It seems that if you define a mapper relationship through a backref,
that relationship does not appear to be 'visible' when setting options
on a query.
For example:
mapper(Item, item_table, properties = {'reminder': relation(Reminder,
backref='item')})
mapper(Reminder, reminder_table)
If you then try to do the following:
>>> query = session.query(Reminder).options(eagerload('item'))
You get...
AttributeError: 'Reminder' object has no attribute 'item'
So even thought there is a backref, should the mapper for Reminder be:
mapper(Reminder, reminder_table, properties = {'item':relation(Item)}) ?
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