I tried to have `models.UUIDField` without dash, by using `default=uuid.uuid4().hex` (Instead of `default=uuid.uuid4()`)

```
class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    api_key = models.UUIDField(default=uuid.uuid4().hex, editable=False, unique=True)
    subscription = models.IntegerField(
        choices=[(s.value, s.name) for s in Subscription],
        null=False,
        blank=False
    )

    def __str__(self):
        return str(self.api_key)

```

However, the resultant result still come with dash.

```
django=# select * from users_profile;
 id |               api_key                | secret_key | subscription | user_id
----+--------------------------------------+------------+--------------+---------
  1 | 9da3546c-660c-46c6-adc4-6a13e6ee202b |            |            0 |       1
  2 | 9cbc3a68-7f50-4b18-9e61-7b009f22a0e8 |            |            0 |       2
(2 rows)

```

**May I know how to have models.UUIDField field without dash?**. I would like to store in database without dashes, and use it without dashes.