I'm creating a rest api using Django and DRF. I don't want to expose IDs 
directly to clients so I'm trying to setup my models like this example:

class AbstractGuidModel(models.Model):
    uuid = models.UUIDField(blank=True, default=uuid.uuid4, unique=True, 

    class Meta:
        abstract = True

class MyModel(AbstractGuidModel):
    name = models.CharField(max_length=NAME_LENGTH)

Since the AbstractGuidModel has default=uuid.uuid4, uuid are generated by 
python code and migrations look like:

CREATE TABLE "MyModel" ( ... "uuid" uuid NOT NULL UNIQUE, ... );

I've read Postgres has an extension for generating automatically uuids.

Once extension is installed, how can I tell django to let database use his 
own extension and not letting him create them with the Python uuid module?

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