public IHttpActionResult GetTrainingsAttendee(int id)
        {
            TrainingsAttendee trainingsAttendee = db.TrainingsAttendees.Find(id);

            if (trainingsAttendee == null)
            {
                return(NotFound());
            }

            return(Ok(trainingsAttendee));
        }
        public IHttpActionResult PostTrainingsAttendee(TrainingsAttendee trainingsAttendee)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            db.TrainingsAttendees.Add(trainingsAttendee);
            db.SaveChanges();

            return(CreatedAtRoute("DefaultApi", new { id = trainingsAttendee.Id }, trainingsAttendee));
        }