public async Task <IActionResult> PostAsync([FromBody] SaveDocResource resource)
        {
            var doc    = _mapper.Map <SaveDocResource, Doc>(resource);
            var result = await _docService.SaveAsync(doc);

            if (!result.Success)
            {
                return(BadRequest(new ErrorResource(result.Message)));
            }

            var docResource = _mapper.Map <Doc, DocResource>(result.Resource);

            return(Ok(docResource));
        }