sort_query cannot order by descending hybrid property

[jpvanhal]

>>> import sqlalchemy as sa
>>> from sqlalchemy import create_engine
>>> from sqlalchemy.orm import sessionmaker
>>> from sqlalchemy.ext.declarative import declarative_base
>>> from sqlalchemy.ext.hybrid import hybrid_property
>>> from sqlalchemy_utils import sort_query
>>>
>>> engine = create_engine('sqlite:///')
>>> Base = declarative_base()
>>> Session = sessionmaker(bind=engine)
>>> session = Session()
>>>
>>> class User(Base):
...    __tablename__ = 'user'
...    id = sa.Column(sa.Integer, primary_key=True)
...    first_name = sa.Column(sa.Unicode(255))
...    last_name = sa.Column(sa.Unicode(255))
...
...    @hybrid_property
...    def full_name(self):
...        return self.first_name + ' ' + self.last_name
...
>>> query = sort_query(session.query(User), '-full_name')
>>> print query
SELECT "user".id AS user_id, "user".first_name AS user_first_name, "user".last_name AS user_last_name
FROM "user" ORDER BY "user".first_name || :first_name_1 || "user".last_name

Note that the query above is missing the DESC keyword.

SQLAlchemy's query syntax works fine:

>>> print session.query(User).order_by(sa.desc(User.full_name))
SELECT "user".id AS user_id, "user".first_name AS user_first_name, "user".last_name AS user_last_name
FROM "user" ORDER BY ("user".first_name || :first_name_1 || "user".last_name) DESC