Rails - Sep 2010 - file_field

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

You can find:

<%= file_field ''upload'', ''datafile'' %>

I saw the file_field documentation from here:

http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-file_field

But, still cannot get how the parameters ''upload'' and
''datafile'' work.

Based on the documentation:

upload ---> object_name
datafile ---> method

How is that?

Can you clarify on this?

Thanks.
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