The id type of full object and the id type of the lazy object are different

[Canicio]

• Models:

import datetime
import uuid
from mongoengine import *

class Model1(Document):
    id = UUIDField(primary_key=True, default=uuid.uuid4, binary=False)
    attr1 = StringField(required=True)
    attr2 = IntField()
    attr3 = BooleanField()
    creation_date = DateTimeField(default=datetime.datetime.utcnow)
    meta = {
        'db_alias': 'testdb',
        'collection': 'model1'
    }


class Model2(Document):
    id = UUIDField(primary_key=True, default=uuid.uuid4, binary=False)
    attr1 = StringField()
    reference_field = LazyReferenceField('Model1', dbref=True)
    creation_date = DateTimeField(default=datetime.datetime.utcnow)
    meta = {
        'db_alias': 'testdb',
        'collection': 'model2'
    }

• Insert sample data (NOTE: the Earth object reference the Moon object):

moon = Model1()
moon.attr1 = 'Moon'
moon.attr2 = 22
moon.attr3 = False
moon.save()

earth = Model2()
earth.attr1 = 'Earth'
earth.reference_field = moon
earth.save()

• If I check that the Earth object references the moon object by comparing ids, the result is that it does not

earth = Model2.objects.get(attr1='Earth')
moon = Model1.objects.get(attr1='Moon')
if earth.reference_field.id == moon.id:
    print('The Earth reference to the Moon')
else:
    print('The Earth does NOT reference to the Moon')
# OUTPUT: The Earth does NOT reference to the Moon    <-- ¿WTF?

• The cause is that the id type of full object is UUID and the id type of the lazy object is string:

print('Types ids:', type(moon.id), type(earth.reference_field.id))
# OUTPUT: Types ids: <class 'uuid.UUID'> <class 'str'>    <-- the ids have different types!!!!

I can't use LazyReference objects if I can't easily compare ids without doing conversions.