public IQueryable <Listing> GetAllListings()
        {
            var allListings = _dbContext.Query <Listing>()
                              .Where(listing => !listing.Expired);

            return(allListings);
        }
        public IEnumerable <ListingImage> GetAllImages(Guid listingId)
        {
            var allImages = _dbContext.Query <ListingImage>()
                            .Where(i => i.ListingId == listingId)
                            .ToArray();

            return(allImages);
        }