forms - Rails - select_tag / chechbox tag issue - can't get array of IDs -

i've got list of products in form that's resource want submit. works without using label tag, want label tag working.

                    <%= label_tag "product_ids[#{product.id}]" %>                       <%= check_box_tag "product_ids[#{product.id}]" %>                       <%= product.name %>                     <% end %> 

this produces following output:

"product_ids"=>{"2"=>"1", "6"=>"1", "3"=>"1"} 

is possible array of ids , not hash?

change

<%= check_box_tag "product_ids[]", nil, nil, id: "product_ids[#{product.id}]"  %>  

and params['product_ids[]']

try way?