public static async Task <Subject> AddAsync(Guid subjectId, Guid studentId)
{
using (var unitOfWork = RepoUnitOfWork.NewTracking <StudentSubjectCore>())
{
var subjectRepository = unitOfWork.Repository <DataLayer.SubjectRepository>();
var studentRepository = unitOfWork.Repository <StudentRepository>();
var subject = await subjectRepository.GetAsync(subjectId, new[]
{
nameof(Subject.Students)
}).ConfigureAwait(false);
if (subject == null)
{
unitOfWork.RollbackTransaction();
return(null);
}
if (subject.Students.Any(stud => stud.Id == subjectId))
{
return(subject.CopyTo <Subject>());
}
var student = await studentRepository.GetAsync(studentId).ConfigureAwait(false);
if (student == null)
{
unitOfWork.RollbackTransaction();
return(null);
}
subject.Students.Add(student);
var updatedSubject = await subjectRepository.UpdateAsync(subject, true).ConfigureAwait(false);
if (updatedSubject == null)
{
unitOfWork.RollbackTransaction();
return(null);
}
unitOfWork.CommitTransaction();
return(updatedSubject.CopyTo <Subject>());
}
}
public static async Task <Group> AddAsync(Guid groupId, Guid studentId)
{
using (var unitOfWork = RepoUnitOfWork.NewTracking <StudentGroupCore>())
{
var groupRepository = unitOfWork.Repository <DataLayer.GroupRepository>();
var studentRepository = unitOfWork.Repository <StudentRepository>();
var group = await groupRepository.GetAsync(groupId, new[]
{
nameof(Group.Students)
}).ConfigureAwait(false);
if (group == null)
{
unitOfWork.RollbackTransaction();
return(null);
}
if (group.Students.Any(stud => stud.Id == groupId))
{
return(group.CopyTo <Group>());
}
var student = await studentRepository.GetAsync(studentId).ConfigureAwait(false);
if (student == null)
{
unitOfWork.RollbackTransaction();
return(null);
}
group.Students.Add(student);
var updatedGroup = await groupRepository.UpdateAsync(group, true).ConfigureAwait(false);
if (updatedGroup == null)
{
unitOfWork.RollbackTransaction();
return(null);
}
unitOfWork.CommitTransaction();
return(updatedGroup.CopyTo <Group>());
}
}