Add support for Mongoid versions >= 3.0.0

lib/money-rails/hooks.rb

@@ -15,7 +15,7 @@ def self.init
         end
 
         if ::Mongoid::VERSION =~ /^3(.*)/
-          # Mongoid 3.x stuff here
+          require 'money-rails/mongoid/three'
         end
       end
 

lib/money-rails/mongoid/three.rb

@@ -0,0 +1,40 @@
+class Money
+
+  # Converts an object of this instance into a database friendly value.
+  def mongoize
+    {
+      :cents        => cents,
+      :currency_iso => currency.iso_code
+    }
+  end
+
+  class << self
+
+    # Get the object as it was stored in the database, and instantiate
+    # this custom class from it.
+    def demongoize(object)
+      return nil if object.nil?
+
+      ::Money.new(object[:cents], object[:currency_iso])
+    end
+
+    # Takes any possible object and converts it to how it would be
+    # stored in the database.
+    def mongoize(object)
+      case object
+      when Money then object.mongoize
+      when Hash then ::Money.new(object[:cents], object[:currency]).mongoize
+      else object
+      end
+    end
+
+    # Converts the object that was supplied to a criteria and converts it
+    # into a database friendly form.
+    def evolve(object)
+      case object
+      when Money then object.mongoize
+      else object
+      end
+    end
+  end
+end