I start to understand how the mapper works, so I can refine my example
(everything is fictional, just a textbook example)

Let's say I moreover want to manage playlists with in a table as such
as

PLAYLIST_TABLE ( playlist_ident * , track_ident )

now, in fact, I don't need to store any information about the track I
couldn't put in the META_TABLE. So I plan to get rid of the
TRACK_TABLE.
Keeping :

TRACKMETA_TABLE ( track_ident * , field_name * , field_content )

nevertheless I'm still interested in managing TRACKMETA_TABLE
information from a dict-like class.

Playing with sqlalchemy all day, I can't avoid the class pair : Track
and TrackMeta (and associated pair of tables) \o/


Sorry for going round in spirals :)

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