rqrcode的编码无效 [英] Invalid encoding with rqrcode

问题描述

我遇到了无效的编码错误，该错误使我无法将图像保存到载波上传器。

I'm having an invalid encoding error that doesn't let me save the image to a carrierwave uploader.

require 'rqrcode_png'
img = RQRCode::QRCode.new( 'test', :size => 4, :level => :h ).to_img.to_s

img.valid_encoding? 

=> false

推荐答案

我不确定这是否就是你在寻找的情况下，我需要使用载波将生成的QR码与Rails模型相关联，最终我要做的是将图像保存到临时文件中，将该文件与模型相关联，然后删除该临时文件，这是我的代码：

I'm not sure if this is what you're looking for, in my case I needed to associate the generated QR code with a Rails model using carrierwave, what I ended up doing was saving the image to a temp file, associating that file with the model and afterwards deleting the temp file, here's my code:

def generate_qr_code!
  tmp_path = Rails.root.join('tmp', "some-filename.png")
  tmp_file = RQRCode::QRCode.new(self.hash_value).to_img.resize(200,200).save(tmp_path)

  # Stream is handed closed, we need to reopen it
  File.open(tmp_file.path) do |file|
    self.qr_code = file
  end

  File.delete(tmp_file.path)

  self.save!
end

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