Struggling with aggregation/annotation

Hi,

currently I am moving my django project towards Django 1.2. During
that step I want to replace code like that

query_set = query_set.extra(select = {
'image_count': '''SELECT COUNT(*) FROM image
WHERE topic.id =
image.topic_id
AND topic.trashed_at =
image.trashed_at''',
'video_count': '''SELECT COUNT(*) FROM video
WHERE topic.id =
video.topic_id
AND topic.trashed_at =
video.trashed_at''',
})

Selecting a topic instance or a list of topic instances I also want to
know the amount of images associated with the topic, which share the
same value for trashed_at.

Can this be written using the annotate method and the Count class?

Best regards,
Oliver

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