Use data.absolute_url to get URL to asciicast file

app/services/asciicast_image_generator.rb

@@ -11,7 +11,7 @@ class AsciicastImageGenerator
 
   def generate(asciicast)
     Dir.mktmpdir do |dir|
-      asciicast_url = asciicast.file.absolute_url
+      asciicast_url = asciicast.data.absolute_url
       image_path = "#{dir}/#{asciicast.image_filename}"
       time = asciicast.snapshot_at || asciicast.duration / 2
       theme = AsciicastDecorator.new(asciicast).theme_name

app/uploaders/asciicast_uploader.rb

@@ -1,11 +1,2 @@
 class AsciicastUploader < BaseUploader
-
-  def absolute_url
-    if CFG.carrierwave_storage == 'file'
-      path
-    else
-      url
-    end
-  end
-
 end

app/uploaders/base_uploader.rb

@@ -50,4 +50,12 @@ class BaseUploader < CarrierWave::Uploader::Base
   #   "something.jpg" if original_filename
   # end
 
+  def absolute_url
+    if CFG.carrierwave_storage == 'file'
+      path
+    else
+      url
+    end
+  end
+
 end