<%= simple_form_for @advertisement, :html => {:multipart => true} do |f| %> <%= f.input :file, :as => :file %> <%= f.input :referral_url %> <%= f.input :ad_type, :collection => %w(vertical horizontal) %> <%= f.input :status, :collection => %w(active inactive) %> <%= f.button :submit %> <% end %>