instance method destroy_row

# File activerecord/lib/active_record/counter_cache.rb, line 235
      def destroy_row
        affected_rows = super

        if affected_rows > 0
          counter_cached_association_names.each do |association_name|
            association = association(association_name)

            unless destroyed_by_association && _foreign_keys_equal?(destroyed_by_association.foreign_key, association.reflection.foreign_key)
              association.decrement_counters
            end
          end
        end

        affected_rows
      end