MongoDB: find by MongoDB ID

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How to find a document by using MongoDB ID

published by chao on Thu, 01/05/2012 - 22:48
Categories:
TechnologyDatabase
MongoDBObjectID
When obtain the ID from request parameter: 4eec06b12dacbe7275000005, it is string, however, the format of _id is ObjectID. String and ObjectID are different types. MongoDB driver provides a function to serialize the 12 character string into a ObjectID type.

var ObjectId = collection.db.original.bson_serializer.ObjectID;
collection.findOne({'_id': ObjectId(idString)}, console.log);
Another way to do it:

var ObjectId = require('mongodb').BSONPure.ObjectID;
collection.findOne({_id: ObjectId(idString)}, console.log);
In MongoDB shell:

> db.foo.findOne({_id: ObjectId(idString)})
Be carefule, it’s ObjectId not ObjectID.