content_table = Table('content', metadata,
	Column('id', Integer, primary_key=True),
	Column('locale', String, nullable=False),
	Column('countryId', Integer),
	Column('cat', String),
	useexisting=True
)
class Content(object):
	def __init__(self, id=None, locale=None, countryId=None, cat=None, tag=None):
		self.id = id
		self.locale = locale
		self.countryId = countryId
		self.cat = cat
		self.tag = tag
	def __repr__(self):
		return "Content Id %i" % self.id

mapper(Content, content_table)

cat_table = Table('cat', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String(128), nullable=False),
	Column('tag', String(128), nullable=False),
	Column('ranking', Integer(2)),
	useexisting=True
)
cat_locale_table = Table('cat_locale', metadata,
	Column('id', Integer, ForeignKey('cat.id'), primary_key=True),
	Column('contentId', None, ForeignKey('content.id')),
	useexisting=True
)

class Cat(object):
	def __init__(self, id=None, name=None, tag=None, ranking=None):
		self.id = id
		self.name = name
		self.tag = tag
		self.ranking = ranking


mapper(Cat, cat_table, properties={
	"contents": relation(Content, lazy=False, secondary=cat_locale_table)
})


#### This line throws the following error:

sa.query(Cat).order_by(Cat.name).options([eagerload('contents')]).all()


InvalidRequestError: Mapper 'Mapper|Cat|cat' has no property 'contents'