Spring MVC/Spring Data data fetch遞歸

Question

我有一個實體one-to-many relationship（例如Person o->m Book）。如果我想用控制器中的書取人，它會導致遞歸。 @JsonIgnore by FasterXML有幫助，但如果我想bidirectional無遞歸提取，該怎麼辦。例如提取Person with Books和提取Book with Persons？

Answer 1

使用@JsonBackReference

class Person{ 
    @OneToMany(mappedBy="person",fetch = FetchType.EAGER) 
    private List<Book> books; 
    ... 
} 

class Book { 
    @ManyToOne 
    @JoinColumn(columnDefinition="integer", name = "person", nullable=false) 
    @JsonBackReference 
    private Person person; 
    ... 
}