Rails - Nov 2008 - Make a STI-compatible finder for a polymorphic column ?

Hi,

I''ve got a model with a polymorphic column and STI models.
I''ve added a finder to search for specific types.
How can I search for a specific model that is STI because Rails stores
the mother class name ?

class Activity < ActiveRecord::Base
  belongs_to :item, :polymorphic => true

  named_scope :filter_items, lambda { |i| { :conditions => { :item_type
=> i } } }
end

class Person < ActiveRecord::Base
end

class Site < ActiveRecord::Base
end

class Event < Site
end

class Place < Site
end

Activity.filter_items(''Person'') works but
Activity.filter_items(''Event'')
and Activity.filter_items(''Place'') don''t work because
Rails stores
''Site'' in item_type column...

I would like to be able to search through STI and non-STI models...

Thanks for your answers,
Nicolas.
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