public async Task <string> UploadImageAsync(int id, FileModel fileModel)
{
string url = null;
var spot = await repository.GetSpotByIdAsync(id);
if (spot == null)
{
throw new KeyNotFoundException();
}
url = await storageService.AddSpotImageAsync(id, fileModel);
await repository.AddSpotImageAsync(id, url);
return(url);
}