如何将Base64映像附加到Active Storage对象? [英] How to attach Base64 image to Active Storage object?

问题描述

我可以附加光盘上的png图像，并且一切正常:

I can attach a png image from disc by and everything works just fine:

obj.attachment.attach(
  io: File.open('dog.png'),
  filename: "image_name",
  content_type: "image/png"
)

但是当我保存通过以下方式编码为String之类的String的Base64 png图像时，给出像很小的空正方形这样的结果是行不通的:

But it doesn't work giving result like too tiny empty square when I save a Base64 png image which encoded into String something like that "data:image/png;base64,iVB**..REST OF DATA..**kSuQmCC" by:

obj.attachment.attach(
  io: StringIO.new(encoded_base_sixty_four_img),
  filename: "image_name",
  content_type: "image/png"
)

我也尝试对其进行解码，但是给出了相同的错误:

Also I tried to decoded it but gives the same error:

decoded_base_sixty_four_img = Base64.decode64(encoded_base_sixty_four_img)
obj.attachment.attach(
  io: StringIO.new(decoded_base_sixty_four_img),
  filename: "image_name",
  content_type: "image/png"
)

也尝试将解码后的值写入File，但也无法给出空白图像结果:

Also tried writing this decoded value into a File but nothing worked too giving blank image result:

file = file.write(decoded_base_sixty_four_img)
obj.attachment.attach(
  io: file,
  filename: "image_name",
  content_type: "image/png"
)

还有其他想法吗?

推荐答案

感谢@tadman，当我将其剥离后，Base64.decode64无法处理data:image/png;base64,部分.

Thanks to @tadman, data:image/png;base64, part can't be handled by Base64.decode64 when I stripped it off everything worked fine.

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