Question

I’m using mongoose to operate mongodb. Now, for testing, I want to inserting some data into mongodb by native connection.

But the question is how to get the generated id after inserting?

I tried:

var mongoose = require('mongoose');

mongoose.connect('mongo://localhost/shuzu_test');

var conn = mongoose.connection;

var user = {
    a: 'abc'
};

conn.collection('aaa').insert(user);

console.log('User:');
console.log(user);

But it prints:

{ a: 'abc' }

There is no _id field.

Answer 1

You can generate _id yourself and send it to the database.

var ObjectID = require('mongodb').ObjectID;

var user = {
  a: 'abc',
  _id: new ObjectID()
};

conn.collection('aaa').insert(user);

This is one of my favourite features of MongoDB. If you need to create a number of objects, that are linked to each other, you don’t need to make numerous round-trips between app and db. You can generate all ids in the app and then just insert everything.