Rails - Dec 2005 - Pre-selecting options_from_collection_for_select Options

I''m trying to use options_from_collection_for_select to generate
options
for a multiple select:

<select id="metro_area_states" name="states[]"
size="10"
multiple="multiple">
  <%= options_from_collection_for_select State.find(:all), :id, :name, 
@metro_area.states %>
</select>

When selecting values for the first time, it works great. I use 
@metro_area.state_ids= in the controller to set the selected states, and 
it saves just fine.

When editing, it should pre-select the states using @metro_area.states, 
but it doesn''t. The docs for options_from_collection_for_select say it 
uses the value parameter, :id in my case, to match against the 
collection. I know @metro_area.states contains State objects. I can 
output them just fine manually, but options_from_collection_for_select 
doesn''t like them.

Should I just do this manually myself, or is there a way to make this 
work?

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