public async Task <IHttpActionResult> DeleteUnenroll(int enrollmentId)
{
try
{
var e = await _enrollments.Find(enrollmentId);
if (e == null)
{
throw new NullReferenceException();
}
if (User.Identity.GetUserId() != e.StudentId && !User.IsInRole("admin"))
{
throw new AuthenticationException();
}
await _enrollments.Unenroll(enrollmentId);
return(Ok());
}
catch (AuthenticationException)
{
ModelState.AddModelError("AuthenticationException", "You don't have authority to enroll this student.");
}
catch (NullReferenceException)
{
ModelState.AddModelError("KeyNotFoundException", "Enrollment not found.");
}
catch (KeyNotFoundException)
{
ModelState.AddModelError("KeyNotFoundException", "Enrollment not found.");
}
catch (StudentNotEnrolledException)
{
ModelState.AddModelError("StudentNotEnrolledException", "Student is not yet enrolled in class.");
}
return(BadRequest(ModelState));
}