Comments on: Improved UUIDField in Django

By: David Underhill

David Underhill — Thu, 28 Jan 2010 20:06:23 +0000

Thanks for sharing – this code works well for me! I’m also experimenting with just using a regular CharField and auto-populating the value using a post_init signal handler.

By: EdMenendez

EdMenendez — Fri, 26 Jun 2009 00:54:29 +0000

I’m using the following for Postgres 8.2.

def db_type(self):
return ‘character varying(32)’

def get_db_prep_value(self, value):
if not value: return
if not isinstance(value, uuid.UUID):
value = uuid.UUID(value)
return value.hex #unicode(value)

By: HenrikV

HenrikV — Tue, 24 Mar 2009 23:08:56 +0000

I originally started out using UUID as primary keys on my old project. I had some trouble with uuid imports in Python 2.5

I seem to recall that if you for some reason try to import uuid in settings.py python will silently crash.

Did you have any trouble like that?

By: Joe

Joe — Thu, 12 Mar 2009 03:57:19 +0000

Ah, sorry, I need varchar(length) on Postgres… but it supports uuid anyway, so I’m using —

def db_type(self):
return ‘uuid’

Although it seems (for me, at least) that get_db_prep_value assumes it’s dealing with a uuid.UUID, when in the admin change view it’s a unicode (and postgresql and other DBs seemingly want a 36 char string anyway…) so I’m using the following,

def get_db_prep_value(self, value):
if not value: return
print type(value)
if isinstance(value, uuid.UUID):
return unicode(value)
return value

By: Joe

Joe — Thu, 12 Mar 2009 02:52:43 +0000

Yeah, for some reason my __init__ doesn’t seem to be called in trunk.

In other words with,

class MyModel(models.Model):
uuid = UUIDField(primary_key=True, db_index=True, auto=True)

I get a character(1) in my DB (postgresql) and thus everything fails… so weird. I can even import the class and UUIDField() with a 1/0 in the init and nothing happens? I assume this has to do with the metaclass or something?

By: David

David — Tue, 10 Mar 2009 19:01:49 +0000

Sorry the original code has been fixed.

However, there seems to be an issue in Django where it’s not quite passing in UUID instances everywhere. I’m currently looking into why.

By: Joe

Joe — Sun, 08 Mar 2009 16:42:38 +0000

What is the variable “name” here (undefined)?

elif version in (3, 5):
self.namespace, self.name = namespace, name

By: trbs

trbs — Tue, 03 Mar 2009 10:15:18 +0000

Any patched for useful improvements to the UUIDField in django-extensions would be much appreciated

By: skabber

skabber — Mon, 02 Mar 2009 18:36:31 +0000

Very nice. Do you know how this compares to the UUIDField in django extensions?

http://code.google.com/p/django-command-extensions/source/browse/trunk/django_extensions/db/fields/__init__.py

By: Brantley Harris

Brantley Harris — Mon, 02 Mar 2009 16:24:58 +0000

Careful, the uuid module is not in 2.4 or below.