public HttpResponseMessage EditListing(ListingDetailDTO listingDTO)
{
Listing listingToEdit = mapper.EditListingEntity(listingDTO);
listingRepo.EditListing(listingToEdit);
var response = Request.CreateResponse <ListingDetailDTO>(HttpStatusCode.Created, mapper.CreateListingDetailDTO(listingToEdit));
string uri = Url.Link("DefaultApi", new { id = listingToEdit.Id });
response.Headers.Location = new Uri(uri);
return(response);
}