public bool Validate(CreateUserFavoriteRequest requestToValidate)
 {
     return(string.IsNullOrEmpty(requestToValidate.UserId.ToString()) ||
            string.IsNullOrEmpty(requestToValidate.FormationId.ToString()));
 }
        public ActionResult AddUser(CreateUserFavoriteRequest createRequest)
        {
            var newUserFavorite = _repository.AddUserFavorite(createRequest.UserId, createRequest.FormationId);

            return(Created($"/api/userFavorite/{newUserFavorite.Id}", newUserFavorite));
        }