# File lib/active_record/counter_cache.rb, line 69
    def update_counters(id, counters)
      updates = counters.map do |counter_name, value|
        operator = value < 0 ? '-' : '+'
        quoted_column = connection.quote_column_name(counter_name)
        "#{quoted_column} = COALESCE(#{quoted_column}, 0) #{operator} #{value.abs}"
      end

      update_all(updates.join(', '), primary_key => id )
    end