course-site/app/Repositories/Models/School/Grade.php

<?php

namespace App\Repositories\Models\School;

use App\Repositories\Enums\ModelStatusEnum;
use App\Repositories\Models\Model;
use Carbon\Carbon;
use Illuminate\Support\Facades\Cache;
use Prettus\Repository\Contracts\Transformable;
use Prettus\Repository\Traits\TransformableTrait;

/**
 * Class Grade.
 *
 * @package namespace App\Repositories\Models\School;
 */
class Grade extends Model implements Transformable
{
    use TransformableTrait;

    protected $table = 'school_grades';
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $guarded = [];


    /**
     * 根据name获取班级id
     * @param $name
     * @return mixed
     */
    public static function byNameGetId($name, $is_create = false)
    {
        return Cache::remember('model:Grade:byNameGetId:' . $name, Carbon::now()->addDay(), function () use ($name, $is_create) {
            $id = self::query()->where('name', $name)->value('id') ?? 0;
            if ($id) return $id;
            if (!$is_create) return $id;
            $model = self::query()->create(['name' => $name]);
            return $model['id'];
        });
    }

    public function getStudentNumsAttribute()
    {
        return Student::query()->where('grade_id', $this->attributes['id'])->where('status', ModelStatusEnum::OK)->count();
    }
}