Quick Rails hack for a Model#increment_attributes method that works like update_attributes

example_usage.rb

Item.create(
  :name => "Lolcat",
  :fans => 0,
  :views => 0
)

item = Item.find_by_name("Lolcat") #=> <Item name:"Lolcat" fans:0 views:0>

item.increment_attributes({ :fans => 4, :views => 3 })

item #=> <Item name:"Lolcat" fans:4 views:3>

item = Item.find_by_name("Lolcat") #=> <Item name:"Lolcat" fans:4 views:3>

item.increment_attributes({ :views => 5 })

item #=> <Item name:"Lolcat" fans:4 views:8>

# ...

increment_attributes.rb

module IncrementAttributes
  
  def increment_attributes(attributes = {}, save = true)
    attributes.each do |key, value|
      if self.respond_to?(key)
        if read_attribute(key).nil? && (!value.is_a?(Fixnum) || !value.is_a?(Float))
          write_attribute(key, value)
        else
          write_attribute(key, read_attribute(key) + value)
        end
      end
    end
    self.save if save
  end
  
end

item.rb

class Item < ActiveRecord::Base
  include IncrementAttributes
end