habitica-self-host/migrations/archive/2015/20150906_sync_groups_with_firebase.js

/*
 * Sync groups with Firebase
 */

let mongo = require('mongoskin');
let Firebase = require('Firebase');

let dbserver = 'mongodb://url';
let dbname = 'db';

let db = mongo.db(`${dbserver  }/${  dbname  }?auto_reconnect`);
let dbGroups = db.collection('groups');
let countGroups = 0;

let firebaseRef = new Firebase('https://' + 'firebase-app' + '.firebaseio.com');

// TODO handle sync errors with firebase?
firebaseRef.authWithCustomToken('firebase-secret', function (err, authData) {
  if (err) throw new Error('Impossible to authenticate Firebase');

  console.log('Firebase connected, begins work on db');

  dbGroups.findEach({}, {_id: 1, members: 1}, {batchSize: 100}, function (err, group) {
    if (err) throw err;
    if (group._id !== 'habitrpg') return;

    countGroups++;
    console.log('Group: ', countGroups);

    firebaseRef.child(`rooms/${  group._id}`)
      .set({
        name: group.name,
      });

    group.members.forEach(function (member) {
      firebaseRef.child(`members/${  group._id  }/${  userId}`)
        .set(true);

      firebaseRef.child(`users/${  member  }/rooms/${  group._id}`)
        .set(true);
    });
  });
});