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I have a project in the cloud9 cloud service with the following code:

var url = "mongodb://localhost:27017/learnyoumongo";
var mongo = require('mongodb-promise').MongoClient;
mongo.connect(url).then((db)=> db.close());

Running the code with node.js engine I get the following error:

{ [Error: Cannot find module '../build/Release/bson'] code: 'MODULE_NOT_FOUND' }
js-bson: Failed to load c++ bson extension, using pure JS version

I am using the node.js v4.4.5 and mongodb-promise v0.0.4

I need to fetch all records from a collection "people" that matches specific criteria and then update each of them.

For that I have this code to find all people:

`return db.collection('people')

.then( (collection) => {
// Store reference to collection for future use
peopleCollection = collection;

return collection.find({a:1})

})`

An then invoke this to update each record:

`.then( (people) => {

// Process each people
return people.each( (person) => {

    person.b = 2;

    // Where peopleCollection is a reference to my collection
    return peopleCollection.update({_id: person._id}, person)
})

})`
I then add another promise chain to fetch all people where b != 2 and I find many records and I counted them. But when I execute this script repeatedly, the count decreases which means mongo is still updating other records when the promise has already resolved.