What is the process of starting a mongoDB instance within a JavaScript class?

Question

What is the process of starting a mongoDB instance within a JavaScript class?

I have a DB class that is built with a mongoDB connection, but I am uncertain about how to initiate a db instance within this setup.

import mongo from 'mongodb'
import Grid from 'gridfs-stream'

export default class Db {
  constructor () {
    this.connection = new mongo.Db('db', new mongo.Server('127.0.0.1', 27017))
  }

  async dropDB () {
    const Users = this.connection.collection('users')
    await Users.remove({})
  }
}

In what way can I utilize this in my class?

db.open(function (err) {
  if (err) return handleError(err);
  var gfs = Grid(db, mongo);
})

javascript mongodb gridfs-stream

Answer 1

Answer №1

The choice of approach would heavily depend on the desired style, but a potential implementation could look something like this:

const { promisify } = require('util');

export default class Database {
    constructor (url) {
            this.url = url || DEFAULT_DATABASE_URL;
            this.db = null;
            this.gfs = null;
            this.connection = new mongo.Db('db', new mongo.Server('127.0.0.1', 27017));
            
            // This part is untested but theoretically should function correctly
            this.connection.open = promisify(this.connection.open);
            this.connected = false;

            return this;
      }

    async connect(message) {
            let self = this;
            if(!this.db){
                try {
                    await self.connection.open();
                    self.gfs = Grid(self.connection, mongo);                 
                    this.connected = true;
                } catch (error){
                    log.info('Error connecting to MongoDB');
                }
            }
            return this;
        }

        isConnected() {
            return this.connected;
        }
}

Answer 2

The choice of approach would heavily depend on the desired style, but a potential implementation could look something like this:

const { promisify } = require('util');

export default class Database {
    constructor (url) {
            this.url = url || DEFAULT_DATABASE_URL;
            this.db = null;
            this.gfs = null;
            this.connection = new mongo.Db('db', new mongo.Server('127.0.0.1', 27017));
            
            // This part is untested but theoretically should function correctly
            this.connection.open = promisify(this.connection.open);
            this.connected = false;

            return this;
      }

    async connect(message) {
            let self = this;
            if(!this.db){
                try {
                    await self.connection.open();
                    self.gfs = Grid(self.connection, mongo);                 
                    this.connected = true;
                } catch (error){
                    log.info('Error connecting to MongoDB');
                }
            }
            return this;
        }

        isConnected() {
            return this.connected;
        }
}

What is the process of starting a mongoDB instance within a JavaScript class?

Answer №1

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