        this.survey = survey;
    }
}

问题Crud回购：

 public interface QuestionRepo extends CrudRepository<Question, Long> {
    }

控制器：

@RestController
@RequestMapping("/default")
public class DefaultEndpoint {

    @Autowired
    private QuestionRepo questionRepo;


    @PostMapping(value = "/saveQuestion")
    public void saveQuestion(@Param("id") Long id, @Param("question") String question, @Param("survey_id") Long survey_id) {
        Question questionObject = new Question();
        questionObject.setId(id);
        questionObject.setQuestion(question);
        Survey survey = surveyRepo.findById(survey_id).get();
        survey.setName("example");
        questionObject.setSurvey(survey);
        questionRepo.save(questionObject);
    }
}

在控制器代码段中，当我做 Survey.setName（“ example”）; 。此更改反映在数据库上。

这意味着，即使未指定级联类型，使用EntityManager方法MERGE和PERIST实现的save（）操作也会级联到子实体。 这是应该如何工作的，还是我在犯一些愚蠢的错误？ 非常感谢 ！

问题来源：Stack Overflow