I have an issue with connect_via

gistfile1.txt

@cust_bp.route('/api/v1/customers/facebook', methods = ['POST'])
def facebook_login():
    if not facebook.authorized:
        return redirect(url_for('facebook.login'))

    account_info = facebook.get('account/settings.json')
    account_info_json = account_info.json()

    return '<h1>Your facebook name is @{}'.format(account_info_json['screen_name'])


@oauth_authorized.connect_via(facebook_blueprint)
def facebook_logged_in(blueprint, token):

    account_info = blueprint.session.get('account/settings.json')

    if account_info.ok:
        account_info_json = account_info.json()
        username = account_info_json['screen_name']

        query = Customers.query.filter_by(username=name)

        try:
            user = query.one()
        except NoResultFound:
            user = User(username=username)
            db.session.add(user)
            db.session.commit()

        login_user(user)