public StudentDTOOutSingle AddParentToStudent(string id, StudentDTOInAddParent student)
{
Student studentToUp = GetStudent(student.StudentID);
HashSet <Parent> parents = new HashSet <Parent>();
foreach (var ID in student.ParentID)
{
var parent = parentsService.GetParentID(ID);
parents.Add(parent);
}
studentToUp.Parents = parents;
db.StudentsRepository.Update(studentToUp);
db.Save();
IEnumerable <ParentDTOOut> parentsDTO = parents.Select(x => Utilities.ConverterDTO.SimpleDTOConverter <ParentDTOOut>(x));
StudentDTOOutSingle studentDTO = new StudentDTOOutSingle()
{
Parents = parentsDTO
};
return(studentDTO);
}