fastadmin搜索添加不存在的字段

$filter = json_decode($this->request->get('filter'), true);
$op = json_decode($this->request->get('op'), true);
$code = isset($filter['code']) ? $filter['code'] : '';
$code_op = isset($op['code']) ? $op['code'] : "";
unset($filter['code']);
unset($op['code']);
if ($code) {
    $goods_ids = db('goods_sku')->where("bianhao", "like", "%$code%")->column('goods_id');
    if (!empty($goods_ids)) {
        $filter['goods.id'] = $goods_ids;
        $op['goods.id'] = 'in';
    }
}
$this->request->get(['filter' => json_encode($filter)]);
$this->request->get(['op' => json_encode($op)]);
list($where, $sort, $order, $offset, $limit) = $this->buildparams();