Get RemoteAccount object for user.

        :param user_id: User id
        :param client_id: Client id.
        :returns: A :class:`invenio_oauthclient.models.RemoteAccount` instance.

def get(cls, user_id, client_id):
        """Get RemoteAccount object for user.

        :param user_id: User id
        :param client_id: Client id.
        :returns: A :class:`invenio_oauthclient.models.RemoteAccount` instance.
        """
        return cls.query.filter_by(
            user_id=user_id,
            client_id=client_id,
        ).first()