/// <summary>
/// Creates a view-model for the given enrollment
/// </summary>
/// <param name="enrollment">Model containing the details for the view-model</param>
public EnrollmentViewModel(Enrollment enrollment)
{
if(enrollment != null)
{
Id = enrollment.Id;
Pending = enrollment.Pending;
Class = new ClassViewModel(enrollment.Class);
Student = new UserViewModel(enrollment.Student);
Grade = -1;
}
}
/// <summary>
/// Enrolls a new student into the class
/// </summary>
/// <param name="class">Class to enroll the student in</param>
/// <param name="student">Student to enroll in a class</param>
/// <returns>Null if the an enrollment has already been created. Otherwise, the
/// enrollment that was just created.</returns>
public async Task<Enrollment> RequestEnrollment(Class @class, ApplicationUser student)
{
var status = await (from enrollment in _db.Enrollments
where enrollment.Student.Id == student.Id && enrollment.Class.Id == @class.Id
select enrollment).FirstOrDefaultAsync();
if(status != null)
{
return null;
}
// Create the enrollment as pending
Enrollment newEnroll = new Enrollment { Class = @class, Student = student, Pending = true };
_db.Enrollments.Add(newEnroll);
await _db.SaveChangesAsync();
return newEnroll;
}