public IActionResult Post(GroupCreateViewModel model)
        {
            if (this.ModelState.IsValid)
            {
                Group group = model.ToGroupEntity();
                var   repo  = this.Storage.GetRepository <IGroupRepository>();

                repo.Create(group, GetCurrentUserName());
                this.Storage.Save();

                return(Ok(new { success = true, data = group }));
            }

            return(BadRequest(new { success = false }));
        }