I tried this code:
@listens_for(AttachmentFolder.all_attachments, 'append')
def _attachment_added(target, value, *unused):
target.modified_dt = now_utc()
However AttachmentFolder.all_attachments is a backref so it doesn't exist
at import time (I usually
register listeners right after the definition of the model class). So I
tried using the mapper_configured
event, but backrefs still don't exist at that point.
Besides flipping the relationship/backref around (which would work only
because I don't have
any listeners on the relationship itself yet), is there any clean way to
bind an event listener
to a backref?
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