/// <summary>
/// Добавляет преподавателя к журналу
/// </summary>
/// <param name="elGradebookTeacher"></param>
/// <returns></returns>
public async Task AddElGradebookTeacher(ElGradebookTeacher elGradebookTeacher)
{
if (elGradebookTeacher == null)
{
throw new NullReferenceException();
}
if (string.IsNullOrEmpty(elGradebookTeacher.TeacherFio))
{
var appUser = await _context.Users.FirstOrDefaultAsync(u => u.Id == elGradebookTeacher.UserId);
if (appUser == null)
{
throw new NullReferenceException($"Пользователь {elGradebookTeacher.UserId} не найден!");
}
elGradebookTeacher.TeacherFio = appUser.GetFullName;
}
var elGradebook = await GetElGradebookAsync(elGradebookTeacher.ElGradebookId);
var cmp = new ElGradebookTeacherComparer();
if (elGradebook.ElGradebookTeachers.Contains(elGradebookTeacher, cmp))
{
return;
}
_context.Add(elGradebookTeacher);
await _context.SaveChangesAsync();
}
/// <summary>
/// Возвращает список журналов пользователя согласно параметрам фильтра
/// </summary>
/// <param name="filterAndSortModel"></param>
/// <param name="userName"></param>
/// <returns></returns>
public async Task <List <ElGradebook> > GetElGradebooks(ElGradebooksFilterAndSortModel filterAndSortModel, string userName)
{
if (userName == null)
{
return(null);
}
var appUser = await GetAppUserAsync(userName);
if (appUser == null)
{
return(null);
}
var query = GetElGradebooks(filterAndSortModel);
var cmp = new ElGradebookTeacherComparer();
var st = new ElGradebookTeacher();
st.UserId = appUser.Id;
query = query.Where(g => g.ElGradebookTeachers.Contains(st, cmp));
query = query.OrderByDescending(g => g.GroupName);
var result = query.ToList();
return(result);
}
/// <summary>
/// Удаление преподавателя из журнала
/// </summary>
/// <param name="elGradebookTeacher"></param>
/// <returns></returns>
public async Task RemoveElGradebookTeacher(ElGradebookTeacher elGradebookTeacher)
{
var entry = await GetElGradebookTeacherAsync(elGradebookTeacher.ElGradebookTeacherId);
if (entry == null || entry.ElGradebook.ElGradebookTeachers.Count == 1)//Последнего преподавателя не удаляем!
{
return;
}
_context.Remove(entry);
await _context.SaveChangesAsync();
}
/// <summary>
/// Создаёт электронный журнал
/// </summary>
/// <param name="elGradebook"></param>
/// <param name="userName"></param>
/// <returns></returns>
public async Task CreateElGradebook(ElGradebook elGradebook, string userName)
{
var appUser = await GetAppUserAsync(userName);
if (appUser == null)
{
throw new Exception($"Аккаунт пользователя {userName} не найден!");
}
var elGradebookTeacher = new ElGradebookTeacher {
UserId = appUser.Id, TeacherFio = appUser.GetFullName
};
elGradebook.ElGradebookTeachers = new List <ElGradebookTeacher>();
elGradebook.ElGradebookTeachers.Add(elGradebookTeacher);
_context.Add(elGradebook);
await _context.SaveChangesAsync();
}
