wkshi/app/Question.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Question extends Model
{
    protected $guarded = [];

    const CATEGORY_TEST = 'test';
    const CATEGORY_CARD = 'card';
    public static $categoryMap = [
        self::CATEGORY_TEST => '试题',
        self::CATEGORY_CARD => '打卡'
    ];

    protected $casts = [
        'options' => 'array',
        'answers' => 'array',
    ];

    //
    public function exam()
    {
        return $this->belongsTo(Exam::class);
    }

}