class Devise::ConfirmationsController

def show
  self.resource = resource_class.confirm_by_token(params[:confirmation_token])
  yield resource if block_given?
  if resource.errors.empty?
    set_flash_message!(:notice, :confirmed)
    respond_with_navigational(resource){ redirect_to after_confirmation_path_for(resource_name, resource) }
  else
    # TODO: use `error_status` when the default changes to `:unprocessable_entity`.
    respond_with_navigational(resource.errors, status: :unprocessable_entity){ render :new }
  end
end