Base django model

models.py

# For anyone random finding this, yeah, I don't like Django performing the extra query to determine insert vs. update

class BaseModel(models.Model):
    id = models.CharField(primary_key=True, max_length=512)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    version = models.IntegerField(default=1)

    class Meta:
        abstract = True

    def save(self, *args, **kwargs):
        # Determine whether or not this should be an insert or update.
        # Don't let Django ORM perform the extra query to find out.
        if 'force_insert' not in kwargs and 'force_update' not in kwargs:
            force_insert_or_update = ('force_insert' if self.is_new() else
                    'force_update')
            kwargs[force_insert_or_update] = True

        # If we're inserting, make sure we have an ID value
        if kwargs.get('force_insert', False) and not self.id:
            self.id = self.make_id()

        # If we're updating, bump the entity version
        if kwargs.get('force_update', False):
            # TODO here be race conditions!
            # TODO should do a WHERE clause that blows up on version mismatch
            self.version += 1

        super(BaseModel, self).save(*args, **kwargs)

    def is_new(self):
        return not self.id

    def make_id(self):
        return uuid.uuid4().hex

I would say block and force updates through QuerySet, but I think that's how save is implemented... look into this.