Javascript 创建模块化抽象函数以更新mongodb（mongoose）数据库时遇到问题

我正在尝试创建一组模块化的抽象函数，以便使用节点JS将数据持久化到我的Mongodb（Mongoose）数据库，如下所示：

const mongoose = require('mongoose')
mongoose.connect('xyz123blahblahblah')
const db       = mongoose.connection
const Schema   = mongoose.Schema
const ObjectId = Schema.ObjectId

var doc
var docInstance

// Connect to the database.
function connect() {
    console.log('Establishing a connection.')
    db.on('error', console.error.bind(console, 'Connection error:'))

    db.once('open', function() {
      console.log('Connection established.')
      updateCollection() 
    })
}

function updateCollection(schemaName, schemaObject, schemaProperties) {
    doc         = mongoose.model(schemaName, schemaObject)
    docInstance = new doc(schemaProperties)
}

function save() {
    console.log('Saving document to the collection.')
    docInstance.save(function (err, docInstance) {
        if (err) { return console.error(err) } 
        else { console.log('Document was succesfully added.') }
    })
}

现在的想法是，稍后，我可以导出这些函数并按如下顺序调用它们：

// Define the Collection model.
const User = new Schema( { name: String, email: String, id: ObjectId} )

connect()
updateCollection('users', User, { name: 'Testy McTest', email: 'test@test.co' })
save()

通过connect（）函数传递updateCollection（）函数的参数对我来说没有意义，因为它们基本上负责两件不同的事情，但是需要在connect（）函数内部调用updateCollection（）函数

对我来说，理想的解决方案是具备以下能力：

// Define the Collection model.
const User = new Schema( { name: String, email: String, id: ObjectId} 

connect(updateCollection('users', User, { name: 'Testy McTest', email: 'test@test.co' }))
save()

我现在有点不知道该怎么做。可以用这种方式构造connect（）和updateCollection（）函数以确保关注点分离吗？任何帮助都将不胜感激

var doc
var docInstance

function connect(updateCollection) {
    console.log('Establishing a connection...')
    db.on('error', console.error.bind(console, 'Connection error:'))

    db.once('open', function() {
      console.log('Connection established.')
      updateCollection 
    })
}

function updateCollection(schemaName, schemaObject, schemaProperties) {
    doc = mongoose.model(schemaName, schemaObject)
    for (let i = 0; i < schemaProperties.length; i++) { 
        docInstance = new doc(schemaProperties[i])
        save() 
    }
    /*  
        TODO:
        The connection is currently being closed BEFORE
        all collections have been added to the database.
        We need a way to prevent the connection from closing
        until all Update operations are complete.
    */
    // console.log('Closing the connection.')
    // mongoose.connection.close()
}

function save() {
    console.log('Saving document to the collection...')
    docInstance.save(function (err, docInstance) {
        if (err) { return console.error(err) } 
        else { console.log('Document was succesfully added.') }
    })
}

此外，我还更新了updateCollection（）方法，以在对象数组中获取X个对象来更新数据库中的行：）

connect(updateCollection( 'users', User, [{ name: 'Testy 5', email: 'test5@test.co' }, { name: 'Testy 6', email: 'test6@test.co' }] ))