adding link to sanitize args

Signed-off-by: man13 <man13@inf.ufpr.br>

app/builders/learning_object/draft_builder.rb

@@ -20,10 +20,11 @@ class LearningObject::DraftBuilder < ::Builder
 
   def self.sanitize_params(args={})
     _args = args.clone
-    %w(topics language).each do |arg|
+    %w(topics language link).each do |arg|
       _args.delete(arg)
     end
-    _args
+    metadata = [{'key' => 'dc.object.url', 'value' => args[:link]}]
+    _args.merge(metadata: metadata)
   end
 
 end