Unable to fetch _id object from find method.

I have created a some mongo documents via shell

db.users.insert([{ _id: 1, name: "angel" },
    { _id: 2, name: "justin" },
    { name: "rose" }]);

I have queried mongoose find to retrieve all users.

model.find(function (err, users) {
    if (err) {
        console.log(err);
    } else {
        console.log(users);
    }
});

The console shows as

[ { name: 'angel' },
  { name: 'justin' },
  { _id: 51d3c4a113cfcdb762000000, name: 'rose' } ]

It is missing _id in first two records as I have created _id for those records. The third one returns _id.

The schema for users

UserSchema = new Schema({
    name: String
}),

Why I am unable to fetch _id on manually created _id?

[ebensing]

In this case, the ID that you create is a Number. By default, mongoose assumes that _id is an object ID. If you want to be able to get the manually create IDs, you need to specify that in your schema.

[justin-john]

Thank you Valeri.