learning_object_serializer.rb

class LearningObjectSerializer < ActiveModel::Serializer
  def default_location
    object.default_attachment.try(:retrieve_url)
  end

  def default_mime_type
    object.default_attachment.try(:mime_type)
  end

  def default_attachment_id
    object.default_attachment.try(:id)
  end

  def thumbnail
    object.default_thumbnail
  end

  def object_type
    object.object_type.try(:name)
  end

  def liked?
    object.liked? current_user
  end

  attributes :id,
             :name,
             :description,
             :author,
             :thumbnail,
             :publisher,
             :object_type,
             :language,
             :default_attachment_id,
             :default_location,
             :default_mime_type,
             :score,
             :state,
             :review_ratings_average,
             :license,
             :liked?,
             :likes_count,
             :shares_count,
             :created_at,
             :updated_at

  has_many :tags
  has_many :subjects
  has_many :educational_stages
  has_many :attachments
end