Forcing group_by on a field other than id

I'm trying to do a query that needs a group_by on a field other than id.

I've tried this:

s=Song.objects.using('bmillham').annotate(Count('played__date_played')).order_by('-played__date_played')

the generated query is:

>>> print s.query
SELECT `song`.`id`, `song`.`file`, `song`.`catalog`, `song`.`album`,
`song`.`album`, `song`.`year`, `song`.`artist`, `song`.`artist`,
`song`.`title`, `song`.`bitrate`, `song`.`rate`, `song`.`mode`,
`song`.`size`, `song`.`time`, `song`.`track`, `song`.`update_time`,
`song`.`addition_time`, COUNT(`played`.`date_played`) AS
`played__date_played__count` FROM `song` LEFT OUTER JOIN `played` ON
(`song`.`id` = `played`.`track_id`) GROUP BY `song`.`id` ORDER BY
`played`.`date_played` DESC

I tried adding

s.query.group_by = [('played', 'date_played')]

but that doesn't change the query.

Am I missing something here, or can't this be done?

Thanks!
Brian

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