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我正在尝试用 Shrine 保存 pdf 文件。按照 Shrine自述文件,我正在归因

my_model.image = File.open('my_pdf.pdf')

但这会引发错误:

Encoding::UndefinedConversionError: "\xFE" from ASCII-8BIT to UTF-8

我怎样才能做到这一点?有没有办法用 Shrine 保存二进制文件?

这是我正在使用的上传器:

class DocumentUploader < Shrine
  plugin :logging
  plugin :validation_helpers
  plugin :determine_mime_type, analyzer: :mimemagic
  plugin :data_uri

  Attacher.validate do
    validate_max_size 20*1024*1024, message: "is too large (max is 20 MB)"
    validate_mime_type_inclusion %w[
      image/jpeg
      image/gif
      image/bmp
      image/png
      image/tiff
      application/pdf
    ]
  end
end
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