How to use carrierwave without a model in rails?

Question

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

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

But it's throwing ArgumentError (invalid byte sequence in UTF-8)

What am i doing wrong here?

I am posting it via an ios app using AFNetworking.

Answer 1

Here's a quick 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)