Django's get_or_create method returning non-existent data

Question

I have a model called Service where I have an object named Service1. I got the following at the shell:

$ obj, created = Service.objects.get_or_create(name=u'Service1')
$ obj
  <Service: Service1>
$ obj.id
  3
$ created
  False
$ Service.objects.all()
  [<Service: Service1>]
$ Service.objects.first().id
  1

I checked the database and there is only one Service object which is the Service with id=1. Why is get_or_create retrieving an object that doesn't even exist?

Answer 1

The problem was caching. I was using a new dump of the database, but I forgot invalidating the cache. Django was retrieving an object that does't exist anymore but would be found on the older database .