<?php


namespace app\common\model\store;


use app\common\model\BaseModel;

class CityArea extends BaseModel
{

    public static function tablePk(): ?string
    {
        return 'id';
    }

    public static function tableName(): string
    {
        return 'city_area';
    }

    public function parent()
    {
        return $this->hasOne(self::class,'id','parent_id');
    }

    public function getChildrenAttr()
    {
        return [];
    }

    public function getHasChildrenAttr()
    {
        $count = self::where('parent_id',$this->id)->count();
        return $count ? true : false;
    }

    /**
     * @return \think\model\relation\HasMany|\think\model\relation\HasOne
     */
    public function children()
    {
        return $this->hasMany(self::class, 'parent_id', 'id');
    }
}