Custom Failure App in Engine

[Curtis Schiewek]

Hello All,

So I have an engine, and inside said engine, I have a custom failure app that I want the engine to use.  I don't want to override the FailureApp in the devise initializer because I don't want to overwrite the Devise config of the main app.  I'm therefore specifying the failure_app in my devise_for call.  I'm requiring the auth_failure just after devise in my engine definition.  

The problem is I'm getting the following error when starting the app:

"failure_app.rb:13:in `<class:FailureApp>': undefined method `routes' for nil:NilClass (NoMethodError)"

Where should I be requiring my FailureApp so that it works?

routes.rb

  devise_for :users, failure_app: 'Api::AuthFailure', controllers: {

    sessions: 'api/devise/sessions',

    registrations: 'api/devise/registrations',

    passwords: 'api/devise/passwords',

    confirmations: 'api/devise/confirmations'

  }

api/auth_failure.rb

module Api

  class AuthFailure < Devise::FailureApp

    def redirect_url

      new_user_session_path

    end

    def respond

      if http_auth?

        http_auth

      else

        redirect

      end

    end

  end

end

api/engine.rb

require 'devise'

require 'api/auth_failure'

module Api

  class Engine < ::Rails::Engine

    isolate_namespace Api

  end

end

Thanks!

[Lucas Mazza]

This should be doable but I can't figure out what is wrong here. Can you reproduce this in a fresh app so anyone else can take a deeper look in the error stack and the engine code? Thanks!

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[Curtis Schiewek]

I stepped through the code, and basically what's happening is Rails.application is nil when that class is being loaded.  I moved the require for the failure app to the routes file, which makes the previous error go away, but now I get 

"undefined local variable or method `new_user_session_path' for #<Api::AuthFailure:0x007fdae8f1b6c8>"

I'm guessing this is happening because I actually haven't defined that url yet.  I guess I can manually generate the new_user_session_path.  Do you see any other alternatives?

[Curtis Schiewek]

I got it working.  I left the require in my routes files and changed the redirect_url method in my failure app to this:

def redirect_url

  engine_route = Rails.application.routes.routes.select{|r| r.app == Api::Engine}.first

  "#{engine_route.path.spec.to_s}/users/sign_in"

end

I think that should be fine, as I'm not allowing the main app the rename the sign_in path, but am I missing something?  Is there a better way I'm not seeing?