Rails - Jun 2014 - Button invokes "update" instead of "index"

I have nested resources

  resources :dicts do
    resources :cards
  end

and in my form

  form_for [@dict,@card] do |f|

I have the following button:

  <%= f.submit('LIST ALL', url: dict_cards_path(@dict.id),
class:'kanren_button', name:'list_all', method: :get) %>

The generated HTML code is:

   <input class="kanren_button" method="get"
name="back_to_list"
type="submit" url="/dicts/6/cards" value="BACK TO
LIST" />

I would expect that clicking this button would call Card.index, but I
get instead the error message

  The action 'update' could not be found for CardsController

It is correct that I don't have a CardsController.update yet, but I
don't think I should need one at this point.

The output from 'rake routes|grep card' looks fine for me:

    dict_cards GET    /dicts/:dict_id/cards(.:format)
cards#index
               POST   /dicts/:dict_id/cards(.:format)
cards#create
 new_dict_card GET    /dicts/:dict_id/cards/new(.:format)      cards#new
edit_dict_card GET    /dicts/:dict_id/cards/:id/edit(.:format)
cards#edit
     dict_card GET    /dicts/:dict_id/cards/:id(.:format)
cards#show
               PATCH  /dicts/:dict_id/cards/:id(.:format)
cards#update
               PUT    /dicts/:dict_id/cards/:id(.:format)
cards#update
               DELETE /dicts/:dict_id/cards/:id(.:format)
cards#destroy

What did I do wrong?

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