ActiveModel::Dirty is now included in Cramp::Model::Base. When settin…

…gs attributes, they are only changed if their are different from the existing ones.

lib/cramp/model/attribute_methods.rb

@@ -42,7 +42,10 @@ def write_attribute(name, value)
         if ma = self.class.model_attributes[name.to_sym]
           value = ma.check_value!(value)
         end
-        @attributes[name] = value
+        if(@attributes[name] != value)
+          send "#{name}_will_change!".to_sym
+          @attributes[name] = value
+        end
       end
 
       def read_attribute(name)

lib/cramp/model/base.rb

@@ -5,6 +5,7 @@ class Base
       extend Finders
       include AttributeMethods
       include ActiveModel::Validations
+      include ActiveModel::Dirty
       include Callbacks
 
       class << self
@@ -82,6 +83,11 @@ def update_record(callback = nil, &block)
       end
 
       def after_save(status)
+        if status.success?
+          previously_changed_attributes = changes
+          changed_attributes.clear
+        end
+
         after_save_callbacks status
       end