[NiLuJe]

@melovesflying: Err, why use a CS column type? Why not a simple tristate one (i.e., Yes/No/??).

I vaguely remember that those are stored as an int, maybe, so just check create & match on True or 1 and voilà? [EDIT: Plus a bit of regex name switch to avoid the collection being named "1" or "True" or whatever is the actual underlying data type].

It's very late/early here, so take that w/ a grain of salt...
On the plus side, I do use a column like that in my own setup, even if I never based collections on it (I think?), so I might be able to check how much sense I'm making...

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Barring that, you're missing a "match on" for the actual value stored in your column when a book is actually read to do anything useful. (Maybe? Brain is mush here).