Node.js map{'；$inc'；：{tags.Key:1}中的增量值使nodejs和mongoose中的newkey命名为Key，而不是Key值

Iam正在尝试增加存储为地图的单个标记

const mongoose = require('mongoose')
const validator = require('validator')
const question = mongoose.model('question', {
    text: {
        type: String,
        required: true
    },
    answers: [
        {
           type: mongoose.Schema.Types.ObjectId,
           ref: "Answer"
        }
     ],
     tags: {
        type: Map,
        of: Number,
        default: 0
    }

})
module.exports = question

但是在为增量发送密钥时

<% question.tags.forEach(tag) %>
    <% function tag(value,key){ %>
        <a href="/question/<%= question._id  %>/ <%= key %>"> 
            <%= key %> 
        </a>
        <p>
        - <%= value %>
        </p>
    <% } %>

我明白了 它添加新的键作为键并递增，我以前的键和图中显示的0值相同

app.get('/question/:id/:key',async (req,res,next) =>{

    const Key = req.params.key
    try{
        await question.findByIdAndUpdate(req.params.id,{'$inc':{"tags.Key": 1}},{new: true})
        .exec()
            res.redirect("back")
    } catch(e){
        console.log(e)
    }
})