class User extends Collection {
    static connectionName='default' // optional default is the default, for use when creating connectiongs to multiple different servers
    static collectionName='users' // required! name for the collection
    static collectionOptions // optional, collection options object as defined in MongoDB createCollection 
    static collectionIndexes // optional indexes array as defined in db.collection.createIndexes
    static validate(doc){} // optional function if present, is run when new User is invoked, must return {result: doc} if successful 
                         //or {error: message} if validation fails
    static initialDocs // optional, preLoad is preferred, array of docs to write/over write into the collection. Must have _id instantiated as ObjectId. No checks are made before upserting to the database
}

User.preLoad(docs)  // call this with and an array of docs to write/overwrite into the collection. Must have _id, but can be:
                    // {_id: '657a09190323255560f77c3e'}
                    // {_id: {$oid: '657a09190323255560f77c3e'}}
                    // {_id: {Mongodb.ObjectId('657a09190323255560f77c3e')}}
                    // thows an error if duplicate ids
                    // throws an error if no _id
                    // if possibly after Mongo.connect() is called, should:
                    // await User.preLoad(docs)
                    // sets or concatenates to initialDocs

User.setCollectionProps() // required for initialization if possibly after Mongo.connect is called, should: 
                          // await User.setCollectionProps()

const {Mongo}=require(mongo-collections);

// In one place as the server starts up this is needed
await Mongo.connect(uri, options, connectionName)
// uri: if undefined, process.env.MONGODB_URI will be used, or mongodb://localhost:27017
// options: as defined by MongoDB's connect
// connectionName - defaults to 'default' allows you to support connections to multiple database servers

// this can be used in every file in the project
const {Mongo}=require(mongo-collections);

Mongo.db.collection('articles').insertOne({titie: "This is Mongo})

const { Collection }=require('mongo-collections');

class Articles extends Collection {
    static collectionName="articles"
}

Articles.setCollectionProps() // await may be needed if this runs after the Mongo.connect has been called
module.exports.Articles=Articles

const {Mongo}=require('mongo-collections')

async function main() {
    // somewhere before startup of the server
    await Mongo.connect()
}

main()

const {Articles}=require('articles')


async function doSomethingWithArticles(){
    const article=await Articles.findOne({})
}

const {Collection}=require('mongo-collections')

class Users extends Collection {
    static connectionName="users"
    static collectionName="users"
}

Users.setCollectionProps()
module.exports.Users=Users

const {Mongo}=require('mongo-collections')
const {Users}=require('./users')

async function main(){
    await Mongo.connect("URI/To/UsersDBServer",{},'users')
    const user = await Users.findOne({})
}
main()

const {Mongo}=require('mongo-collections')
    async function main(){
    await Mongo.connect("URI/To/UsersDBServer",{},'users')
    const user = await Mongo.dbs['users'].collection('users').findOne({})
}
main()