Querying a MongoDB based on Mongo ID in a node.js app

Question

I\'m using a node.js and mongodb, and I\'m trying to query the database based on the mongo generated ID using the following:

    collection.findOne( {_id:doc         


        

Answer 1

First, ensure you've added all required modules in MongoDB config:

var mongo = require('mongodb'),
    Server = mongo.Server,
    Db = mongo.Db,
    ObjectID = require('mongodb').ObjectID;
var BSON = require('mongodb').BSONPure;
var server = new Server('localhost', 27017, {
    auto_reconnect: true
});
var db = new Db('YOUR_DB_NAME', server);

Then, when you try to find an object in collection by _id, use:

//let id = your _id, smth like '6dg27sh2sdhsdhs72hsdfs2sfs'...
var obj_id = BSON.ObjectID.createFromHexString(id);
db.collection("NAME_OF_COLLECTION_WHERE_IS_YOUR_OBJECT", function(error, collection) {
    collection.findOne( {_id:obj_id} , function(err, item) {
        // console.log ( item.username );
    });
});

Hope, this works.