Just curious why you want to do this without using any database or models 
or gems?

At any rate, check out this tutorial below. It uses a model, but you can 
copy the code from the DataFile class to accomplish what you are trying to 
do.

http://www.tutorialspoint.com/ruby-on-rails/rails-file-uploading.htm 

By the way, that tutorial is the first result in Google when you search for 
"file upload rails" Google is usually a good place to start for questions 
like this.

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