public void Update(int id, GroupTeacherLesson model)
        {
            if (!Exists(id))
            {
                throw new Exception("Məlumat tapılmadı!");
            }

            var updatedModel = _context.GroupTeacherLessons.FirstOrDefault(x => x.Id == id);

            _context.Entry(updatedModel).State = EntityState.Modified;
            updatedModel.GroupTeacherId        = model.GroupTeacherId;
            updatedModel.LessonId = model.LessonId;
            _context.SaveChanges();
        }
 public int Create(GroupTeacherLesson model)
 {
     _context.GroupTeacherLessons.Add(model);
     _context.SaveChanges();
     return(model.Id);
 }