[Rails] File upload

Hello. I'm new with Rails and I'm trying to create a file upload app.


I want to make that it stores the file in public/data, that only .swf
files can be uploaded and that the filename in my server is the same
from the form (see below).

I currently have these files and want to integrate the upload to that
form, but I don't know how to do that.

Thank you,
Gabriel.

---------------

class SfilesController < ApplicationController
         def new
                 @sfile = Sfile.new
         end

         def create
                 @sfile = Sfile.new(params[:sfile])
                 respond_to do |format|
                         if @sfile.save
                                 flash[:notice] = 'File was successfully 
created.'
                                 format.html { redirect_to(@sfile) }
                         else
                                 format.html { render :action => "new" }
                         end
                 end
         end

         def show
                 @sfile = Sfile.find(params[:id])
         end
end

--------------

class Sfile < ActiveRecord::Base
         validates_presence_of :title
end

----------------

<h1>Welcome</h1>

<% form_for(@sfile) do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </p>
  <p>
    <%= f.label :description %><br />
    <%= f.text_area :description %>
  </p>
  <p>
    <%= f.submit 'Create' %>
  </p>
<% end %>
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