Uploading a file with Rails and ExtJS? - ruby-on-rails-3

I am building RoR project with ExtJS on the client side, but I need uploading a file for process on the server side.
Please anybody can help me?
Thanks in advance
Note: I using ExtJS 4 with the new MVC pattern...

On client side you can use Ext.form.field.File (There is good example illustrating how to use this widget).
This tutorial may help you in organizing server side.

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