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    <p>You are very close. Check the <strong>class type</strong> of <code>params[:uploaded_file]</code>, it should typically be either a <a href="http://ruby-doc.org/stdlib/libdoc/stringio/rdoc/classes/StringIO.html" rel="noreferrer"><code>StringIO</code></a> or a <a href="http://ruby-doc.org/stdlib/libdoc/tempfile/rdoc/classes/Tempfile.html" rel="noreferrer"><code>Tempfile</code></a> object -- both of which already act as files, and can be read using their respective <code>read</code> method(s).</p> <p>Just to be sure (the class type of <code>params[:uploaded_file]</code> may vary depending on whether you are using Mongrel, Passenger, Webrick etc.) you can do a slightly more exhaustive attempt:</p> <pre><code># Note: use form validation to ensure that # params[:uploaded_file] is not null file_data = params[:uploaded_file] if file_data.respond_to?(:read) xml_contents = file_data.read elsif file_data.respond_to?(:path) xml_contents = File.read(file_data.path) else logger.error "Bad file_data: #{file_data.class.name}: #{file_data.inspect}" end </code></pre> <p>If, in your case, it turns out that <code>params[:uploaded_file]</code> is a hash, make sure that you have not mistakingly flipped the <code>object_name</code> and <code>method</code> parameters when invoking <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#M001610" rel="noreferrer"><code>file_field</code></a> in your view, or that your server is not giving you a hash with keys like <code>:content_type</code> etc. (in which case please comment on this post with the <code>Bad file_data ...</code> output from <code>development.log</code>/<code>production.log</code>.)</p>
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    1. COHi Vlad! Thank you for your response. I wasn't exactly sure how to use your code. When I parse, do I call file_data or xml_contents somehow. Like I was just setting xml = File.read(params[:upfile]) then I parse(xml) So, I wasn't sure, but not one to stop there, I tried a few different things. I tried using both Webrick and Thin to see if the results were the same... they were. When using File.read(params[:upfile]), I get a "can't convert HashWithIndifferentAccess into String" Could it be how upfile is begin passed in? "uploaded_file"=>{"uploaded_file"=>#<File:C:/Use...
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    2. COWhen I try to use the path xml = File.read(params[:upfile].path) I get an undefined method 'path' Could there be something wrong with my "view"? I've edited my question above to include it.
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    3. COI've been playing around with my View. I'm now using: <% form_for :feed, :url => { :controller => 'feeds', :action => 'parse' } do |f| %> and when I now submit the uploaded file, I get a TypeError "can't convert nil into String" So, I guess something isn't getting passed in correctly.
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