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    <p><strong>Rails 4:</strong></p> <p>in routes:</p> <pre><code>get "home/download_pdf" </code></pre> <p>in controller (already have pdf):</p> <pre><code>def download_pdf send_file( "#{Rails.root}/public/your_file.pdf", filename: "your_custom_file_name.pdf", type: "application/pdf" ) end </code></pre> <p>in controller (need to generate pdf):</p> <pre><code>require "prawn" class ClientsController &lt; ApplicationController def download_pdf client = Client.find(params[:id]) send_data generate_pdf(client), filename: "#{client.name}.pdf", type: "application/pdf" end private def generate_pdf(client) Prawn::Document.new do text client.name, align: :center text "Address: #{client.address}" text "Email: #{client.email}" end.render end end </code></pre> <p>in view:</p> <pre><code>&lt;%= link_to 'Download PDF', home_download_pdf_url %&gt; </code></pre> <p><strong>Rails 3</strong></p> <p>The way to do it:</p> <pre><code>def download send_data pdf, :filename =&gt; "abc.pdf", :type =&gt; "application/pdf" end </code></pre> <p>You should go to this alternative</p> <p><strong>Rails &lt; 3</strong></p> <p><strong>File in public folder</strong></p> <p>This may the the answer to you: <a href="https://stackoverflow.com/questions/6392003/how-to-download-a-file-from-rails-application">How to download a file from rails application</a></p> <p>You should place your file in public folder, that is the trick.</p> <p>Should work when the file is placed correctly.</p> <p>Let me know if you can't move your file to public folder.</p> <p><strong>Download via controller</strong></p> <p>Create a controller with a downlaod action and <code>link_to</code> it</p> <pre><code> def download send_file '/assets/data/abc.pdf', :type=&gt;"application/pdf", :x_sendfile=&gt;true end </code></pre>
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    1. COthat's an old version of rails. since rails 3 (I think) the public folder is assets.
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    2. COok I tried that and it worked. I'm pretty sure all resources should be placed in the assets folder since rails 3 but since it worked it will do for now. thank you.
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    3. COSorry it was not specified which version of rails you were using
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