I've generated a test data set and then want to have all of the
created objects and relationships available for reference easily.
To avoid possible pollution of this fixture I want to detach the
objects from the sessions to avoid them getting any updates applied.
To do this I am attempting to load all data via joinedload and then
calling session.expunge_all:
print assets['test_asset_1'].attributes # OK
session.query(Asset).options(joinedload(Asset.asset_attributes)).populate_existing().all()
session.expunge_all()
print assets['test_asset_1'].attributes # ERROR
None of the relationships on the objects survive the expunge.
sqlalchemy.orm.exc.DetachedInstanceError:
Parent instance <Asset at ...> is not bound to a Session;
lazy load operation of attribute 'asset_attributes' cannot proceed
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