Manager isn't accessible via model instances

Question

I\'m trying to get model objects instance in another one and I raise this error :

 Manager isn\'t accessible via topic instance

Here\'s my

Answer 1

For django < 1.10

topic._default_manager.get(id=topic_id)

Though you should not use it like this. The _default_manager and _base_manager are private, so it's recomended to use them only if you're inside the Topic model, like when you want to use the Manager in a proprietary function let's say:

class Topic(Model):
.
.
.
    def related(self)
        "Returns the topics with similar starting names"
        return self._default_manager.filter(name__startswith=self.name)

topic.related() #topic 'Milan wins' is related to:
# ['Milan wins','Milan wins championship', 'Milan wins by one goal', ...]