Undefined method `image_will_change!' for CarrierWave on Heroku

Question

I have a simple model that mounts a Carrierwave uploader. Everything works fine in development, but I get an undefined method "image_will_change!" error on heroku.

class Receipt < ActiveRecord::Base   mount_uploader :image, ImageUploader end  class ImageUploader < CarrierWave::Uploader::Base   storage :fog   def store_dir     "receipts/saved"   end end 

I have the cache_dir set appropriately as well according to the Carrierwave Wiki.

receipt.image = File.open "public/images/test.jpg" #works fine in development, fails in heroku 

Answer 1

It's likely that your db on heroku doesn't have the image column in the receipts table.