# File lib/moneta/adapters/activerecord.rb, line 125
      def increment(key, amount = 1, options = {})
        @table.connection_pool.with_connection do
          @table.transaction do
            if record = @table.where(:k => key).lock.first
              value = Utils.to_int(record.v) + amount
              record.v = value.to_s
              record.save
              value
            elsif create(key, amount.to_s, options)
              amount
            else
              raise 'Concurrent modification'
            end
          end
        end
      rescue
        tries ||= 0
        (tries += 1) < 10 ? retry : raise
      end