当尝试使用postmapping和put request更新mongo db表中的现有条目时，每次尝试更新新条目时都会在表中创建。。
下面是我的代码控制器

@RestController
@RequestMapping("/expenses")
public class mydataExpController {

@PutMapping("/")
    public mydataExpense updExpenses(@RequestBody mydataExpense exp){
        return expenseServices.updData(exp);

}

服务

@Service
public class ExpenseServices {
    @Autowired
    mydataExpRepository mydataexprepository;

public mydataExpense updData(mydataExpense exp) {
        return mydataexprepository.save(exp);
    }

存储库

@Repository
public interface mydataExpRepository extends MongoRepository<mydataExpense, String> {

}

Postman

connection →keep-alive
content-type →application/json
date →Tue, 29 Dec 2020 10:54:51 GMT
keep-alive →timeout=60
transfer-encoding →chunked

每次我执行http://localhost：8080/费用/投入
在数据库中创建一个新条目