lib/vedeu/null/interface.rb in vedeu-0.4.45 vs lib/vedeu/null/interface.rb in vedeu-0.4.46

@@ -1,14 +1,18 @@
+require 'vedeu/output/presentation'
+
 module Vedeu
 
   module Null
 
     # Provides a non-existent model to swallow messages.
     #
     # @api private
     class Interface
 
+      include Vedeu::Presentation
+
       # Returns a new instance of Vedeu::Null::Interface.
       #
       # @param name [String]
       # @return [Vedeu::Null::Interface]
       def initialize(name = nil)
@@ -18,9 +22,16 @@
       # @return [Hash<Symbol => String>]
       def attributes
         {
           name: name,
         }
+      end
+
+      # The null interface should not have a parent.
+      #
+      # @return [NilClass]
+      def parent
+        nil
       end
 
       # Pretend to store this model in the repository.
       #
       # @return [Vedeu::Null::Interface]