Creating django objects with a random primary key

Why not just encrypt the normal sequential ids instead? To someone who doesn't know the encryption key, the ids will seem just as random. You can write a wrapper that automatically decrypts the ID on the way to the DB, and encrypts it on the way from the DB.

I created a gist based on this question: https://gist.github.com/735861

Following Amber's advice, the private keys are encrypted and decrypted using DES. The encrypted key is represented in base 36, but any other character-based representation will work as long as the representation is unique.

Any model that would need this kind of encrypted private key representation only needs to inherit from the model and manager shown in the code.

Here's the meat of the code:

import structfrom Crypto.Cipher import DESfrom django.db import modelsclass EncryptedPKModelManager(models.Manager):    """Allows models to be identified based on their encrypted_pk value."""    def get(self, *args, **kwargs):        encrypted_pk = kwargs.pop('encrypted_pk', None)        if encrypted_pk:            kwargs['pk'] = struct.unpack('<Q', self.model.encryption.decrypt(                struct.pack('<Q', encrypted_pk)            ))[0]        return super(EncryptedPKModelManager, self).get(*args, **kwargs)class EncryptedPKModel(models.Model):    """Adds encrypted_pk property to children."""    encryption = DES.new('8charkey') # Change this 8 character secret key    def _encrypted_pk(self):        return struct.unpack('<Q', self.encryption_obj.encrypt(            str(struct.pack('<Q', self.pk))        ))[0]    encrypted_pk = property(_encrypted_pk)    class Meta:        abstract = True

For a Transaction object called transaction, transaction.encrypted_pk would return an encrypted representation of the private key. Transaction.objects.get(encrypted_pk=some_value) would search for objects based on the encrypted private key representation.

It should be noted that this code assumes only works for private keys that can be represented properly as long values.

jbrendel created a class that you can simply inherit to get a custom ID.

https://github.com/jbrendel/django-randomprimary