danbarberphoto/app/controllers/admin/confirmations_controller.rb

module Admin
  class ConfirmationsController < ::Devise::PasswordsController
    layout 'admin/layouts/login'

    skip_before_filter(:authenticate_user!)

    def update
      with_unconfirmed_confirmable do
        if @confirmable.has_no_password?
          update_password
        else
          self.class.add_error_on(self, :email, :password_already_set)
        end
      end

      render_with_scope :new unless confirmable.errors.empty?
    end

    def show
      with_unconfirmed_confirmable do
        if @confirmable.has_no_password?
          do_show
        else
          do_confirm
        end
      end

      render_with_scope :new unless @confirmable.errors.empty?
    end

    private

    def update_password
      @confirmable.attempt_set_password(params[:admin_user])
      if @confirmable.valid?
        do_confirm
      else
        do_show
        @confirmable.errors.clear # so that we won't render :new
      end
    end

    protected

    def with_unconfirmed_confirmable
      @confirmable = AdminUser.find_or_initialize_with_error_by(:confirmation_token, params[:confirmation_token])

      @confirmable.only_if_unconfirmed { yield } unless @confirmable.new_record?
    end

    def do_show
      @confirmation_token = params[:confirmation_token]
      @requires_password = true
      self.resource = @confirmable
      render_with_scope :show
    end

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