thinkphp5 提示 method not exist:think\db\Query->

model 是这样写的

<?php

namespace lib\model;

use lib\BaseModel;
use lib\model\Provider;

class ProviderCheck extends BaseModel
{
    //
    public function provider()
    {
        return $this->hasOne('provider','id','userid','p','left');
    }
}

调用

 $condition = $this->buildProviderCheckConditon($searchData);
        $providerCheckModel = new ProviderCheck();
        $list  = $providerCheckModel
            ->alias('pc')
            ->provider()
            ->where($condition['condition'])
            ->limit($condition['perpage']*($condition['p']-1), $condition['perpage'])
            ->select();