custom_counter_sql

# File activerecord/lib/active_record/associations/collection_association.rb, line 349
        def custom_counter_sql
          if options[:counter_sql]
            interpolate(options[:counter_sql])
          else
            # replace the SELECT clause with COUNT(*), preserving any hints within /* ... */
            interpolate(options[:finder_sql]).sub(/SELECT\b(\/\*.*?\*\/ )?(.*)\bFROM\b/m) { "SELECT #{$1}COUNT(*) FROM" }
          end
        end