fix learning object builder

app/builders/learning_object_builder.rb

@@ -10,8 +10,8 @@ class LearningObjectBuilder
 
     lo.author = lo.get_metadata_values_of('dc.contributor.author').join(', ')
     lo.description = lo.get_metadata_value_of('dc.description')
-    lo.object_type = lo.get_metadata_value_of('dc.type')
-    lo.language = Language.first_or_create(code: lo.get_metadata_value_of('dc.language'))
+    lo.object_type = ObjectType.where(name: lo.get_metadata_value_of('dc.type')).first_or_create
+    lo.language = Language.where(code: lo.get_metadata_value_of('dc.language')).first_or_create
     date = lo.get_metadata_value_of('dc.date.issued')
     lo.published_at = Time.iso8601(date) unless date.nil?
     lo