public async Task AddAsync(Guid userId, string name, string category, string grade, decimal pricePerHour)
{
var teacher = await _teacherRepository.GetOrFailAsync(userId);
var les = await GetAsync(userId, name, category, grade);
if (les != null)
{
throw new ServiceException(ServiceErrorCodes.LessonAlreadyExists, "Lesson with specific name, category and grade already exists.");
}
var subjectDetails = await _subjectProvider.GetAsync(name, category);
var subject = Subject.Create(subjectDetails.Name, subjectDetails.Category);
var lesson = new Lesson(subject, grade, pricePerHour);
await _teacherRepository.AddLesson(teacher, lesson);
}
public async Task AddLesson(int teacherId, int subjectId) => await _repository.AddLesson(teacherId, subjectId);