lib/mattock/configurable/field-processor.rb in mattock-0.5.3 vs lib/mattock/configurable/field-processor.rb in mattock-0.7.0

@@ -6,39 +6,39 @@
         @field_names = filter(source.class.field_names)
       end
       attr_accessor :field_names
       attr_reader :source
 
-      def filter_attribute
-        raise NotImplementedError
-      end
-
       def filter(field_names)
         field_names.find_all do |name|
           source.class.field_metadata(name).is?(filter_attribute)
         end
       end
 
-      def value(field)
-        source.__send__(field.reader_method)
+      def can_process(field, target)
+        target.respond_to?(field.writer_method)
       end
 
       def to(target)
         field_names.each do |name|
           field = source.class.field_metadata(name)
-          next unless target.respond_to?(field.writer_method)
+          next unless can_process(field, target)
           target.__send__(field.writer_method, value(field))
         end
       end
     end
 
     class SettingsCopier < FieldProcessor
       def filter_attribute
         :copiable
       end
 
+      def can_process(field, target)
+        super and not( field.unset_on?(source) and field.unset_on?(target) )
+      end
+
       def value(field)
-        field.immediate_value_on(source)
+        return field.copy_from(source)
       end
     end
 
     class SettingsProxier < FieldProcessor
       def filter_attribute