Got it. Looked through the source and found the very helpful
joins_for_collection just waiting to be over-ridden.
Here is the working controller code:
#(report belongs to user belongs to region)
def joins_for_collection
[:user => :region] # not sure if [{:user => :region}] is better
end
def conditions_for_collection
if current_user.region
@region_list = current_user.region.self_and_descendants.collect {|
x| x.name}
[ "regions.name IN (?)", @region_list]
end
end
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