public List <Coupon> GetByCustomerId(int id)
 {
     return(_context.Coupons
            .AsNoTracking()
            .Where(CouponQueries.GetByCustomerId(id))
            .ToList());
 }
 public List <Coupon> GetByCodes(string[] corderArr)
 {
     return(_context.Coupons
            .AsNoTracking()
            .Where(CouponQueries.GetByCodes(corderArr))
            .ToList());
 }