public IActionResult Index(LookAttrViewModel model)
        {
            var sql = GenerateSql(model);

            if (string.IsNullOrEmpty(sql))
            {
                return(RedirectToAction("Index"));
            }
            var result = _flights.GetAllView(sql);

            ViewBag.models = result;
            return(View(model));
        }
        private string GenerateSql(LookAttrViewModel model)
        {
            var sql = "";

            if (!string.IsNullOrEmpty(model.CompanyCountry))
            {
                sql += "AND ac.country IN (" + MakeForMySql(model.CompanyCountry) + ") ";
            }
            if (!string.IsNullOrEmpty(model.CompanyName))
            {
                sql += "AND ac.companyname IN (" + MakeForMySql(model.CompanyName) + ") ";
            }
            if (!string.IsNullOrEmpty(model.AirportCountryFrom))
            {
                sql += "AND ha.country IN (" + MakeForMySql(model.AirportCountryFrom) + ") ";
            }
            if (!string.IsNullOrEmpty(model.AirportCountryTo))
            {
                sql += "AND da.country IN (" + MakeForMySql(model.AirportCountryTo) + ") ";
            }
            if (!string.IsNullOrEmpty(model.PlaneModel))
            {
                sql += "AND p.model IN (" + MakeForMySql(model.PlaneModel) + ") ";
            }
            if (model.PlaneSeatsFrom != 0)
            {
                sql += "AND p.seats >=" + model.PlaneSeatsFrom + " ";
            }
            if (model.PlaneSeatsTo != 0)
            {
                sql += "AND p.seats <=" + model.PlaneSeatsTo + " ";
            }
            if (model.FlightDate != DateTime.Parse("01.01.0001 00:00:00"))
            {
                sql += "AND fd.departure >= '" + model.FlightDate.ToString("yyyy-MM-dd HH:mm:ss") + "' AND fd.departure <= '"
                       + model.FlightDate.Date.ToString(@"yyyy-MM-dd") + " 23:59:59' ";
            }
            if (!string.IsNullOrEmpty(model.MustBeWord))
            {
                sql += "AND (MATCH(ha.name) AGAINST ('+" + model.MustBeWord + "' IN BOOLEAN MODE) OR MATCH(da.name) AGAINST ('+" + model.MustBeWord + "' IN BOOLEAN MODE)) ";
            }
            if (!string.IsNullOrEmpty(model.NoWord))
            {
                sql += "AND (NOT MATCH(ha.name) AGAINST ('+" + model.NoWord + "' IN BOOLEAN MODE) AND  NOT MATCH(da.name) AGAINST ('+" + model.NoWord + "' IN BOOLEAN MODE)) ";
            }
            return(sql);
        }