ruby on rails - How redirect 'Confirmation token invalid' on Devise -

i configured rails application devise :confirmable , after registration user receives email confirmation link. when user click in link second time token invalid expected behavior in application. however, sends user page located @ "app\views\devise\confirmations\new.html.erb" error 'confirmation token invalid' , want show error(<%= devise_error_messages! %>), in sign in page. (actually, there 2 possible states: a) token expired , user not confirmed user must ask token once again; b) token expired , user confirmed user must sign in)

for this, inherited devise::confirmationscontroller creating own confirmationscontroller override show method can redirect sign in page if there error follows:

class confirmationscontroller  < devise::confirmationscontroller    def after_confirmation_path_for(resource_name, resource)     super   end    def new     super   end    def after_resending_confirmation_instructions_path_for(resource_name)     super   end    def create     super   end    def show     self.resource = resource_class.confirm_by_token(params[:confirmation_token])      if resource.errors.empty?       set_flash_message(:notice, :confirmed) if is_navigational_format?       sign_in(resource_name, resource)       respond_with_navigational(resource){ redirect_to             after_confirmation_path_for(resource_name, resource) }     else         respond_with_navigational(resource.errors, :status => :unprocessable_entity){ render 'devise/sessions/new'  }     end   end  end 

and in routes.rb have configuration:

get "confirmations/show"  devise_for :users, :path => '', :path_names => {:sign_in => 'login', :sign_out => 'logout'}, :controllers => {:confirmations => 'confirmations'} (...) 

it redirects sign in page, can't pass error(s) present in resources.errors sign in page doesn't matter how hard try. how can solve problem?

btw, user model configured in way:

devise :database_authenticatable, :registerable, :confirmable,     :recoverable, :rememberable, :trackable, :validatable 

the thing need change in confirmation_instructions.html.erb

just replace line

<p><%= link_to 'confirm account', confirmation_url(@resource, :confirmation_token =>  @resource.confirmation_token) %></p> 

with this

<p><%= link_to 'confirm account', confirmation_url(@resource, :confirmation_token => @token) %></p> 

that's it.