如何发送 postman Map 密钥为 object？

Question

I have such an entity structure so I want to send a post request and create Order with all properties. How to request body should look like in postman?

@Entity
public class Order {
    @Id int id;

    String name;

    @ElementCollection
    @CollectionTable(name="INVENTORY", joinColumns=@JoinColumn(name="STORE"))
    @Column(name="COPIES_IN_STOCK")
    @MapKeyJoinColumn(name="MOVIE", referencedColumnName="ID")
    Map<Item, Integer> items;
 
}

@Entity
public class Item {
    @Id long id;
    String name;

}

@RestController
@RequestMapping("api/v1/order")
public class OrderController {

    public final OrderService orderService;

    public OrderController(OrderService orderService) {
        this.orderService = orderService;
    }
    @PostMapping
    public void saveOrder(@RequestBody Order order){
         orderService.save(order);
    }
}

---

this is the wrong body, so I try to find out how it should look according to my data model

{
     "name":"first order",
     "items": {
         "item-1":{
              "name": "frist item"  
         },
         "item-2":{
             "name": "second item"  
         }
     }
}

expect to get the status to receive from the client Order with the whole structure

example from here data what I got screenshot

Answer 1

I think @RequestBody by default cannot handle this example request:

{
     "name":"first order",
     "items": {
         "item-1":{
              "name": "frist item"  
         },
         "item-2":{
             "name": "second item"  
         }
     }
}

For that you should try something like this:

@Entity
public class Order {
    @Id int id;

    String name;

    @ElementCollection
    @CollectionTable(name="INVENTORY", joinColumns=@JoinColumn(name="STORE"))
    @Column(name="COPIES_IN_STOCK")
    @MapKeyJoinColumn(name="MOVIE", referencedColumnName="ID")
    Map<Item, Integer> items;
 
    @JsonAnySetter
    public void addItems(String key, Item item) {
        items.put(item, Integer.valueOf(key.split("-")));
    }
    
}

If you want to count the item's repetition number as a key in the hashmap put your logic in this setter