在Express js + MongoDB + PUG中从表单输出中显示表单输入值内的数据

Question

我试图在表单输入值字段中显示来自mongoDB的 - 检索 - 表单输入结果。但是，我收到错误＆＃39;无法读取属性＆未定义的长度＆＃39;。请参阅下面的代码段 - ＆＃39; retrieve.pug＆＃39;正确显示检索到的数据，但无法重新提交，＆＃39; profile.pug＆＃39;如果我尝试在里面显示值，则会抛出错误。任何建议都非常感谢。非常感谢提前!!

以下是代码：

profile.pug - 显示带有检索值的表单输入 - ＆gt;错误！

ul
          each userinfo in userinfos
              form(action='/', method='POST')
                label(for='userinfo[firstName]') First name:
                input(type='text', name="userinfo[lastName]", value=userinfo.firstName)
                label(for='userinfo[lastName]') Last name:
                input(type='text', name="userinfo[lastName]", value=userinfo.lastName)
                label(for='userinfo[streetAddress]') Street address:
                input(type='text', name="userinfo[streetAddress]", value=userinfo.streetAddress)
                label(for='userinfo[state]') State:
                input(type='text', name="userinfo[state]", value=userinfo.state)
                label(for='userinfo[zip]') Zip:
                input(type='text', name="userinfo[zip]", value=userinfo.zip)
                label(for='userinfo[country]') Country:
                input(type='text', name="userinfo[country]", value=userinfo.country)
                label(for='userinfo[city]') city:
                input(type='text', name="userinfo[city]", value=userinfo.country)
                input(type='submit')

app.js - 填写表单输入并将其检索到＆＃39; retrieve.pug＆＃39; =＆gt;显示成功 - 但是，无法重新提交表单！

app.post('/retrieve', function(req, res){
  Userinfo.findOneAndUpdate({_id: req.session.userId }, {$set:{ firstName:
    req.body.firstName, lastName: req.body.lastName, streetAddress: req.body.streetAddress,
    city: req.body.city, state: req.body.state, zip: req.body.zip, country: req.body.country,
    postedBy: req.session.userId}}, {upsert: true, new: true}, function(err, Userinfo){
      if(err){
          if (err) res.json(err);
      }
      res.redirect('/retrieve');
      console.log(Userinfo);
  });
});

app.get('/retrieve', function(req, res){
    Userinfo.find({ _id: req.session.userId }, function(err, docs){
        if(err) res.json(err);
        else    res.render('retrieve', {userinfos: docs});
    });
});