speedup dspace:import_items

app/models/learning_object.rb

@@ -9,7 +9,7 @@ class LearningObject < ActiveRecord::Base
   has_many :collection_items, as: :collectionable
   has_many :collections, through: :collection_items
   has_many :complaints
-  has_many :attachments, class_name: 'LearningObject::Attachment', dependent: :destroy
+  has_many :attachments, class_name: 'LearningObject::Attachment', dependent: :destroy, autosave: true # autosave to allow import
 
   belongs_to :publisher, polymorphic: true
   belongs_to :language

app/services/dspace/learning_object_importer.rb

@@ -5,14 +5,24 @@ class Dspace::LearningObjectImporter
   end
 
   def import
+    items = []
+
     @items.each do |item|
       next if item_exists? item
 
-      learning_object = LearningObjectBuilder.build_from_dspace item
-      create_attachments learning_object, item.bit_streams if learning_object.save
+      learning_object = LearningObjectBuilder.build_from_dspace(item)
+
+      next if learning_object.blank?
+
+      create_attachments(learning_object, item.bit_streams)
+
+      items << learning_object
 
       yield(learning_object) if block_given?
     end
+
+    LearningObject.import items, recursive: true
+
   end
 
   private
@@ -20,7 +30,7 @@ class Dspace::LearningObjectImporter
   def create_attachments(learning_object, bitstreams)
     bitstreams = JSON.parse bitstreams if bitstreams.class == String
     bitstreams.each do |bitstream|
-      learning_object.attachments.create ::Dspace::AttachmentMapper.call(bitstream)
+      learning_object.attachments.new ::Dspace::AttachmentMapper.call(bitstream)
     end
   end
 

lib/tasks/dspace.rake

@@ -11,7 +11,7 @@ namespace :dspace do
     logger.level = Log::DatabaseLogger::CREATE
 
     # Quantity of items fetched on each iteration
-    limit = 1000
+    limit = 500
 
     # Start point from where items will be fetched
     offset = 0
@@ -48,7 +48,7 @@ namespace :dspace do
         # Initializes new LearningObjects
         # and saves them on LearningObjects's repository
         importer = Dspace::LearningObjectImporter.new(dspace_items)
-        importer.import { |learning_object| logger.create "Imported: #{learning_object.id_dspace} -> #{learning_object.id}" }
+        importer.import
       end
     end
     logger.close