I have this relationship which adds a `ContributionType.proposed_abstracts`
backref that contains only abstracts not flagged as deleted.
contrib_type = relationship(
'ContributionType', lazy=True, foreign_keys=contrib_type_id,
backref=backref('proposed_abstracts',
primaryjoin='(Abstract.contrib_type_id == ContributionType.id) &
~Abstract.is_deleted', lazy=True)
)
This works perfectly fine but unfortunately a
`session.delete(some_contribution_type)` now does not NULL out the
contrib_type_id of an abstract that
has been flagged as deleted.
Is there any way to use different join criteria for deletion cascades and
for just accessing the relationship? Or do I need to hook into the
before_delete
event for this?
--
SQLAlchemy -
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http://www.sqlalchemy.org/
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