models.py

    _follows = models.ManyToManyField('User', blank=True, related_name='followed_by')

    objects = UserManager()

    REQUIRED_FIELDS = ['email', 'password']

    def unfollow(self, user: User) -> None:
        """ Helper function to remove a user from this users following list. """
        self._follows.remove(user)

    def follow(self, user: User, force: bool = False) -> None:
        """ Helper function to add user to a follower list. """
        self._follows.add(user)

    @property
    def following(self) -> models.QuerySet:
        """ Returns a QuerySet of Users that this user follows. """
        return self._follows.all()

    @property
    def followers(self) -> models.QuerySet:
        """ Returns a QuerySet of Users following this user. """
        return self.followed_by.all()