What's the reason for new documents in MongoDB having an object instead of an ObjectId?

When adding new entries into mongodb, the ids no longer appear as ObjectId but instead show up as an object.

"_id" : {
        "_bsontype" : "ObjectID",
        "id" : "U\u0013[-Ф~\u001d$©t",
        "generationTime" : 1.43439e+09
}

Anticipated format:

"_id" : ObjectId("55107edd8e21f20000fd79a6")

The version of my mongodb is 3.0.3 and here is the code along with the schema:

var Script = {
    run: function() {
        return CourseModel.findQ()
        .then(function(courses){
            return courses.map(worker);
        }).catch(function(error){
            console.log(error);
        });
    }
};

function worker(course){
    var category = { name: course.name, displayOrder: 0 };
        return CategoryModel.createQ(category).then(function() {
            course.set('name', undefined);
            return course.saveQ();
        });
}
module.exports = Script;

var CategorySchema = new Schema({
    name: {
        type: String,
        required: true,
        unique: true
    },
    active: {
        type: Boolean,
        default: true
    },
    displayOrder: Number,
    updateDate: Date,
    subcategories: [{
        type: Schema.Types.ObjectId,
        ref: 'subcategories'
    }]
});

Answer №1

Essentially, an ObjectID is a special type of object in MongoDB that holds specific properties.

http://docs.mongodb.org/manual/reference/object-id/

An ObjectId is a unique 12-byte BSON type made up of:

  • a 4-byte value representing seconds since the Unix epoch,
  • a 3-byte machine identifier,
  • a 2-byte process id, and
  • a 3-byte counter starting with a random value.
{
    "_bsontype" : "ObjectID",
    "id" : "U\u0013[-Ф~\u001d$©t",
    "generationTime" : 1.43439e+09
}

The binary string U\u0013[-Ф~\u001d$©t is converted into a 24-character hexadecimal string (55107edd8e21f20000fd79a6) when represented as text (using .toString function)

In Mongoose, documents have a getter method .id which returns the 24-character hex string representation.

Answer №2

The issue of malformed ObjectIds is linked to a compatibility problem between the mongoose version and mongoose-q. It is recommended to upgrade to mongoose-q version 0.1.0. I encountered the same problem when using version 0.0.17, so updating should resolve the issue.

Answer №3

Encountered a similar issue over here: Trouble with storing hexadecimal value in ObjectID

Seems to be related to environmental factors and some peculiarities with MongoDB's brew installation. I found that uninstalling via brew and then reinstalling manually resolved the problem. Here's a helpful link for manual installation: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-os-x/

Although I couldn't pinpoint the technical reason behind why it was returning a 12-byte BSON ObjectID instead of a Hexadecimal ObjectID... the solution of uninstalling through brew and performing a manual reinstallation did the trick.

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