[Django]-Using UUIDField in Django keeps creating new migrations

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You should pass the callable as default, not the result of a call, like:

class HasUUID(models.Model):
      name = models.CharField(max_length=10)
      batchid = models.UUIDField(default=uuid.uuid4, unique=True)

Notice that there are no paratheses here to make the call, we thus pass a reference to the uuid4 function itself.

The default= value is not a specific UUID (that is determined when you start the server), it should be a value that is determined when you create a new object (without specifying the batchid yourself).

By passing a callable, Django will understand that the default is the result of a call to the callable, and it will encode that in the migration. By calling the function, you retrieve the result of the call, and each time you run makemigrations, Django will think that you changed your mind on what should be the default value (it will first think you want to use '3b96231c-5848-430b-aa90-b6e41b11fd0a' as default, and later that you want to use '335c3651-b04e-4ed8-a91d-f2da3f53dd8f'). By passing a callable, the value you pass as default remains the same.

👤willeM_ Van Onsem

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