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How can I upload multiple files from the server side (without js)? Currently I am using something like this: view.html.erb:

<%= semantic_form_for @user, url: {action: "create"}, html: {method: "post", :multipart => true} do |f| %>
  <div><%= f.input :photos, as: :file, input_html: { multiple: true }  %></div>
  <%= f.submit "Upload" %>
<% end %>

controller:

    params[:user][:photos].each do |file|
      current_user.photos.new(file)
      current_user.save
    end

But it doesn't seem to work. I get "undefined method `stringify_keys' for #Tempfile:/tmp/RackMultipart20140325-7518-143rjhj". Also what is the difference between photos.new and photo_files.new ?

I think there isn't much documentation for the server-side uploads. Many thanks.