On Dec 9, 2009, at 12:41 , Antonio Beamud Montero wrote:

>        s.intersect(select([tags.c.channel], tags.c.tag == tag))

This is returning a new select which is the intersection --- which you are 
throwing away. It is *not* modifying s in-place.

You probably want to do

    s = s.intersect(select([tags.c.channel], tags.c.tag == tag))

--
Alex Brasetvik

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