未定义的方法`image_will_change！'在Heroku上为CarrierWave [英] Undefined method `image_will_change!' for CarrierWave on Heroku

问题描述

我有一个装载Carrierwave上传器的简单模型。一切工作正常，但我得到一个未定义的方法image_will_change！错误在heroku上。

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

根据Carrierwave Wiki，我也正确设置了cache_dir。

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

推荐答案

很可能您的数据库在heroku上没有收据表中的图像列。

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

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