private bool IsModelValid(FeedBacksRecipeViewModel model)
        {
            var recipe = this._context.Recipes.FirstOrDefault(x => x.Id == model.rid);
            var user   = this._context.Users.FirstOrDefault(x => x.Id == model.uid);

            if (recipe != null && user != null && !string.IsNullOrEmpty(model.Text))
            {
                return(true);
            }
            else
            {
                return(false);
            }
        }
 public IActionResult PostComment([FromBody] FeedBacksRecipeViewModel model)
 {
     if (IsModelValid(model))
     {
         this._context.Comments.Add(new Comment()
         {
             recipe = _context.Recipes.FirstOrDefault(x => x.Id == model.rid),
             Text   = model.Text,
             user   = _context.Users.FirstOrDefault(x => x.Id == model.uid),
             Time   = DateTime.Now,
         });
         this._context.SaveChanges();
         return(Ok("OK"));
     }
     else
     {
         return(BadRequest("Invalid request!"));
     }
 }