beezwax / acts-as-price-tag

This plugin adds a price methods (with currency support) to any active record object. It acts as a wrapper around Tobias Luetke's money gem.

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acts-as-price-tag / README
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== Usage
 
This plugin adds price accessor and assignment methods to any active record object. 
It expects cents:integer and currency:string fields in the database.
The money functionality is drawn from ruby's money gem.
the price= method will accept a Money object or any object with a to_money method implemented.
 
#   class Product < ActiveRecord::Base
#     has_many :product_units
#     acts_as_price_tag
#   end
# 
#    product = Product.new
#    product.price = "EUR1000"
# => "EUR1000"
#    product.price
# => #<Money:0x235607c @currency="EUR", @cents=100000>
#    product.price = Money.new(55500, "USD")
# => #<Money:0x232ca9c @currency="USD", @cents=55500>
 
Money gem readme/license included in lib.