def get_related_field(self):
        return self.to._meta.pk
Iterator over pairs of elements from the given iterable.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/db/models/fields/related.py/ManyToManyRel.get_related_field--crossover with--dataset/ETHPy150Open cloudmatrix/esky/esky/util.py/pairwise