Error-undefined method `add_error_on' for ConfirmationsController:Class-rails4-devise

Question

I am using Rails 4 and devise 3.2. At sign up time, an activation/confirmation link is sent by e-mail to the newly registered user. I have implemented this from this article in the Devise wiki.

Whenever I put same passwords they login without any problem, but it's not working when I make a error of password doesn't match in 1st attempt and put same password in 2nd attempt.

This is the error which shows up

NoMethodError in ConfirmationsController#update
undefined method `add_error_on' for ConfirmationsController:Class

confirmation controller

class ConfirmationsController < Devise::ConfirmationsController

  skip_before_filter :require_no_authentication
  skip_before_filter :authenticate_user!

  # PUT /resource/confirmation
  def update
    with_unconfirmed_confirmable do
      if @confirmable.has_no_password?
        @confirmable.attempt_set_password(params[:user])
        if @confirmable.valid? and @confirmable.password_match?
          do_confirm
        else
          do_show
          @confirmable.errors.clear #so that we wont render :new
        end
      else
        self.class.add_error_on(self, :email, :password_already_set)
      end
    end

    if [email protected]?
      render 'devise/confirmations/new'
    end
  end

  # GET /resource/confirmation?confirmation_token=abcdef
  def show
    with_unconfirmed_confirmable do
      if @confirmable.has_no_password?
        do_show
      else
        do_confirm
      end
    end
    if [email protected]?
      self.resource = @confirmable
      render 'devise/confirmations/new'
    end
  end

  protected

  def with_unconfirmed_confirmable
    original_token = params[:confirmation_token]
    confirmation_token = Devise.token_generator.digest(User, :confirmation_token, original_token)
    @confirmable = User.find_or_initialize_with_error_by(:confirmation_token, confirmation_token)
    if [email protected]_record?
  
      @confirmable.only_if_unconfirmed {yield}
    end
  end

  def do_show
    @confirmation_token = params[:confirmation_token]
    @requires_password = true
    self.resource = @confirmable
    render 'devise/confirmations/show'
  end

  def do_confirm
    @confirmable.confirm!
    set_flash_message :notice, :confirmed
    sign_in_and_redirect(resource_name, @confirmable)
   end
 end

Please help. Thank you.

Answer 1

The error case for the update action in that wiki article is out of date. There is no longer an add_error_on method in Devise. Instead, you can just use the basic ActiveRecord errors object:

@confirmable.errors.add(:email, :password_already_set)

Then, you'll still have a problem, because it needs to assign @confirmable to resource in order for the default views to work correctly (the wiki example does this for all the other error renders, just not this one):

if [email protected]?
  self.resource = @confirmable
  render 'devise/confirmations/new'
end