Foreign key returns nulls with JSON - json

Question

I have two models and when i try to add a new file the file_id is null.No error message it works fine except that null. How can I fix that?
Customer :
#NoArgsConstructor
#AllArgsConstructor
#Data
#Builder
#Entity
#Table(name = "customer")
public class Customer {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String CustomerName;
private String email;
#OneToMany(mappedBy = "customer", cascade = CascadeType.ALL, orphanRemoval = true)
private List<File> File = new ArrayList<>();
}
File :
#NoArgsConstructor
#AllArgsConstructor
#Data
#Builder
#Entity
#Table(name = "file")
public class File implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String file_name;
#ManyToOne
#JoinColumn(name="customer_id")
private Customer Customer;
}
Repository :
#Repository
public interface FileRepository extends JpaRepository <File,Integer> {
}
FileDTO :
#Data
public class FileDTO {
private String file_name;
private Customer customer;
CustomerDTO:
#Data
public class CustomerDTO {
private String customernamesurname;
private String email;
private Customer customer;
}
I think problem is in mapper class. I want to add integer.
FileMapper :
public class FileMapper {
public static FileDTO toDto(File file){
File DTO fileDTO = new FileDTO();
fileDTO.setFile_name(file.getFile_name());
fileDTO.setCustomer(file.getCustomer());
return fileDTO;
}
public static File toEntity(FileDTO fileDTO){
File file = new File();
file.setFile_name(fileDTO.getFile_name());
file.setCustomer(fileDTO.getCustomer());
return file;
}
CustomerMapper:
public class CustomerMapper {
public static CustomerDTO toDto(Customer customer){
CustomerDTO customerDTO = new CustomerDTO();
customerDTO.setCustomernamesurname(customer.getCustomernamesurname());
customerDTO.setEmailcustomer.getEmail());
return customerDTO;
}
public static Customer toEntity(CustomerDTO customerDTO){
Customer customer = new Customer();
customer.setCustomernamesurname(customerDTO.getCustomernamesurname());
customer.setEmail(customerDTO.getEmail());
return customer;
}
}
Controller :
#PostMapping(path = "/addFile")
public boolean addFile(#RequestBody FileDTO File) {
return FileService.addFile(FileMapper.toEntity(file));
}
FileImplemantion :
#Override
public boolean addFile(File file) {
File save = fileRepository.save(file);
if (save == null)
return false;
return true;
}
PostgreSql :
DROP TABLE IF EXISTS customer CASCADE;
DROP TABLE IF EXISTS user CASCADE;
DROP TABLE IF EXISTS file CASCADE;
CREATE TABLE customer(
id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
customernamesurname VARCHAR(100) NOT NULL,
email VARCHAR(50) NOT NULL
);
CREATE TABLE user(
id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
user_name VARCHAR(100) NOT NULL,
user_password VARCHAR(50) NOT NULL
);
CREATE TABLE file(
id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
file_name VARCHAR(100) NOT NULL,
customer_id INT,
FOREIGN KEY (customer_id) REFERENCES customer (id)
);
I want to add File with JSON Content and use customer_id as foreign key. But customer_id returns null when I add file.
It works fine with customer. But I want only add file like these :
{
"file_name": "Test",
"customer_id": 2
}
It adds name but customer_id is null with that concept

Answer 1

You need change FileDTO:
#Data
public class FileDTO {
#JsonProperty("file_name")
private String fileName;
#JsonProperty("customer_id")
private int customerId;
}
Get customer by Id and set for File Enity
#PostMapping(path = "/addFile")
public boolean addFile(#RequestBody FileDTO file) {
Customer customer = customerRepository.findById(file.getCustomerId())
.orElseThrow(EntityNotFoundException::new);
return fileService.addFile(FileMapper.toEntity(file, customer));
}
public class FileMapper {
public static File toEntity(FileDTO fileDTO, Customer customer) {
File file = new File();
file.setFile_name(fileDTO.getFileName());
file.setCustomer(customer);
return file;
}
}