BUGFIX: actually clean up all avatar thumbnails

lib/tasks/avatars.rake

@@ -16,8 +16,11 @@ task "avatars:clean" => :environment do
   i = 0
   puts "Cleaning up avatar thumbnails"
   puts
-  custom_upload_ids = UserAvatar.where.not(custom_upload_id: nil).pluck(:custom_upload_id)
-  OptimizedImage.where("upload_id IN (?)", custom_upload_ids).find_each do |optimized_image|
+
+  OptimizedImage.where("upload_id IN (SELECT custom_upload_id FROM user_avatars")
+                .where("upload_id IN (SELECT gravatar_upload_id FROM user_avatars")
+                .where("upload_id IN (SELECT uploaded_avatar_id FROM users")
+                .find_each do |optimized_image|
     optimized_image.destroy!
     putc "." if (i += 1) % 10 == 0
   end