Carrierwave + Fog + S3 remove file without going through a model

Question

I am building an application that has a chat component to it. The application allows users to upload files to the chat. The chat is all javascript but i wanted to use Carrierwave for the uploads because i am using it elsewhere in the application. I am doing the handling of the uploads through AJAX so that i can get into Rails land and let Carrierwave take over.

I have been able to get the chat to successfully upload the files to the correct location in my S3 bucket. The thing i can't figure out is how to delete the files. Here is my code the uploads the files - this is the method that is called from the route that the AJAX call hits.

def upload
  file = File.open(params[:file_0].tempfile)
  uploader = ChatUploader.new
  uploader.store!(file)
end

There is little to no documentation with Carrierwave on how to upload files without going through a model and basically NO documentation on how to remove files without going through a model. I assume it is possible though - i just need to know what to call. So i guess my question is how do i delete files?

UPDATE (11/23)

I got the code to save and delete files from S3 using these methods:

# code to save the file
def upload
    file = File.open(params[:file_0].tempfile)
    uploader = ChatUploader.new
    uploader.store!(file)
    uploader.store_path()
end

# code to remove files
def remove_file
    file = params[:file]
    uploader = ChatUploader.new
    uploader.retrieve_from_store!(file)
    uploader.remove!
end

My only issue now is that the filename for the uploaded file is not correct. It saves all files with a "RackMultipart" and then some numbers which look like a date, time, and identifier? (example: RackMultipart20141123-17740-1tq4j1g) Need to try and use the original filename plus maybe a timestamp for uniqueness.

I believe it has something to do with these two lines:

file = File.open(params[:file_0].tempfile)

and

uploader.store!(file)