Each loop Haml?

I have this each loop: (haml)

- @deals.each do |a|
     .slide
        %a{:href => "#"}
         - a.attachments.each do |a|
           = image_tag(a.file.url, :height =>"325px", :width =>"650px" )
            .caption{:style => "bottom:0"} 
              = a.description

Because @deals is combined query of 3 tables (models) I use polymorphic_path to generate the links of the images.

- @deals.each do |a|
     .slide
        %a{:href => "#"}
         - a.attachments.each do |a|
           = image_tag(a.file.url, :height =>"325px", :width =>"650px" ), polymorphic_path(@region, @city, a)
            .caption{:style => "bottom:0"} 
              = a.description

But this generates region_city_attachment_path which is not correct. The first each loop a variable store the correct value, but how can I reach the first a variable in the second each loop?