public async Task <IActionResult> GetAbsent(IEnumerable <Absent> absents)
{
var isInsert = false;
if (!context.Absent.Any(a => a.DateAbsent.Date == DateTime.Today && a.StudentId == absents.First().StudentId))
{
await context.AddRangeAsync(absents);
SaveStudentAbsent(absents);
await context.SaveChangesAsync();
isInsert = true;
}
return(Ok(new { isInsert = isInsert }));
}