def collection_attribute(attr, tms_class)
      @collection_attributes ||= []
      @collection_attributes.push(attr).uniq!
      setup_collection(attr, GovDelivery::TMS.const_get(tms_class))
    end
def collection_attribute(attr, tms_class)
      @collection_attributes ||= []
      @collection_attributes.push(attr).uniq!
      setup_collection(attr, GovDelivery::TMS.const_get(tms_class))
    end
For collections that are represented as attributes (i.e. inline, no href)
 and that have a class name other than the one we would infer.

 @example
    collection_attributes :recipients, 'EmailRecipient'