How to filter data from model?

I have two models:

class ModelOne(models.Model):
    something = models.TextField[...]

class ModelTwo(models.Model):
    other_something = models.TextField[...]
    ref = models.ForeignKey(ModelOne)

And I want to write function in ModelOne which return me all related objects from M开发者_开发问答odelTwo.

It's important: In ModelOne.

How to do it?

---

Invoke self.modeltwo_set.all().