update_counters

# File activerecord/lib/active_record/relation.rb, line 471
    def update_counters(counters) # :nodoc:
      touch = counters.delete(:touch)

      updates = {}
      counters.each do |counter_name, value|
        attr = arel_attribute(counter_name)
        updates[attr.name] = _increment_attribute(attr, value)
      end

      if touch
        names = touch if touch != true
        touch_updates = klass.touch_attributes_with_time(*names)
        updates.merge!(touch_updates) unless touch_updates.empty?
      end

      update_all updates
    end