UUIDField makemigration error

[Muhamad A.]

As I'm using UUIDField to generate a primary key, when I make migration it returns the following

ValueError: Cannot serialize: UUID('613d3463-b9d6-4bf1-9b62-1e31598b2700')
There are some values Django cannot serialize into migration files.
For more, see https://docs.djangoproject.com/en/1.8/topics/migrations/#migration-serializing

Using the following in models.py

from uuid import uuid4
uuid = models.UUIDField(primary_key=True, default=uuid4(), editable=False)

I managed to make this work by using default=uuid4().hex but the value in the migration file is that generated value

[Claude Paroz]

Re-read the documentation: ​https://docs.djangoproject.com/en/1.8/ref/models/fields/#uuidfield
Note that a callable (with the parentheses omitted) is passed to default, not an instance of UUID.