active_record has_many, :through and active _resource

Hello,
I have many to many relationship between Venue and Catalog
<pre>
class Venue < ActiveRecord::Base
  has_many :venue_catalogs
  has_many :catalogs, :through => :venue_catalogs
end

class VenueCatalog < ActiveRecord::Base
  belongs_to :venue
  belongs_to :catalog
end

class Catalog < ActiveResource
end
</pre>
when I call url /venues.xml I get
undefined method `quoted_table_name' for Catalog:Class

seems belongs_to ActiveResource is not recognizing catalog is not an
ActiveRecord.