fix guest lookup to be unscoped (#2395)

* fix guest lookup to be unscoped

app/controllers/application_controller.rb

@@ -18,6 +18,7 @@ class ApplicationController < ActionController::Base
   with_themed_layout '1_column'
 
   include HykuHelper
+  include DeviseGuestControllersHelpersDecorator
 
   helper_method :current_account, :admin_host?, :home_page_theme, :show_page_theme, :search_results_theme
   before_action :authenticate_if_needed

app/controllers/devise_guest_controllers_helpers_decorator.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# OVERRIDE devise-invitable 2.0.9 to unscope user look up
+module DeviseGuestControllersHelpersDecorator
+  def guest_user
+    return @guest_user if @guest_user
+
+    if session[:guest_user_id]
+      begin
+        @guest_user = User.unscoped.find_by(User.authentication_keys.first => session[:guest_user_id])
+      rescue
+        @guest_user = nil
+      end
+      @guest_user = nil if @guest_user.respond_to?(:guest) && !@guest_user.guest
+    end
+
+    @guest_user ||= begin
+                      u = create_guest_user(session[:guest_user_id])
+                      session[:guest_user_id] = u.send(User.authentication_keys.first)
+                      u
+                    end
+
+    @guest_user
+  end
+end
+
+DeviseGuests::Controllers::Helpers.prepend(DeviseGuestControllersHelpersDecorator)