weixin/app/Repositories/Models/Mentor/Grade.php

<?php

namespace App\Repositories\Models\Mentor;

use App\Repositories\Models\Model;
use Carbon\Carbon;
use Illuminate\Support\Facades\Cache;

class Grade extends Model
{
    /**
     * @var string
     */
    protected $table = 'mentor_grades';

    protected $guarded = [];

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

    public static function byNameAndCreate($name)
    {
        return Cache::remember("model:Grade:byNameAndCreate:{$name}", Carbon::now()->addHours(1), function () use ($name) {
            $model = self::query()->firstOrCreate([
                'name' => trim($name)
            ], []);
            return $model;
        });
    }
}