如何在流明中將默認屬性定義為空數組

Question

目前我正在使用 mongodb 作為數據庫，我創建了一個集合，其中每個字段都需要輸入數組，如果未提供值，我希望將它們設置為默認空數組。

class Scores extends Eloquent
{
    /**
     * The table associated with the model.
     *
     * @var string
     */
    protected $table = 'AllScore';

    /**
     * The attributes that should be cast.
     *
     * @var array
     *
     */
    protected $casts = [
        
        'y3_score'   => 'array',
        'y4_score'   => 'array',
        'y5_score'   => 'array',
        'y6_score'   => 'array',
    ];

    /**
     * The model's default values for attributes.
     *
     * @var array
     */
    protected $attributes = [
        'y3_score'   => [],
        'y4_score'   => [],
        'y5_score'   => [],
        'y6_score'   => [],
    ];
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'y3_score',
        'y4_score',
        'y5_score',
        'y6_score',
    ];

    /**
     * The attributes excluded from the model's JSON form.
     *
     * @var array
     */
    protected $hidden = [
    ];
}

但是在發布請求時，為該集合創建數據時會返回錯誤

(1/1) ErrorException
json_decode() expects parameter 1 to be string, array given

in HasAttributes.php line 715

at Application->Laravel\Lumen\Concerns\{closure}(2, 'json_decode() expects parameter 1 to be string, array given', '/var/www/html/pathway_ws/LumenConnection/vendor/illuminate/database/Eloquent/Concerns/HasAttributes.php', 715, array('value' => array(), 'asObject' => false))

但是當我刪除這些屬性的默認空數組時，一切正常

Answer 1

我遇到了類似的錯誤（但 Laravel 與 MySql）決定很簡單：

    protected $attributes = [
    'y3_score'   => '[]',
    ...
];

注意 [] 周圍的撇號