How can I create unique IDs for embedded documents in MongoDB?

Question

So I need to reference particular subdocuments uniquely from items in my collection. For instance:

User = {
    \'name\': \'jim\',
    \'documents: [
        {\         


        

Answer 1

With mongoengine create a ObjectId in an embedded document like this:

from bson.objectid import ObjectId

class Address(EmbeddedDocument):
    _id = ObjectIdField( required=True, default=lambda: ObjectId() )
    street = StringField()