Paperclip throws NoHandlerError with base64 photo

Asked by on 2012-11-27T11:21:22-05:00
When upgrading from paperclip 2 to paperclip 3 my image upload API brakes. This code used to work :

def decode_cover_image_data(cover_image_data)
 data = StringIO.new(Base64.decode64(cover_image_data))
 data.class.class_eval { attr_accessor :original_filename, :content_type }
 data.original_filename = "cover.png"
 data.content_type = "image/png"

 self.photo = data
end
It now raises a NoHandleError exception :

"Paperclip::AdapterRegistry::NoHandlerError (No handler found for "/9j/4AAQD/4Q[...]wooooGf/9k="

Did anybody encounter this problem ?

Thanks

Best Answer

Answered by on 2012-12-08T02:37:47-05:00
I found where the problem was coming from, it's quite stupid...

In my controller update method i had something like :

 def update
 ...
 if p[:photo]
 @user_ipad.decode_cover_image_data(p[:photo])
 end

 unless @user_ipad.update_attributes(p)
 render :json => {:errors => @user_ipad.errors}
 end
 end
The issue is that i'm setting the user photo 2 times :

  • Once in @user_ipad.decode_cover_image_data(p[:photo])
  • Once in @user_ipad.update_attributes(p)
The crash occured when saving the base64 string (still in the parameters) with update_attributes. Actually what surprise me is that this piece of code works with Paperclip 2.4.5 ...

After upgrading to Paperclip 3.3.1 i solved my problem by replacing my update method with this :

 def update
 ...
 if p[:photo]
 p[:photo] = @user_ipad.decode_cover_image_data(p[:photo])
 end

 unless @user_ipad.update_attributes(p)
 render :json => {:errors => @user_ipad.errors}
 end
 end
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