为什么 laravel 雄辩的关系返回空数组

Question

My Relationship is 

    public function QuestionOptions()
    {
        return $this->hasMany('App\Models\QuestionOption','QuestionId');
    }

but when i am running this query 

        $builder = Question::select([
            'id', 'type', 'questionText', 'note', 'solutionText',
        ])->with('QuestionOptions')
        ->orderByRaw("RAND()")
        ->skip(0)
        ->take(1)
        ->get()
        ->toArray();

i am getting this 

    {
        "id": 1,
        "type": "multiple",
        "questionText": "2 + 2 = ?",
        "note": null,
        "solutionText": null,
        "question_options": []
    },

so i want to know why i am getting question_options empty is there any problem in my query?

更改后：-

我尝试更改我的查询并删除了选择，所以现在我的查询看起来像这样

        $builder = Question::with('QuestionOptions')
        ->orderByRaw("RAND()")
        ->skip(0)
        ->take(1)
        ->get()
        ->toArray();

运行查询后，我的输出如下所示，我得到了两个表的所有字段，这没问题，但现在出现了问题，我应该如何只获取特定字段

   [{
        "Id": 2,
        "UID": "123456789098765",
        "Type": "single",
        "Rank": 2,
        "QuestionText": "4 + 4 = ?",
        "TotalMarks": 5,
        "Note": null,
        "SolutionText": null,
        "Status": "active",
        "TimeStamp": "2020-11-17 12:04:18",
        "NegativeMark": 2,
        "TestId": 4,
        "question_options": [
            {
                "Id": 13,
                "OptionText": "5",
                "Rank": 1,
                "IsAnswer": "no",
                "Status": "deactive",
                "TimeStamp": "2020-11-17 12:59:14",
                "QuestionId": 2
            },]

Answer 1

试试这个，

       $builder = Question::with('QuestionOptions')
        ->orderByRaw("RAND()")
        ->skip(0)
        ->take(1)
        ->get(['id', 'type', 'questionText', 'note', 'solutionText'])
        ->toArray();