Flask-Tryton: login

User = tryton.pool.get('res.user')
class LoginUser(UserMixin):
    def __init__(self, id): self.id = id

    @classmethod
    @tryton.transaction()
    def get(cls, userid):
        users = User.search([('id', '=', int(userid))], limit=1)
        if users: return cls(users[0].id)

    @classmethod
    @tryton.transaction()
    def authenticate(cls, username, password):
        userid = User.get_login(username, password)
        if userid: return cls(userid)

    @staticmethod
    @login_manager.user_loader
    def load_user(userid):
        return LoginUser.get(userid)