CODEWITHSUNDEEP
javaspring-bootjava-8lombokdto
Organik Street
Organik Street

Reputation: 143

How to map @RequestBody payload to builder class

I have an endpoint that gets RequestMessage as a POST body.

I want to map my payload to my java class that uses Lombok with builder pattern and add another variable(myAccountId) to it that is present in my ParentDto which my ChildDto extends.

Below is my implementation in method sendMessage but I don't see myAccountId added in Request Message.

@PostMapping("/sendRequest")
public ResponseEntity<String> sendMessage(@RequestBody RequestMessage payload) {
    final RequestMessage reqDto = payload;
    reqDto.toBuilder()
        .myAccountId(accId)
        .build();
    publishMesaage(reqDto);

    return new ResponseEntity<>(HttpStatus.OK);
}

ChildDTO:

 @Getter
 @ToString
 @SuperBuilder(toBuilder = true)      
 @EqualsAndHashCode(callSuper = false)
 @AllArgsConstructor(access = AccessLevel.PRIVATE)
 public class RequestMessage extends MyDTO {
 private final String name;

 }

ParentDTO

 @Data
 @SuperBuilder(toBuilder = true)
 public abstract class MyDTO implements Serializable {

 @JsonIgnore private final ObjectMapper objectMapper = new ObjectMapper();
 protected String myAccountId;

 protected MyDTO() {}


public static int hashCode(Object... objects) {
    return Arrays.deepHashCode(objects);
}

public static boolean equal(Object o1, Object o2) {
    // implementation of equals method
    return false;
}

Upvotes: 1

Views: 1351

Answers (1)

knittl
knittl

Reputation: 265595

You are never using your newly built object returned by the build() method. You need to assign its return value to a reference, so you can use it. Calling methods on the builder does not magically update the original object.

@PostMapping("/sendRequest")
public ResponseEntity<String> sendMessage(@RequestBody RequestMessage payload) {
    // 1. get a builder from your payload,
    // 2. modify the builder,
    // 3. store the new instance returned by `build` in variable
    final RequestMessage reqDto = payload.toBuilder()
        .myAccountId(accId)
        .build();
    // 4. pass new instance to your other method
    publishMesaage(reqDto);

    return new ResponseEntity<>(HttpStatus.OK);
}

Upvotes: 1

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