[FIXED] mapstruct can not map property list of model to list of String

Issue

how can I map difference model list string to list model my code below;

my TaskList.class

@Getter
@Setter
private List<TaskGroupList> groupIds;

my TaskResponse.class

@Getter
@Setter
private List<String> groupIds;

My TaskGroupList class

@Getter
@Setter
private String ownerId;

My TaskListMapper.class

 public abstract List<TaskResponse> toAllTaskListResponse(List<TaskList> taskList);

Solution

For mapping to a List, I think you need to use IterableMapping annotation. Refer below link -

https://mapstruct.org/documentation/stable/reference/html/#implicit-type-conversions

It has an example for list to list conversion

@Mapper
public interface CarMapper {
  @IterableMapping(numberFormat = "$#.00")
  List<String> prices(List<Integer> prices);
}

So, in your scenario, you could use the annotation. Also, as there is a List of List Objects, nested iterations are needed as below -

@IterableMapping(qualifiedBy = IterableMapping.class)
List<TaskResponse> toAllTaskListResponse(List<TaskList> taskList);

@IterableMapping(qualifiedByName = "taskGroup")
List<String> map(List<TaskGroupList> task);

@Named("taskGroup")
default String map(TaskGroupList t) {
    return t.getOwnerId();
}

Answered By - SKumar