How to upload a file temporarily in Rails 3?

I'm creating CSV-upload functionality for a site of mine. I'm looking to upload a file, parse it, and then dispose of it.

I know I can upload and save a file using Paperclip, but that seems a bit like overkill.

All I need to do is parse the uploaded file and never save it. How would I go about doing this in Rails 3?

Note: I'd prefer to do the uploading manually without using an external gem so I can learn how to process works, but any suggestions are welcome.



Use the file_field helper in your form, then in your controller you can use File.Write and to save the file.

E.g. View

<%= form_for @ticket do |f| %>
  <%= f.file_field :uploaded_file %>
<% end %>


def upload
  uploaded = params[:ticket][:uploaded_file]<insert_filename_here>, 'w') do |file|

Edit: Just saw @klochner's comment, that link says pretty much what I have said so follow that: RubyOnRails Guides: Uploading Files.

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