public IHttpActionResult GetPublishings(string publishingType)
        {
            var publishingsByType = publishingService.GetPublishingsByType(publishingType);

            if (publishingsByType != null)
            {
                return(Ok(publishingsByType.Select(p => new { p.Id, p.Title })));
            }
            else
            {
                return(StatusCode(HttpStatusCode.NoContent));
            }
        }