CODEWITHSUNDEEP
springspring-bootjackson
Pinwheeler
Pinwheeler

Reputation: 1111

How to test with @JSONManagedReference the way I want it?

I want to show the "parent" data in the "child" entity response in a @manyToOne relationship.

@Entity
public class Parent {
    @JsonBackReference(value = "parent-children")
    @OneToMany(mappedBy = "parent", targetEntity = Child.class)
    private List<Children> children;
}

@Entity
public class Child {
    @JsonManagedReference(value = "parent-children")
    @ManyToOne
    private Parent parent;
}

The response object for such a relationship is amazing, exactly what I want

GET web.site/children/all

[
  {
    "id": 1,
    "parent": {
      "id": 1,
      "other": "data",
    },
  }
]

But when I run tests, the test runner can't compile! Searching for this error on Google gets me to several articles that say that I have the relationship the wrong way around.

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot handle managed/back reference 'parent-children': back reference type (java.util.List) not compatible with managed type (website.entities.Child)

Switching the types around causes JSON results I don't want

GET web.site/children/all

[
  {
    "id": 1,
  }
]

Upvotes: 0

Views: 275

Answers (1)

Villat
Villat

Reputation: 1465

You could try using @JsonIgnoreProperties like this:

@Entity
public class Parent {
    @JsonIgnoreProperties("parent")
    @OneToMany(mappedBy = "account", targetEntity = Child.class)
    private List<Children> children;
}

@Entity
public class Child {
    @JsonIgnoreProperties("children")    
    @ManyToOne
    private Parent parent;
}

Some notes:

1) You are using mappedBy="account", why don't you use mappedBy="parent" ?

2) By convention, you should use private List<Children> childrens; in plural

Upvotes: 1

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