public async Task <ActionResult <float> > AddOcena(string naziv, short val)
        {
            OcenaRente ocena = new OcenaRente();

            ocena.kompanija = naziv;
            ocena.Value     = val;
            _context.OceneRente.Add(ocena);

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (GetOcenaKola(naziv) == null)
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }
            return(NoContent());
        }
        public async Task <ActionResult <bool> > OceniRentu()
        {
            var    request = HttpContext.Request.Form.Keys.ToList <string>();
            string naziv   = request[0];
            int    ocena   = int.Parse(request[1]);
            string user    = request[2];

            List <OcenaRente> ocene = await _context.OceneRente.ToListAsync();

            foreach (OcenaRente oc in ocene)
            {
                // renta vec ocenjena
                if (oc.Username == user && oc.kompanija == naziv)
                {
                    return(false);
                }
            }
            OcenaRente o = new OcenaRente();

            o.kompanija = naziv;
            o.Username  = user;
            o.Value     = ocena;

            _context.OceneRente.Add(o);
            await _context.SaveChangesAsync();

            return(true);
        }