public async Task <IActionResult> Post([FromBody] ApplicationCore.Models.Question question)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest());
            }
            if (question.QuestionChoices.Count < 4)
            {
                return(BadRequest("Question must have at least 4 choices."));
            }
            if (!await _questionRepo.CategoryExistsAsync((int)question.CategoryId))
            {
                return(BadRequest($"Category with id {question.CategoryId} does not exist."));
            }

            var createdItem = await _questionRepo.AddQuestionAsync(question);

            return(CreatedAtAction(
                       actionName: nameof(Get),
                       routeValues: new { id = createdItem.QuestionId },
                       value: createdItem));
        }