在控制器函数中为请求后SpringBootHibernate获取的空列表

Question

我正在创建一个电子商务购物平台。

我有以下3个实体类：

>

产品库存

订单

订购的产品

@实体@Getter@Setter@noargsconstuctor@allargsconstuctor公共类ProductInventory{

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 private Long productId;

 private String name;

 private Double price;

 private Long availableQty;

 private String description;
 @Enumerated(EnumType.STRING)
 private Category category;

}

@Entity@Getter@Setter@NoArgsConstructor@AllArgsConstructor公共类订单{

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 private Long orderId;

 private String userEmail;

 @Temporal(TemporalType.DATE)
 @JsonFormat(shape = JsonFormat.Shape.STRING, pattern="dd/MM/yyyy")
 private Date orderDate;

 @Temporal(TemporalType.DATE)
 @JsonFormat(shape = JsonFormat.Shape.STRING, pattern="dd/MM/yyyy")
 private Date deliveryDate;

 private double bill;

 @JsonIgnore
 @OneToMany(cascade = CascadeType.ALL , mappedBy = "orders")
 private List<OrderedProduct> orderedProductList = new ArrayList<>();

}

@实体@Setter@Getter@noargsconstuctor@allargsconstuctor@jsonidentialinfo（property=“id”，generator=ObjectIdGenerators.PropertyGenerator.class）公共类OrderedProduct{

 @Id
 @GeneratedValue(strategy = GenerationType.AUTO)
 private Long id;

 private Long orderedProductId;

 private Long quantityOrdered;

 @ManyToOne(optional = false , fetch = FetchType.LAZY)
 @JoinColumn(name = "ORDEREDPRODUCT_ID")
 private Orders orders;

 @ManyToOne(optional = false , fetch = FetchType.LAZY)
 @JoinColumn(name = "product_product_id")
 private ProductInventory product;

}

我有以下控制器来接受POST请求。

@RestController
@RequestMapping("/orders")
public class OrderController {

    @Autowired
    private OrderService orderService;


    @PostMapping(value = "/placeOrder")
    public ResponseEntity<String> createUserRequest(@RequestBody Orders newOrder) throws IOException {
        System.out.println("NewOrder ID = "+ newOrder.getOrderId());
        System.out.println("NewOrder UserEmail = "+ newOrder.getUserEmail());
        System.out.println("NewOrder ORDERDATE = "+ newOrder.getOrderDate());
        System.out.println("NewOrder DELIVERYDATE = "+ newOrder.getDeliveryDate());
        System.out.println("NewOrder BILL = "+ newOrder.getBill());
        System.out.println("NewOrder List = "+ newOrder.getOrderedProductList());

        return orderService.createOrder(newOrder);
    }
}

当我发送以下POST请求时：

{
    "userEmail": "new order",
    "orderDate": "09/03/2022",
    "deliveryDate": "09/04/2022",
    "bill": 80,
    "orderedProductList": [
        {
            "orderedProductId": 1,
            "quantityOrdered": 3
        }
    ]
}

我在控制台中得到以下输出：

NewOrder ID = null
NewOrder UserEmail = new order
NewOrder ORDERDATE = Wed Mar 09 05:30:00 IST 2022
NewOrder DELIVERYDATE = Sat Apr 09 05:30:00 IST 2022
NewOrder BILL = 80.0
NewOrder List = [] --------------------I'm more concerned about this list being empty inside the controller
Inside OrderService 
Bill : 80.0
The number of ordered products are as follows : 0

当给定id的产品出现在表中或不在表中时，我尝试进行POST请求。它在控制台中返回相同结果的时间。

我还试图通过从JSON中删除“quantityOrdered”：3来完成这篇文章，但我还是得到了同样的结果。数据保存在MySqlDB中，但每次列表都是空的。

我无法找出我在哪里犯的错误。

有人能帮忙吗？

提前感谢。

Answer 1

该字段上有@JsonIgnore，因此它不会被反序列化。

请参阅此。