base64 photo and paperclip -Rails

I want to handle a base64 photo with paperclip.

When I try:

photo = Photo.new 
string = base64string

photo.photo = StringIO.new(Base开发者_如何学JAVA64.decode64(string))
photo.save

It does not work. Why?

Thanks in advance.

---

Make sure that the StringIO you are using is the paperclip opened one. https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/upfile.rb

 sio = StringIO.new(Base64.decode64(string))
 puts sio.respond_to?(:original_filename)
 puts sio.respond_to?(:content_type)

It needs to have those methods in order to have paperclip work with StringIO. Make sure it is setting them.