snippet.diff

+++ my-dm-validations.rb
--- dm-validations.rb
@@ -87,7 +87,6 @@
     # Check if a resource is valid in a given context
     #
     def valid?(context = :default)
+      return true if respond_to?(:model) && !self.new? && !self.dirty?
       klass = respond_to?(:model) ? model : self.class
       klass.validators.execute(context, self)
     end