POST請求SpringBootHIbernate的Controller函式中獲取的EmptyList

我正在創建一個電子商務購物平臺。

我有以下 3 個物體類：

1. 產品庫存

2. 命令

3. 訂購產品

   @Entity @Getter @Setter @NoArgsConstructor @AllArgsConstructor 公共類 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 公共類訂單 {

    @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<>();
   

   }

   @Entity @Setter @Getter @NoArgsConstructor @AllArgsConstructor @JsonIdentityInfo(property = "id",generator = ObjectIdGenerators.PropertyGenerator.class) 公共類 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;
   

   }

我有以下控制器來接受 POST 請求。

@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);
    }
}

當我發送以下POST請求時：

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

我在控制臺中得到以下輸出：

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

當表中存在和不存在具有給定 id 的產品時，我嘗試執行 POST 請求。兩次它在控制臺中回傳相同的結果。

我還嘗試通過"quantityOrdered": 3從 JSON 中洗掉 POST 來執行 POST，但我又得到了相同的結果。資料保存在 MySqlDB 中，但串列每次都是空的。

我無法找出我在哪里犯了錯誤。

任何人都可以幫忙嗎？

提前致謝。

uj5u.com熱心網友回復：

您在該欄位上有@JsonIgnore，因此它不會被反序列化。

參考這個。

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