public ActionResult CreateOwner([FromBody] NewCarOwner ownerRequest) { if (!ModelState.IsValid) { return(BadRequest("Model state not valid")); } var model = new CarOwner { CarId = ownerRequest.CarId, Period = ownerRequest.Period, Owner = ownerRequest.Owner, OwnerContent = ownerRequest.OwnerContent, }; _carService.AddCarOwner(model); return(Ok($"Car owner created: {model.Owner}")); }