':return: Return Sessions object with the current user as a speaker by ID'

@staticmethod
def get_sessions_of_user_by_id(session_id, user=login.current_user):

    try:
        return Session.query.filter(Session.speakers.any((Speaker.user_id == user.id))).filter((Session.id == session_id)).filter(Session.deleted_at.is_(None)).one()
    except MultipleResultsFound:
        return None
    except NoResultFound:
        return None
