public UserClassGetDto CreateUserClass(UserClassCreateDto userClassCreateDto)
        {
            var userClass = new UserClass
            {
                Grade          = userClassCreateDto.Grade,
                ClassCompleted = userClassCreateDto.ClassCompleted,
                UserId         = userClassCreateDto.UserId,
                ClassId        = userClassCreateDto.ClassId
            };

            _context.Set <UserClass>().Add(userClass);
            _context.SaveChanges();

            var userClassGetDto = new UserClassGetDto
            {
                Id             = userClass.Id,
                Grade          = userClass.Grade,
                ClassCompleted = userClass.ClassCompleted,
                UserId         = userClass.UserId,
                ClassId        = userClass.ClassId
            };

            return(userClassGetDto);
        }
        public IActionResult Post([FromBody] UserClassCreateDto userClassCreateDto)
        {
            var userClass = _userClassRepository.CreateUserClass(userClassCreateDto);

            return(Created("[controller]", userClass));
        }