mapstruct - Update existing bean - ignoring 'id' field in all the child/nested beans (arraylists, sets etc..) - mapstruct

Question

I have a parent class with many child entities.
There are 2 instances of this parent class.
Want to copy data of 1 instance to another one (ignoring the 'id' property in all the child entities)
---- hiding getters and setters for brevity
public class IdBean {
private Long id;
}
public class City extends IdBean {
private String name;
}
public class Country extends IdBean {
private String name;
private List<City> cities;
}
public class Student extends IdBean {
private String name;
}
public class School extends IdBean {
private String name;
private List<Student> students;
private List<Country> countries;
}
#MapperConfig(mappingInheritanceStrategy = MappingInheritanceStrategy.AUTO_INHERIT_FROM_CONFIG)
public interface SchoolCentralConfig {
#Mapping(ignore = true, target = "id")
IdBean updateBeanEntityFromDto(IdBean dto);
}
#Mapper(config = SchoolCentralConfig.class)
public interface SchoolMapper {
SchoolMapper INSTANCE = Mappers.getMapper( SchoolMapper.class );
#Mapping(target = "companies.id", ignore = true )
void updateSchoolFromDto(School schoolDTO, #MappingTarget School schoolEntity);
}
I want to ignore all the 'id' property from all the nested fields.

Answer 1

MappingInheritanceStrategy.AUTO_INHERIT_FROM_CONFIG does (unfortunately) not work for nested methods yet.
What you can do is write a signature for Country and Student as well. Then it will work.
So:
#Mapper(config = SchoolCentralConfig.class)
public interface SchoolMapper {
SchoolMapper INSTANCE = Mappers.getMapper( SchoolMapper.class );
void updateSchoolFromDto(School schoolDTO, #MappingTarget School schoolEntity);
void updateStudentFromDto(Student studentDTO, #MappingTarget Student studentEntity);
// etc
}