Student.findOne({id:3}).populate('courses').exec(function(err, thisStudent) {
	for (i = 0; i < thisStudent.courses.length; i++) {
		var uc = thisStudent.courses[i].unit_code;
		Course.findOne({unit_code = uc}).populate(‘lecturestreams’).exec(function(err, thisCourse) {

			res.view() {
				course: ?????????
			}

		}
	}
});