URLs in mailer view files using namespaces and custom member actions

I am running Ruby on Rails 3 and I would like to use URLs in mailer view files with namespaces and custom member actions. I read this but I have still problems on implementing that.

In routes.rb I have:

namespace "users" do
  resources :accounts do
    member do
      get 'my_action_name'
      post 'my_action_name'
    end
  end
end

In users_mailer.rb I have:

class Users::Accounts < ActionMailer::Base
  default_url_options[:开发者_开发百科host] = "test_name_site.com"

  def account_delete(account)
    @account = account
    @action_url = users_account_url(:controller => "users/accounts", :action => "my_action_name")
    ...
  end
end

When in the controller I try to do this:

@account = Users::Account.find(params[:id])
Users::Accounts.account_delete(Users::Account.find_by_id(@account.id)).deliver

I get this error:

ActionController::RoutingError (No route matches {:action=>"my_action_name", :controller=>"users/accounts"})

How I can solve that?

---

In users_mailer.rb I tryed also

# the difference is: from 'users_account_url' to 'users_accounts_url'
@action_url = users_accounts_url(:controller => "users/account_authentications", :action => "confirm_account_authentication_delete")

# the difference is: from 'users_account_url' to 'url_for'
@action_url = url_for(:controller => "users/account_authentications", :action => "confirm_account_authentication_delete")

but it doesn't work.

---

You are not specify an ID of a record in users_account_url try this

@action_url = my_action_name_users_account_url(account)

http://0.0.0.0:3000/users/accounts/1/my_action_name

Routing gude