问laravel 8 serializeDate()必须实现接口DateTimeInterface，

EN

<?php

namespace App\Models;

use Carbon\Carbon;
use DateTimeInterface;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasOne;

class User extends Model
{
    protected $table    = 'users';
    protected $hidden   = ['id', 'password', 'role_id'];
    protected $fillable = ['slack', 'user_code', 'fullname', 'email', 'password', 'init_password', 'phone',
                           'profile_image', 'role_id', 'status', 'is_admin', 'created_by', 'updated_by'];

    

    public function parseDate($date): ?string
    {
        return ($date != null) ? Carbon::parse($date)->format(config("app.date_time_format")) : null;
    }

    /**
     * Prepare a date for array / JSON serialization.
     *
     * @param  \DateTimeInterface  $date
     * @return string
     */
    public function serializeDate(DateTimeInterface $date)
    {
        return $date->format('Y-m-d H:i:s');
    }
}

<?php

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;

class UserResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param \Illuminate\Http\Request $request
     * @return array
     */
    public function toArray($request)
    {
        return [
            'slack'            => $this->slack,
            'user_code'        => $this->user_code,
            'created_at_label' => $this->serializeDate($this->created_at),
            'updated_at_label' => $this->serializeDate($this->updated_at),
            'created_by'       => $this->createdUser,
            'updated_by'       => $this->updatedUser
        ];
    }
}