title: How to have models.UUIDField field without dash
body: <p>I tried to have <code>models.UUIDField</code> without dash, by using <code>default=uuid.uuid4().hex</code> (Instead of <code>default=uuid.uuid4()</code>)</p>
  
  <pre><code>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)
  </code></pre>
  
  <p>However, the resultant result still come with dash.</p>
  
  <pre><code>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)
  </code></pre>
  
  <p><strong>May I know how to have models.UUIDField field without dash?</strong>. I would like to store in database without dashes, and use it without dashes.</p>