def befriend(self, user1, user2):
        friendship = Friendship.objects.get(user=user1)
        friendship.friends.add(Friendship.objects.get(user=user2))
        # Now that user1 accepted user2's friend request we should delete any
        # request by user1 to user2 so that we don't have ambiguous data
        FriendshipRequest.objects.filter(from_user=user1,
                                         to_user=user2).delete()
Establish friendship between ``user1`` and ``user2``.
dataset/ETHPy150Open muhuk/django-simple-friends/friends/models.py/FriendshipManager.befriend