Question

I want to retrieve the last inserted _id, using mongoose as MongoDB wrapper for node.js. I’ve found the following tutorial, but I can’t change any node modules because the app runs on a public server:

Getting “Last Inserted ID” (hint – you have to hack Mongoose)

Any other ideas? This what I want to do:

• Insert new user
• Get user’s _id value
• Set a new session based on user’s id
• Redirect to /

Thanks!

Answer 1

I’m using mongoose version 1.2.0 and as soon as I created a new instance of a mongoose model, the _id is already set.

coffee> u = new User()
[object Object]
coffee> u._id
4dd68fc449aaedd177000001

I also verified that after I call u.save() the _id remains the same. I verified via MongoHub that this is indeed the real ID saved into MongoDB.