how to map list inside class to single object with mapsturct

Question

I want to convert my list inside class to single object.

From :

Class School

private List<SchoolAccount> schoolAccounts;

Class SchoolAccount

private Integer schoolId;

to :

Class SchoolDto

private Integer schoolId;

My mapper class

@Mapper
public interface SchoolMapper {

    SchoolMapper INSTANCE= Mappers.getMapper(SchoolMapper.class);

@Mapping(source = "schoolId", target = "SchoolAccount.schoolId")
    void mergeschoolIdDto(SchoolDto, @MappingTarget School School);