learning_object_builder.rb

class LearningObjectBuilder < Builder
  extend RepositoriesProxy

  ##
  # receive a list of ids and return a list of learning objects
  # useful for search pagination
  #
  def self.build(objects = [])
    lo = []
    objects = [objects] if objects.class == String || objects.class == Hash
    objects.each do |object|
      unless object['rid'].blank?
        o = Rails.cache.fetch(cache_key(object['rid'], object['last_modified'])) unless object['last_modified'].blank?
        o = learning_object_repository.find object['rid'] if o.nil?
        lo << o
      end
    end
    lo
  end

  def self.build_from_orientdb(args = {})
    lo = nil

    unless args.nil?
      # cache object when build
      lo = Rails.cache.fetch(cache_key(args['@rid'], args['last_modified']), expires_in: 12.hours) do
        args['metadata'] = JSON.parse(args['metadata']) if args['metadata'].class == String
        obj = LearningObject.new(

            id: args['@rid'],
            name: args['name'],
            description: args['description'],
            thumbnail: (args['thumbnail'] or ''),
            id_dspace: args['id_dspace'],
            type: args['type'],
            attachment: LearningObject::Attachment.new(args['bitstreams']),
            last_modified: args['last_modified'],
            metadata: args['metadata']
        )
        obj.created_at = DateTime.strptime(args['created_at'], "%Y-%m-%d %H:%M:%S") unless args['created_at'].blank?
        obj.last_modified = DateTime.strptime(args['last_modified'], "%Y-%m-%d %H:%M:%S") unless args['last_modified'].blank?
        obj.published_at = DateTime.strptime(args['published_at'], "%Y-%m-%d %H:%M:%S") unless args['published_at'].blank?
        obj
      end
    end

    lo
  end

end