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copied!<p>Finally find an answer on my question.</p> <p>The error was in these strings of code:</p> <pre><code>params[:qqfile].each do |p| tempfile = open(p.original_filename) puts tempfile @uploader.store!(tempfile) end </code></pre> <p>I have understood, that I need to pass an object <a href="http://api.rubyonrails.org/classes/ActionDispatch/Http/UploadedFile.html" rel="nofollow">ActionDispatch::Http::UploadedFile</a> in Carrierwave store! method. Thats why the mentioned above code shall be the following:</p> <pre><code>params[:qqfile].each do |p| puts p.original_filename puts p @uploader.store!(p) end </code></pre> <p>==================================================================================</p> <p>Hope someone find this solution for multiple file uploading with Carrierwave and without JQuery useful.</p> <p>1) Create an uploader, using Carrierwave.</p> <pre><code> rails g uploader EmailPatterns </code></pre> <p>2) Create a custom action for your controller (watch <a href="http://railscasts.com/episodes/35-custom-rest-actions" rel="nofollow">Railscast#35</a> and <a href="http://railscasts.com/episodes/38-multibutton-form" rel="nofollow">Railscast#38</a> to make it clear) and put there something like this (load_patterns in my case):</p> <pre><code> def load_patterns @uploader = EmailPatternsUploader.new params[:qqfile].each {|p| @uploader.store!(p)} redirect_to contacts_path flash[:success] = "Uploaded successfully" end </code></pre> <p>To make it work you need to specify custom route(config/routes.rb) for your action:</p> <pre><code> resources :contacts do collection { post :load_patterns} end </code></pre> <p>and to create a form, where you will get params with your uploading files (see p.3)</p> <p>3) Create form, where you need to specify the option multiple:true in order to allow user to select several files to load (param name with [ ] is a necessary requirement, because we are loading several files) :</p> <pre><code> <%= form_tag load_patterns_contacts_path, multipart: true, multiple: true do %> <%= file_field_tag 'qqfile[]', id: "upload_pattern", multiple: true %> <%= submit_tag "Load", id: "save_pattern", :class => 'btn btn-primary btn-success', multiple: true%> <% end %> </code></pre> <p>Then your custom action will work.</p>

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