Although the official documentation is very robust and detailed, one thing
I noticed is not very clear.
When specifying arguments for a relationship like this:
class Bonus(Base):
....
basis = relationship("Accomplishment", uselist=False, lazy='joined')
whenever there is "uselist=False", the eager-loading doesn't happen,
regardless of setting the lazy='joined' or not.
If I load the Bonus object and expunge it from the session, and then try to
access the 'basis' attribute, I will get a
'sqlalchemy.orm.exc.DetachedInstanceError'.
Is uselist=False naturally incompatible with eager-loading? If so, what is
the underlying reasong? Thanks.
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http://www.sqlalchemy.org/
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