move logic of learning object view to helper

app/helpers/learning_objects_helper.rb

@@ -4,4 +4,15 @@ module LearningObjectsHelper
     categories.to_s
   end
 
+  def render_learning_object(orientation, learning_object)
+    case (orientation)
+      when "vertical"
+        render "learning_objects/learning_object_vertical", learning_object: learning_object
+      when "horizontal"
+        render "learning_objects/learning_object_horizontal", learning_object: learning_object
+      else
+        render "learning_objects/learning_object_horizontal", learning_object: learning_object
+    end
+  end
+
 end

app/models/learning_object.rb

 class LearningObject
   include ActiveModel::Model
   attr_accessor :id, :id_dspace, :rid, :name, :description,
-                :thumbnail, :date_creation, :last_modified,
+                :thumbnail, :created_at, :last_modified,
                 :type, :bitstreams, :metadata, :likes, :views, :downloads
 
-  validates_presence_of :name, :date_creation, :type, :likes, :views, :downloads
+  validates_presence_of :name, :created_at, :type, :likes, :views, :downloads
   validates_numericality_of :likes, greater_than_or_equal_to: 0
   validates_numericality_of :views, greater_than_or_equal_to: 0
   validates_numericality_of :downloads, greater_than_or_equal_to: 0

app/views/learning_objects/_learning_object.erb

-<%=
-  case(orientation)
-  when "vertical"
-    render "learning_objects/learning_object_vertical", learning_object: learning_object
-  when "horizontal"
-    render "learning_objects/learning_object_horizontal", learning_object: learning_object
-  else
-    render "learning_objects/learning_object_horizontal", learning_object: learning_object
-  end
-%>
+<%= render_learning_object orientation, learning_object %>