How to use the ihatemoney.models.Project function in ihatemoney

# Use Basic Auth
        if auth and project_id and auth.username == project_id:
            project = Project.query.get(auth.username)
            if project and check_password_hash(project.password, auth.password):
                # The whole project object will be passed instead of project_id
                kwargs.pop("project_id")
                return f(*args, project=project, **kwargs)
        else:
            # Use Bearer token Auth
            auth_header = request.headers.get("Authorization", "")
            auth_token = ""
            try:
                auth_token = auth_header.split(" ")[1]
            except IndexError:
                abort(401)
            project_id = Project.verify_token(auth_token, token_type="non_timed_token")
            if auth_token and project_id:
                project = Project.query.get(project_id)
                if project:
                    kwargs.pop("project_id")
                    return f(*args, project=project, **kwargs)
        abort(401)

def demo():
    """
    Authenticate the user for the demonstration project and redirect him to
    the bills list for this project.

    Create a demo project if it doesn't exists yet (or has been deleted)
    If the demo project is deactivated, one is redirected to the create project form
    """
    is_demo_project_activated = current_app.config["ACTIVATE_DEMO_PROJECT"]
    project = Project.query.get("demo")

    if not project and not is_demo_project_activated:
        raise Redirect303(url_for(".create_project", project_id="demo"))
    if not project and is_demo_project_activated:
        project = Project(
            id="demo",
            name="demonstration",
            password=generate_password_hash("demo"),
            contact_email="demo@notmyidea.org",
        )
        db.session.add(project)
        db.session.commit()
    session[project.id] = True
    return redirect(url_for(".list_bills", project_id=project.id))

def get(self, project, id):
            try:
                return (
                    self.join(Person, Project)
                    .filter(Bill.payer_id == Person.id)
                    .filter(Person.project_id == Project.id)
                    .filter(Project.id == project.id)
                    .filter(Bill.id == id)
                    .one()
                )
            except orm.exc.NoResultFound:
                return None

def validate_id(form, field):
        if not Project.query.get(field.data):
            raise ValidationError(_("This project does not exists"))

def save(self):
        """Create a new project with the information given by this form.

        Returns the created instance
        """
        project = Project(
            name=self.name.data,
            id=self.id.data,
            password=generate_password_hash(self.password.data),
            contact_email=self.contact_email.data,
        )
        return project

def get_member_bills(self, member_id):
        """Return the list of bills related to a specific member"""
        return (
            Bill.query.join(Person, Project)
            .filter(Bill.payer_id == Person.id)
            .filter(Person.project_id == Project.id)
            .filter(Person.id == member_id)
            .filter(Project.id == self.id)
            .order_by(Bill.date.desc())
            .order_by(Bill.id.desc())
        )