java - Clone object without ids using mapstruct

Question

I have an object which contains several list. is there a method to clone this object without id using mapstruct even for the nested object list in an automatic way to be able to persist it.

@Data
public class ParentDto {
  @Id
  private Long id;
  private String name;
  private List<Child1Dto> children1;
  private List<Child1Dto> children2;
}

@Data
public class Child1Dto {
  @Id
  private Long id;
  private String name;
}

@Data
public class Child2Dto {
  @Id
  private Long id;
  private String name;
}

Actual mapper

@Mapper(mappingControl = DeepClone.class)
public interface CloneParentMapper {
  @Mapping(target = "id", ignore = true)
  ParentDto cloneWithoutId(ParentDto parentDto );

  @Mapping(target = "id", ignore = true)
  Child1Dto cloneWithoutId(Child1Dto child1Dto );

  @Mapping(target = "id", ignore = true)
  Child2Dto cloneWithoutId(Child2Dto child2Dto );
}

is there a way to ignore all id without doing @Mapping(target = "id", ignore = true) on every list?

question from:https://stackoverflow.com/questions/65876174/clone-object-without-ids-using-mapstruct

Answer 1

I really feel this is the best and easiest way to ignore fields.

But still if u wanna ignore fields and not mark them as ignored specifically, then you can use constructors based mappings and have a separate constructor without id field. You will have to mark this constructor as @Default.

https://mapstruct.org/documentation/stable/reference/html/#mapping-with-constructors