CODEWITHSUNDEEP
javaspringspring-boothibernatejpa
user13505963
user13505963

Reputation:

Spring Many to one in json

Hello is it possible to add mapped value in json?

Product entity

@Id
@Column(unique = true)
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
@Column(unique = true)
private String title;
private String description;
@OneToMany(fetch = FetchType.LAZY)
private List<Options> options= new ArrayList<>();

Option entity

    @Id
    @Column(unique = true)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @ManyToOne(fetch = FetchType.EAGER)
    @OnDelete(action = OnDeleteAction.CASCADE)
    @JsonIgnore
    private Product product;
    private BigDecimal price=new BigDecimal(0);
    private BigDecimal discount=new BigDecimal(0);

What i get is

        {
            "id": 2,
            "price": 300.00,
            "discount": 35.00
        },

What i want is

    {
        "id": 2,
        "price": 300.00,
        "discount": 35.00,
        "product":[
          "id": 2,
          "title": "dsfa",
          "description": "dsfa",
          ....
        ]
    },

I want to add product to json response, how can i achieve this?

Upvotes: 1

Views: 654

Answers (2)

Seldo97
Seldo97

Reputation: 729

Yes, just use @JsonIgnoreProperties.

@Id
@Column(unique = true)
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
@Column(unique = true)
private String title;
private String description;
@OneToMany(fetch = FetchType.LAZY)
@JsonIgnoreProperties(value = {"product"})
private List<Options> options= new ArrayList<>();

and second class:

@Id
@Column(unique = true)
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
@ManyToOne(fetch = FetchType.EAGER)
@OnDelete(action = OnDeleteAction.CASCADE)
@JsonIgnoreProperties(value = {"options"})
private Product product;
private BigDecimal price=new BigDecimal(0);
private BigDecimal discount=new BigDecimal(0);

You will avoid the infinity loop in json result and get all reference objects (relationships).

Upvotes: 1

ATA
ATA

Reputation: 31

One Product have many Option or viceversa? In your code one Product have many Option.

But if the relation is correct, the better way to get a custom result is with DTOs.

With DTO you can create a custom Class with all the details you need, example:

ProductDTO

private Integer id;
private String title;
private String description;

getter / setter

OptionDTO

private Integer id;
private BigDecimal price=new BigDecimal(0);
private BigDecimal discount=new BigDecimal(0);
private List<Product> products;

getter / setter

Soo, first retrieve with you service and reposity you data, then you set the DTO.

After you can send you data and get your custom Json.

Upvotes: 1

Related Questions