test/app/Http/Models/WorkTask.php

<?php

namespace App\Http\Models;

use Illuminate\Database\Eloquent\Model;

class WorkTask extends Model
{
    protected $primaryKey = 'id';
    protected $table = 'work_task';
    protected $guarded = [];
    protected $casts = [
        'extend' => 'array'
    ];
    
}