Using resource controller and namespace

app/views/spree/admin/digitals/_form.html.erb

@@ -0,0 +1,35 @@
+<div class="yui-g">
+  <div class="yui-u first">
+  <%= form_for(:digital, :url => { :controller => 'digitals', :action => 'create' }, :html => { :multipart => true }) do |f| %>
+    <fieldset>
+      <legend><%= Spree::Variant.model_name.human %> "<%= variant.options_text %>"</legend>
+      
+        <%= f.field_container :current_file do %>
+          <strong><%=t 'current_file' %>:</strong><br/>
+          <% if variant.digital? %>
+            <%= render variant.digital %><%=  %>
+          <% else %>
+            <%=t 'none' %>
+          <% end %>
+        <% end %>
+        
+      <p class="form-buttons">
+        <% if variant.digital? %>
+          <%= link_to t("delete_file"), admin_product_digital_url(:id => variant.digital.id), :confirm => t('delete_file_cofirmation', :filename => variant.digital.attachment_file_name), :method => :delete %>
+        <% else  %>
+
+          <%= f.field_container :file do %>
+            <%= f.label :file, t("new_file") %> <span class="required">*</span><br/>
+            <%= f.file_field :attachment %>
+          <% end %>
+          
+          <%= hidden_field_tag 'digital[variant_id]', variant.id %>
+
+          <%= button t("upload") %>
+        <% end %>
+      </p>
+      
+    </fieldset>
+  <% end %>
+  </div>
+</div><br/>