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    <p>The approach that I took with a Rails 2.3.8 app was to spawn a new thread to handle the csv parsing and then use an AJAX call to check the server to see if the file was ready (I relied on File.mtime).</p> <p>Just ripped it out of the app to post here so I've removed <strong>alot</strong> of the csv parsing code, and haven't included all of the views</p> <p>sorry end of the day rush :D</p> <p>controllers/exports_controller.rb</p> <pre><code> class ExportsController &lt; ApplicationController require 'fastercsv' require 'generic_agent' require 'generic_record' def listing @this_filepath = "../html/whatever/" &lt;&lt; Time.now.strftime("%I:%M:%S_%d:%m:%y") &lt;&lt; ".csv" @spawn_id = spawn(:nice =&gt; 1) do FasterCSV.open(@this_filepath, "w") do |csv| csv &lt;&lt; [ "outbreak_id"] end end render :update do |page| page.replace_html 'export_status', :partial =&gt; 'export_status_partial' end end def send_export @this_filepath = params[:with] csv_file = File.open(@this_filepath.to_s, 'r') csv_string = "" csv_file.each_line do |line| csv_string &lt;&lt; line end send_data csv_string, :filename =&gt; "export.csv", :type =&gt; 'text/csv; charset=iso-8859-1; header=present', :disposition =&gt; "attachment; filename=export.csv" #send_file @this_filepath.to_s, :stream =&gt; false, :type=&gt;"text/csv", :x_sendfile=&gt;true #send_data csv_string, :filename =&gt; export.csv #File.delete(@this_filepath.to_s) end def export_checker filename_array = params['filename'].split(/\//) @file_found = 0 @file_ready = 0 @file_size = File.size(params['filename']) @this_filepath = params['filename'] if File.exists?(params['filename']) release_time = Time.now - 5.seconds if File.mtime(params['filename']).utc &lt; release_time.utc @file_found = 1 @file_ready = 1 @file_access_time = File.mtime(params['filename']) @file_release_time = release_time @file_size = File.size(params['filename']) else @file_found = 1 @file_ready = 0 @file_size = File.size(params['filename']) end else @file_found = 0 @file_ready = 0 @file_size = File.size(params['filename']) end render :action =&gt; "export_checker" end end </code></pre> <p>views/exports/export_checker.rjs</p> <pre><code>if @file_found == 1 &amp;&amp; @file_ready == 1 &amp;&amp; @file_size &gt; 0 page.replace_html 'link_to_file', :partial =&gt; "export_ready" if @file_release_time page.replace_html 'notice', "&lt;div&gt;Completed #{@file_release_time.strftime("%I:%M:%S %A %d %B %Y")} :: file size #{@file_size.to_s}&lt;/div&gt;" end page.visual_effect :highlight, 'link_to_file', :endcolor =&gt; '#D3EDAB' elsif @file_found == 1 page.replace_html 'link_to_file', "&lt;div&gt; File found, but still being constructed.&lt;/div&gt;&lt;div&gt;#{@this_filepath.to_s}&lt;/div&gt;" page.visual_effect :highlight, 'link_to_file', :endcolor =&gt; '#FF9900' else page.replace_html 'link_to_file', "&lt;div&gt; File not found @file_found #{@file_found.to_s} @file_ready #{@file_ready.to_s}&lt;/div&gt;" page.visual_effect :highlight, 'link_to_file', :endcolor =&gt; '#FF0000' end </code></pre>
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