Spring Data Rest - hide instead of exposing ID

Question

I have en entity class which has an natural ID field mapped as @Id and I don't have any surrogate ID(invented field only for table ID) field. And, in the Jackson marshalled JSON I see an extra id exposed.

So instead of:

{
    "bin":"123456", ...
}

I see:

{
    "id":"123456", "bin":"123456", ...
}

which I don't want because they are repeated information. How can I prevent this?

I haven't touched REST/MVC configuration adapter; they are for exposing the ID classes, but I don't want that.

Bean:

@Entity
@Data
@Table(name="bin_info")
public class BinInfo implements Serializable, Persistable<String> {
    @Id
    @NotBlank //this is for absent parameter. Not equal to Pattern regex check
    @Pattern(regexp = "^\\d{6,8}$") //6-8 digits
    @Column(name="bin")
    @JsonProperty("bin")
    private String bin;

    ...

I am with these dependencies:

dependencies {
    compile('org.springframework.boot:spring-boot-starter-actuator')
    compile('org.springframework.boot:spring-boot-starter-aop')
    compile('org.springframework.boot:spring-boot-starter-data-jpa')
    compile('org.springframework.boot:spring-boot-starter-data-rest')
    compile('org.springframework.boot:spring-boot-starter-web')
    compile('org.springframework.boot:spring-boot-starter-undertow')
    runtime('com.h2database:h2')
    runtime('org.postgresql:postgresql')
    testCompile('org.springframework.boot:spring-boot-starter-test')
    testCompile('io.cucumber:cucumber-java:3.0.2')
    testCompile('io.cucumber:cucumber-junit:3.0.2')
    testCompile('io.cucumber:cucumber-spring:3.0.2')
}

Spring Boot 2.0.3.

Answer 1

Thanks all, I think it has to do with some configuration of Spring or Jackson that will automatically expose the field mapped with @Id. I can just guess because no time for a confirmation.

And some colleague suggests me to define a DTO instead of putting the @Jsonxxx annotations in the class, saying the model represents data model and are related to the table, while DTO is related with view layer. So I did it and now all is fine.

Now the model is free of id field and @JsonProperty/@JsonIgnore:

@Entity
@Data
@Table(name="bin_info")
public class BinInfo implements Serializable, Persistable<String> {
    @Id
    @NaturalId
    @NotBlank //this is for absent parameter. Not equal to Pattern regex check
    @Pattern(regexp = "^\\d{6,8}$") //6-8 digits
    @Column(name="bin")
    //@JsonProperty("bin")
    private String bin;

    ...

And the DTO is totally without @Id:

@Data
public class BinInfoDTO {
    @JsonProperty("bin")
    private String bin;

    @JsonProperty("json_full")
    private String json_full;

    ...

When I retrieve an entity, with a mapping method I set all values I need in a DTO to the DTO and return it to the endpoint. Then the JSON is normal and fine.