public async Task DeleteSubject(int teacherID, string subjectTitle)
{
int subjectID = await _context.Subject.Where(s => s.Title.Equals(subjectTitle)).Select(s => s.Subjectid).FirstOrDefaultAsync();
Teaching teaching = await _context.Teaching.Where(t => t.Userid == teacherID && t.Subjectid == subjectID).FirstOrDefaultAsync();
_context.Remove(teaching);
await _context.SaveChangesAsync();
}
//deletes request if it is denied
public async Task DenyNewSubjectRequest(int requestID)
{
_context.Remove(await GetSubjectRequestByID(requestID));
await _context.SaveChangesAsync();
}