public void addDegreeToStudent(int studentId, int degreeId) {
		if(!isValidId(studentId) || !isValidId(degreeId)) {
			return;
		}
		
		Student student = studentDao.getStudent(studentId);
		Degree degree   = degreeDao.getDegree(degreeId);
		
		if(student != null && degree != null) {
			
			for(Degree d : student.getDegrees()) {
				if(degree.getId() == d.getId()) {
					return;
				}
			}
			
			student.getDegrees().add(degree);
			studentDao.saveStudent(student);
		}
	}