cooperative-blue/models.js

const MongoClient = require("mongodb").MongoClient;
const ObjectID    = require("mongodb").ObjectID;
const mm          = require('mm')

module.exports = async (dbName, dsn="mongodb://localhost:27017/") => {
    if (!dbName)
        throw new ReferenceError(`db name does not provided`)

    const mongoClient = new MongoClient(dsn, { useNewUrlParser: true });
    const client      = await mongoClient.connect()
    const db          = client.db(dbName)
    const Savable     = mm(db).Savable
    const sliceSavable = mm(db).sliceSavable 

    return {
        Savable, 

        slice(...params){
            return sliceSavable(...params)
        }
    }
}