API key Django model for use with Oauth Client

apikey.py

from uuidfield import UUIDField
from django.contrib import admin


class APIKey(models.Model):
    apikey = UUIDField(auto=True)
    url = models.CharField(max_length=255, blank=True, null=True)
    client = models.ForeignKey(Client, related_name='apikeys')
    scope = models.CharField(max_length=64, blank=True, null=True)
    active = models.BooleanField(default=True)
    deprecate = models.BooleanField(default=True)

    def save(self, *args, **kwargs):
        """
        The save method gets any deprecateable keys that are
        currently active with the same scope and invalidates them
        """
        previous = APIKey.objects.filter(
            client=self.client, deprecate=True, active=True, scope=self.scope)
        previous.update(active=False)
        super(APIKey, self).save(*args, **kwargs)

    def __unicode__(self):
        rep = (
            self.scope, self.active, self.client.name,
            self.client.id, self.apikey)
        return u"%s(%s) %s[%s] %s" % rep


class APIKeyAdmin(admin.ModelAdmin):
    readonly_fields = ('apikey',)

admin.site.register(APIKey, APIKeyAdmin)