public async Task <Specialty> Create(Specialty speciality)
{
List <Task> tasks = new List <Task>();
var facultyIdExists = _facultyRepository.GetById(speciality.FacultyId);
tasks.Add(facultyIdExists);
var uniqueId = _specialtyRepository.GetById(speciality.Id);
tasks.Add(uniqueId);
var uniqueName = _specialtyRepository.GetByName(speciality.Name);
tasks.Add(uniqueName);
await Task.WhenAll(tasks);
var lectorIdExists = _lectorRepository.GetById(speciality.LectorId) != null;
if (facultyIdExists.Result != null && lectorIdExists && uniqueId.Result == null && uniqueName.Result == null)
{
return(await _specialtyRepository.Create(speciality));
}
else
{
throw new Exception();
}
}