custom_counter_sql

# File activerecord/lib/active_record/associations/collection_association.rb, line 360
        def custom_counter_sql
          if options[:counter_sql]
            interpolate(options[:counter_sql])
          else
            # replace the SELECT clause with COUNT(SELECTS), preserving any hints within /* ... */
            interpolate(options[:finder_sql]).sub(/SELECT\b(\/\*.*?\*\/ )?(.*)\bFROM\b/m) do
              count_with = $2.to_s
              count_with = '*' if count_with.blank? || count_with =~ /,/ || count_with =~ /\.\*/
              "SELECT #{$1}COUNT(#{count_with}) FROM"
            end
          end
        end