app/representers/api/preview_representer.rb
class API::PreviewRepresenter < API::RepresenterBase
property :content_type
property :width
property :height
property :thumbnail, as: :'thumbnail_size'
property :size
link "madek:media_entry" do
api_media_entry_path(@represented.media_file.media_entry_id)
end
link 'madek:content_stream' do api_preview_content_stream_path(@represented) end
end