从S3下载Carrierwave上传 [英] Download a Carrierwave upload from S3

问题描述

我想下载使用carrierwave上传到S3的图像。该图像在卡片模型上，作为上传者安装。我看到此答案，但无法将该解决方案工作。我的代码是：

I'd like to download an image that was uploaded to S3 using carrierwave. The image is on the Card model, mounted as an uploader. I saw this answer, but had trouble getting that solution to work. My code is:

#download image from S3
uploader = card.image       #image is the mounted uploader
uploader.retrieve_from_store!(File.basename(card.image.url))
uploader.cache_stored_file!

最后一行抛出：...引起异常（未定义的方法body为nil： NilClass）...

that last line throws: "... caused an exception (undefined method `body' for nil:NilClass)..."

我的载波配置如下：

#config/initializers/carrierwave.rb
CarrierWave.configure do |config|
  config.storage = :fog
  config.cache_dir = "#{Rails.root}/tmp/upload"
  ...
end

推荐答案

感谢 apneadiving 。这很简单：

image = MiniMagick::Image::open(card.image.to_s)
image.write(somepath)

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