无法从JSON对象中删除字段-节点JS

我有一条生成PDF的路线

featureRoutes.route('/report/').get(function (req, res) {
Feature.find(function (err,features){
if(err){
 console.log(err);
}
else {
pdf.create(features.toString()).toStream(function (err, stream) {
  if (err) return res.send(err);
  res.type('pdf');
  stream.pipe(res);
});
}
});
});

pdf的内容是一个JSON对象，如下所示

    [ { _id: 5ad5ddddcd054b2b5b20143c,
name: 'Project sidebar',
description: '<p>The project sidebar that we previewed in&nbsp;<a href="https://confluence.atlassian.com/jira/jira-6-4-release-notes-678561444.html">JIRA 6.4</a>&nbsp;is here to stay. We built this new navigation experience to make it easier for you to find what you need in your projects. It&#39;s even better, if you are using JIRA Agile: your backlog, sprints, and reports are now just a click away. If you&#39;ve used the sidebar with JIRA Agile before, you&#39;ll notice that cross-project boards, which include multiple projects, now have a project sidebar as well &mdash;&nbsp;albeit a simpler version.</p>\n',
__v: 0 }

及

但是生成的PDF仍然包含id和_V字段

---

如何正确删除节点中的字段？

我在Feature.find的末尾用.select限制了字段

  .select("-__v -_id");

---

可能是数组或json的重复项。从代码上看，它看起来像是数组中的json？可能是

删除功能[0]。\u id

@Macintosh\u 89-它不会删除任何项目，我正在使用节点8.11回答：创建

时如何执行？请参考，它可能会有所帮助。
    delete features.__V

  .select("-__v -_id");