Edit form fill action with a wrong locale

dummy@example.com (nimbuz77) — Fri, 22 Feb 2013 16:18:48 +0000

Hi all.
I'm using rails 3.2 and I have an issue with all my edit forms.
I'm using a namespace (admin) and nested resources, also I'm using internationalization.
This is my routes.rb:

scope "(:locale)", :locale => /en|it/ do  
    ...
    namespace :admin do
      resources :manufacturers do
        resources :articles, :except => [:index] do
          resources :article_images, :except => [:index, :show]
        end
      end
    end
end

For instance I'm using this form for articles:

<%= form_for([:admin, :manufacturer, @article]) do |f| %>

But it generates this action in the form:

And I get a routing error:

No route matches [PUT] "/3/admin/manufacturers/1/articles/3"

I also tried this:

<%= form_for(admin_manufacturer_articles_path(@article)) do |f| %>

and this:

<%= form_for(admin_manufacturer_articles_path(@article, locale: nil)) do |f| %>

But the fields of the form are "wrong":

What is wrong in my codes?
How can I get my edit forms working?
Thanks to all.

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Edit form fill action with a wrong locale