In short, I want to do a proper relation definition for that
@property
def artist(self):
on_act_val = activity.c.name == 'artist'
on_track = participant_activity.c.product_id == self.id
on_act_join = participant_activity.c.activity_id == activity.c.id
on_part_join = participant_activity.c.participant_id == participant.c.id
return participants.selectone(on_track & on_act_join & on_part_join &
on_act_val)
any idea?
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