Merge branch 'feature-edit-lo' of gitlab.c3sl.ufpr.br:portalmec/portalmec into feature-edit-lo

app/models/learning_object/attachment.rb

 class LearningObject::Attachment < ActiveRecord::Base
   belongs_to :learning_object
+
+  has_attached_file :thumbnail, styles: {medium: "530x300", small: "250x140"}
+  validates_attachment_content_type :thumbnail, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]
 end

app/workers/dspace_upload_worker.rb

@@ -12,10 +12,10 @@ class DspaceUploadWorker
 
     #find learning object
     learning_object = LearningObject.find learning_object_id
-    learning_object.attachments.create map_bitstream2attachment(bitstream)
+    attachment = learning_object.attachments.create map_bitstream2attachment(bitstream)
     publisher.publish! learning_object
 
-    ThumbnailGenerateWorker.perform_async media_path, learning_object_id
+    ThumbnailGenerateWorker.perform_async media_path, attachment.id
   end
 
   private

app/workers/thumbnail_generate_worker.rb

@@ -4,9 +4,11 @@ require 'screencap'
 class ThumbnailGenerateWorker
   include Sidekiq::Worker
 
-  def perform(media_path, object_id)
+  def perform(media_path, attachment_id)
     media = create_media media_path
-    thumbnail_service.create_thumbnail media
+    attachment = ::LearningObject::Attachment.find(attachment_id)
+    attachment.thumbnail = thumbnail_service.create_thumbnail media
+    attachment.save!
   end
 
   private

db/migrate/20160301103501_add_paperclip_to_attachments.rb

+class AddPaperclipToAttachments < ActiveRecord::Migration
+  def up
+    add_attachment :learning_objects, :thumbnail
+  end
+
+  def down
+    remove_attachment :learning_objects, :thumbnail
+  end
+end