lib/carrierwave/processing/mini_magick.rb in carrierwave-1.2.2 vs lib/carrierwave/processing/mini_magick.rb in carrierwave-1.2.3

@@ -59,9 +59,16 @@
         require "mini_magick"
       rescue LoadError => e
         e.message << " (You may need to install the mini_magick gem)"
         raise e
       end
+
+      prepend Module.new {
+        def initialize(*)
+          super
+          @format = nil
+        end
+      }
     end
 
     module ClassMethods
       def convert(format)
         process :convert => format