diff --git a/db/migrate/20160309120350_generate_missed_thumbnails.rb b/db/migrate/20160309120350_generate_missed_thumbnails.rb
new file mode 100644
index 0000000..1beab30
--- /dev/null
+++ b/db/migrate/20160309120350_generate_missed_thumbnails.rb
@@ -0,0 +1,5 @@
+class GenerateMissedThumbnails < ActiveRecord::Migration
+  def up
+    UploadedFile.find_each {|f| f.create_thumbnails if f.thumbnails.empty? }
+  end
+end
--
libgit2 0.21.2