public Lesson BookNewLesson(Lesson lessonDetails, int teacherId)
{
if (lessonDetails.StudentId == null)
{
throw new Exception("StudentId cannot be null.");
}
int studentId = lessonDetails.StudentId.Value;
IList <Student> studentsInClass = StudentsRepository.GetAllStudentsByTeacher(teacherId);
IList <int> studentIdsList = studentsInClass.Select(s => s.StudentId).ToList();
if (!studentIdsList.Contains(studentId))
{
throw new Exception("You cannot book a lesson for this student.");
}
lessonDetails.UserId = teacherId;
Lesson bookedLesson = LessonsRepository.CreateNewLesson(lessonDetails);
return(bookedLesson);
}
public IList <Student> GetAllStudentsByTeacher(int teacherId)
{
return(StudentsRepository.GetAllStudentsByTeacher(teacherId));
}