private User Convert(UserModel userModel)
        {
            var user = new User()
            {
                Id = userModel.Id,
                FirstName = userModel.FirstName,
                LastName = userModel.LastName,
                BirthDate = userModel.BirthDate,
                Email = userModel.Email,
                Login = userModel.Login,
                Password = userModel.Password,
            };

            return user;
        }
        private UserModel Convert(User user)
        {
            var userModel = new UserModel()
            {
                Id = user.Id,
                FirstName = user.FirstName,
                LastName = user.LastName,
                BirthDate = user.BirthDate,
                Email = user.Email,
                Login = user.Login,
                Password = user.Password,
                Roles = user.Roles.Select(r => r.Name)
            };

            return userModel;
        }