validate_collection_association

# File activerecord/lib/active_record/autosave_association.rb, line 313
      def validate_collection_association(reflection)
        if association = association_instance_get(reflection.name)
          if records = associated_records_to_validate_or_save(association, new_record?, reflection.options[:autosave])
            records.each_with_index { |record, index| association_valid?(reflection, record, index) }
          end
        end
      end