def current_state(self):
        if self.history.all():
            return self.history.all()[0]
        else:
            return None
Returns all child categories of the category.
dataset/ETHPy150Open ntoll/workflow/workflow/models.py/WorkflowActivity.current_state--crossover with--dataset/ETHPy150Open diefenbach/django-lfs/lfs/catalog/models.py/Category.get_all_children