Ruby On Rails - Devise - sessions_controller : undefined 'build_resource'

Question

I'm a beginner with Ruby On Rails and I tried all I can but I can't solve my problem...

I use devise and I want to use recaptcha on the sign_in and the sign_up pages. So I overwrite the devise sessions and registrations controllers to make my own create method in which I check the validity of the captcha.

So, I made like above:

In my own registrations_controller.rb:

class RegistrationsController < Devise::RegistrationsController
  def create
    if verify_recaptcha
      super
    else
      build_resource
      resource.errors.clear
      resource.errors.add(:base, "Wrong captcha, try again.")
      render :new
    end
  end
end

In my own sessions_controller.rb:

class SessionsController < Devise::SessionsController 
  def create
    if verify_recaptcha
      super
    else
      build_resource
      resource.errors.clear
      resource.errors.add(:base, "Wrong captcha, try again.")
      render :new
    end
  end
end

For the sign_up page, it works well, but for the sign_in page I have a problem because the method 'buil_resource' is protected in the Devise sessions controller. (I read this : Ruby Devise, SessionsController.create, json - getting NameError: undefined 'build_resource'?) I tried all the solutions I found but none works --> I don't know what to do now...

I'll be grateful for any help on this point : by what can I replace this method ?

---------------------------------------------- EDIT ----------------------------------------------

I use the code from the new method of Devise::SessionsController like above and it works pretty well:

class SessionsController < Devise::SessionsController 
  def create
    if verify_recaptcha
      super
    else
      self.resource = resource_class.new(sign_in_params)
      #flash[:alert] = "Wrong captcha, try again."
      resource.errors.clear
      resource.errors.add(:base, "Wrong captcha, try again.")
      respond_with_navigational(resource, serialize_options(resource)) { render :new }
    end
  end
end

Now, the only thing is I don't see the error "Wrong captcha, try again" if I type a wrong captcha.

I have the solution to use flash[:alert] like in the commented line but it's not printed the same way so if someone know why I don't see the resource errors, please give it to me ! :)

You tried putting include Devise::Controllers::InternalHelpers inside your sessions controller, and that didn't work? Because that is supposed to give you access to build_resource outside of the RegistrationsController — JTG
Thanks for your response but I already tried and I get the error : unitialized constant Devise::Controllers::InternalHelpers — Matthieu.P

Štefan Bartoš Štefan Bartoš · Accepted Answer · 2016-06-22T11:41:41

You can try this:

class SessionsController < Devise::SessionsController 
  def create
    if verify_recaptcha
      super
    else
      self.resource = resource_class.new(sign_in_params)
      resource.valid?
      resource.errors.add(:base, "Wrong captcha, try again.")
      respond_with_navigational(resource, serialize_options(resource)) { render :new }
    end
  end
end

My problem was that only captcha was in resource.errors, but other attributes not, so I'm validate resource by resource.valid? after creating object and everything is fine now.

Ruby On Rails - Devise - sessions_controller : undefined 'build_resource'

1 Answers