refactor Labelable to allow some of its code to be called directly.

lib/rails_admin/config/labelable.rb

@@ -2,18 +2,24 @@ module RailsAdmin
   module Config
     # Defines a generic label/name/title configuration
     module Labelable
+      # Try to find a user-friendly label for an object, falling back
+      # to its class and ID.
+      def self.object_label(object)
+        if object.respond_to?(:name) && object.name
+          object.name
+        elsif object.respond_to?(:title) && object.title
+          object.title
+        else
+          "#{object.class.to_s} ##{object.try(:id)}"
+        end
+      end
+
       def self.included(klass)
         klass.register_instance_option(:label) do
           abstract_model.model.model_name.human(:default => abstract_model.model.model_name.titleize)
         end
         klass.register_instance_option(:object_label) do
-          if bindings[:object].respond_to?(:name) && bindings[:object].name
-            bindings[:object].name
-          elsif bindings[:object].respond_to?(:title) && bindings[:object].title
-            bindings[:object].title
-          else
-            "#{bindings[:object].class.to_s} ##{bindings[:object].id}"
-          end
+          RailsAdmin::Config::Labelable.object_label bindings[:object]
         end
       end
     end