Refactor: extract methods to a module and class helper, dollarized_attribute

lib/dollarized_attribute.rb

@@ -0,0 +1,23 @@
+# Shared module to allow seting an attribute using:
+# * Dollar amount - $1,000.00
+# * Number - 100.00
+module DollarizedAttribute
+  module ClassMethods
+    
+    # dollarized_attribute(:budget) will create a budget=(value) method
+    def dollarized_attribute(attribute)
+      define_method(attribute.to_s + '=') {|value|
+        if value.is_a? String
+          write_attribute(attribute, value.gsub(/[$ ,]/, ''))
+        else
+          write_attribute(attribute, value)
+        end
+      }
+    end
+    
+  end
+
+  def self.included(base)
+    base.extend ClassMethods
+  end
+end