Simple Node and MongoDB Interaction

operations.js

var assert = require('assert');

exports.insertDocument = function(db, document, collection, callback) {
    // Get the documents collection
    var coll = db.collection(collection);
    // Insert some documents
    coll.insert(document, function(err, result) {
        assert.equal(err, null);
        console.log("Inserted " + result.result.n + " documents into the document collection "
            + collection);
        callback(result);
    });
};

exports.findDocuments = function(db, collection, callback) {
    // Get the documents collection
    var coll = db.collection(collection);

    // Find some documents
    coll.find({}).toArray(function(err, docs) {
        assert.equal(err, null);
        callback(docs);
    });
};

exports.removeDocument = function(db, document, collection, callback) {

    // Get the documents collection
    var coll = db.collection(collection);

    // Delete the document
    coll.deleteOne(document, function(err, result) {
        assert.equal(err, null);
        console.log("Removed the document " + document);
        callback(result);
    });
};

exports.updateDocument = function(db, document, update, collection, callback) {

    // Get the documents collection
    var coll = db.collection(collection);

    // Update document
    coll.updateOne(document
        , { $set: update }, null, function(err, result) {

            assert.equal(err, null);
            console.log("Updated the document with " + update);
            callback(result);
        });
};

server.js

var MongoClient = require('mongodb').MongoClient,
    assert = require('assert');

var dboper = require('./operations');

// Connection URL
var url = 'mongodb://localhost:27017/conFusion';

// Use connect method to connect to the Server
MongoClient.connect(url, function (err, db) {
    assert.equal(null, err);
    console.log("Connected correctly to server");

    dboper.insertDocument(db, { name: "Vadonut", description: "Test" },
        "dishes", function (result) {
            console.log(result.ops);

            dboper.findDocuments(db, "dishes", function (docs) {
                console.log(docs);

                dboper.updateDocument(db, { name: "Vadonut" },
                    { description: "Updated Test" },
                    "dishes", function (result) {
                        console.log(result.result);

                        dboper.findDocuments(db, "dishes", function (docs) {
                            console.log(docs)

                            db.dropCollection("dishes", function (result) {
                                console.log(result);

                                db.close();
                            });
                        });
                    });
            });
        });
});