Hi list,
Here is my solution (thanks to jek from IRC).
# Mappers
channel_mapper = mapper(Channel, channel_table,
properties = {
"playlists":relation(PlaylistChannel,
backref="channel",
primaryjoin=and_(channel_table.c.id==
playlist_channel_table.c.id_channel)),
"active":relation(Playlist, post_update=True,
primaryjoin=and_(channel_table.c.id_playlist==
playlist_table.c.id))
},
order_by=channel_table.c.name,
)
That is one solution I was actually doing, but it turns out that I
didn't know about the "post_update" argument... and this is not
documented anywhere in the docs !
This solution without the argument post_update=True turns out to yield a
"CircularDependencyError":
sqlalchemy.exceptions.CircularDependencyError: Circular dependency
detected [(<PlaylistChannel: 2>, <Channel: Test TV>), (<Channel: Test
TV>, <PlaylistChannel: 1>), (<Channel: Test TV>, <PlaylistChannel: 2>)][]
ps: Ok, this is documented, but we need to look down in the generated
API documentation of the relation() function. I think this should be
pushed up somewhere in the docs. Here's a suggestion:
http://www.sqlalchemy.org/docs/04/mappers.html#advdatamapping_relation_customjoin
Regards,
--
Alexandre CONRAD
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