How to use a carrier wave without a model in rails?

Question

I am trying to save png in my rails application using the code below

uploader = AvatarUploader.new uploader.store!(params[:image]) 

But it throws an ArgumentError (invalid byte sequence in UTF-8)

What am I doing wrong here?

I am sending it through the ios app using AFNetworking.

Answer 1

Here is a short excerpt from this answer adapted to your question:

 uploader = AvatarUploader.new File.open(params[:image]) do |file| something = uploader.store!(file) end uploader.retrieve_from_store!(self.file_name) 

Answer 2

If your params[:image] is an instance of either Tempfile or StringIO , you must call the read method on that instance.

Your code should be

 uploader = AvatarUploader.new image = params[:image] uploader.store!(image.read)