Can not find a record by it's _id in mongoDB

Question

I want to get a record by its _id like this:

db.user.find({_id : ObjectId("53a095aa4568cb1fef93f681")})

As you can see the record exists:

I think my way is correct according to:

• Why am I unable to find a record by _id in mongodb
• how do I search for an object by its ObjectId in the console?
• Is it ok to use Mongo's "Object ID" as its unique identifier? If so, how can I convert it to a string and look it up by string?

So what's wrong with my code? I'm using RoboMongo.

Answer 1

Your _id field isn't an ObjectId it is just a String.

This should work:

db.user.find({_id : "53a095aa4568cb1fef93f681"})

Mongodocs: https://docs.mongodb.com/v3.2/reference/method/ObjectId/

Answer 2

If you are using python, Try this,

from bson import ObjectId
db.user.find({_id : ObjectId("53a095aa4568cb1fef93f681")})

Answer 3

Sometime it is right to find _id as a str, sometime it is right to find _id as an ObjectId, it depends on where you are.

a. NoSQLBooster/Pymongo:

db.user.find({_id : ObjectId("53a095aa4568cb1fef93f681")})

b. Robo3T/RoboStudio

db.user.find({_id : "53a095aa4568cb1fef93f681"})

Answer 4

Using:

{ _id: new ObjectId('53a095aa4568cb1fef93f681')

It is what worked for me. Try adding new ObjectID('53a095aa4568cb1fef93f681'). It gave me error without using new. Hope that helps