Laravel 多对多关系的 Carbon 中缺少数据

Question

我最近将我的数据库从 MySql 更改为 MSSql，但我遇到了日期格式问题。我将所有模型更改为使用 $dateFormat = 'Y-m-d H:i:s' 并且工作正常，但是今天我遇到了与其他模型具有多对多关系的模型的问题。

我的数据库以 Y-m-d H:i:s.000 格式保存日期，即 2018-08-20 16:01:12.000。我认为雄辩不尊重日期格式。

我正在使用 Laravel 5.4 和 php 5.6；

今天，我收到了这个错误

InvalidArgumentException in Carbon.php line 909:
Data missing

in Carbon.php line 909

at Carbon::createFromFormat('Y-m-d H:i:s.000', '2018-07-19 10:40:21') in Model.php line 3003

产生错误的代码，

public function getDetailQuiz()
{
    $quiz_id = Input::get('quiz_id');

    *$quiz = QuizTopic::with('questions.answers')->where('id', $quiz_id)->first();*

    foreach ($quiz->questions as $question) {
        $answers = [];
        $answer_order = 0;

        foreach ($question->answers as $i => $answer) {
            $answers[] = ['answer' => $answer->description, 'id' => $answer->id, 'action' => 'update'];

            if ($question->answer_id == $answer->id) $answer_order = $i;
        }

        $response['questions'][] = [
            'id'             => $question->id,
            'question'       => $question->description,
            'correct_answer' => $question->answer_id,
            'points'         => $question->points,
            'answers'        => $answers,
            'action'         => 'update',
            'answer_order'   => $answer_order,
        ];
    }

    $quiz->start_date = Carbon::parse($quiz->start_date)->format('d/m/Y H:i');
    $quiz->end_date = Carbon::parse($quiz->end_date)->format('d/m/Y H:i');

    $response['quiz'] = $quiz->makeVisible(['award_value', 'type_id', 'start_date', 'end_date'])->toArray();


    return response()->json(['result' => $response]);
}

我的测验主题模型

class QuizTopic extends Model
    {
        protected $table   = 'quiz_topics';
        protected $guarded = ['id'];
        protected $hidden  = [
            'created_at',
            'updated_at',
            'deleted_at',
            'created_user_id',
            'updated_user_id',
            'winner_clerk_id',
            'award_value',
            'status_id',
            'type_id',
            'start_date',
            'end_date',
            'raffle_date',
            'fcm_notification_reference',
        ];
        protected $dateFormat = 'Y-m-d H:i';

        use SoftDeletes;

        public function questions()
        {
            return $this->belongsToMany('App\Models\QuizQuestion', 'rel_topics_questions', 'topic_id', 'question_id')->withTimestamps();
        }


    }

我的测验问题模型

class QuizQuestion extends Model
    {
        protected $table   = 'quiz_questions';
        protected $guarded = ['id'];
        protected $hidden  = ['created_at', 'updated_at', 'deleted_at','points','pivot','created_user_id','updated_user_id'];
        protected $dateFormat = 'Y-m-d H:i:s';

        use SoftDeletes;

        public function topics()
        {
            return $this->belongsToMany('App\Models\QuizTopic');
        }

        public function answers()
        {
            return $this->belongsToMany('App\Models\QuizAnswer', 'rel_questions_answers', 'question_id', 'answer_id')->withTimestamps();
        }
    }

Answer 1

来自手册：

默认情况下，时间戳的格式为“Y-m-d H:i:s”。如果你需要 自定义时间戳格式，设置 $dateFormat 属性 模型。此属性确定日期属性如何存储在 数据库，以及模型序列化为 数组或 JSON

（强调我的）

由于您将日期保存为 Y-m-d H:i:s.000，因此您需要在两个模型中设置 $dateFormat 属性：

protected $dateFormat = 'Y-m-d H:i:s.000';

更改并重试。