public async Task <IActionResult> GradeStudent(int id, string studentId, Grade grade)
{
if (studentId is null)
{
return(BadRequest());
}
var userId = userManger.GetUserId(User);
if (!await trainers.IsTrainer(id, userId))
{
return(BadRequest());
}
var success = await trainers.AddGrade(id, studentId, grade);
if (!success)
{
return(BadRequest());
}
return(RedirectToAction(nameof(Students), new { id }));
}