Datamapper DataMapper

Currently, a property defined like:

property :crypted_password, String,  :nullable => false, :accessor => :private

will cause a save to fail, since the value can't be accessed by the auto-created validates_present.

The offending code in dm-validations/lib/dm-validations.rb:

    def validation_property_value(name)
      return self.instance_variable_get("@#{name}") if self.instance_variables.include?(name)
      return self.send(name) if self.respond_to?(name)
      nil
    end

A trivial commit -- http://github.com/daveyeu/dm-mor... -- fixes this by using "respond_to?(name, true)" instead.