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.

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Answer 1

It's probably because you forgot to run:

rake db:migrate

Answer 2

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

Answer 3

Even after running the migration on heroku, the error persisted.

I found that a heroku restart command was required to vanquish the error forever.

heroku restart