如何在流明中将默认属性定义为空数组

Question

目前我正在使用 mongodb 作为数据库，我创建了一个集合，其中每个字段都需要输入数组，如果未提供值，我希望将它们设置为默认空数组。

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 = [
    ];
}

但是在发布请求时，为该集合创建数据时会返回错误

(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))

但是当我删除这些属性的默认空数组时，一切正常

Answer 1

我遇到了类似的错误（但 Laravel 与 MySql）决定很简单：

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

注意 [] 周围的撇号