my_friends = db((db.friendship.accepted == True) & 
((db.friendship.source_user == auth.user_id) | (db.friendship.target_user 
== auth.user_id))).select()

my_friends_ids = [friendship.source_user if friendship.source_user != 
auth.user_id else friendship.target_user for friendship in my_friends]


I would cache this denormalized result, probably in the user table.

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