Several redirects after user update with devise - ruby-on-rails

Question

I'm trying to create a rails 5 applications with devise that's supposed to act like a social network, so every user has a profile.
After updating the user instead of going back to the profile, the server redirects to localhost, then there is a message Filter chain halted as :require_no_authentication rendered or redirected and only then the user profile is loaded.
Also on the profile a message is shown "You are already signed in".
My goal is to erase those redirects.
I tried to change the redirect in a custom RegistrationController but then it said there are too many redirects so I could't just replace it.
I tried to have different roots for authenticated and unauthenticated users in routes.rb but it didn't change the behaviour
I tried to get behind the :require no authentication but I'm actually not quite sure I understood it correctly and also it didn't change anything.
The after_sign_in_path_for is set to the user profile
This is the server output:
Started PUT "/users" for 127.0.0.1 at 2019-06-04 12:13:37 +0200
Processing by Users::RegistrationsController#update as HTML
Parameters: {"email"=>"asdf#asdf.de", "password"=>"[FILTERED]", "password_confirmat
ion"=>"[FILTERED]", "current_password"=>"[FILTERED]"}, "commit"=>"Update"}
User Load (0.8ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1
User Load (0.6ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT
1
(0.3ms) BEGIN
(0.4ms) COMMIT
Redirected to http://localhost:3000/
Completed 302 Found in 295ms (ActiveRecord: 2.1ms)
Started GET "/" for 127.0.0.1 at 2019-06-04 12:13:37 +0200
Processing by Users::SessionsController#new as HTML
User Load (0.7ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER
BY `users`.`id` ASC LIMIT 1
Redirected to http://localhost:3000/users/1
Filter chain halted as :require_no_authentication rendered or redirected
Completed 302 Found in 15ms (ActiveRecord: 0.7ms)
Started GET "/users/1" for 127.0.0.1 at 2019-06-04 12:13:37 +0200
Processing by UsersController#show as HTML
Parameters: {"id"=>"1"}
User Load (0.6ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER
BY `users`.`id` ASC LIMIT 1
User Load (0.5ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT
1
Rendering users/show.html.erb within layouts/application
Rendered users/show.html.erb within layouts/application (1.1ms)
Rendered shared/_navbar.html.erb (0.7ms)
Completed 200 OK in 162ms (Views: 145.3ms | ActiveRecord: 1.1ms)
Also why does the user get signed in again after updating? Is it correct behaviour?
I cannot seem to fathom where the redirect to localhost ist happening and intervene. Any help would be appreciated.
Edit 1
So, to clarify. I tried to use an authenticated_root but then I get the errormessage Couldn't find User without an ID.
devise_scope :user do
authenticated :user do
root to: 'users#show', as: :authenticated_root
end
root to: 'users/sessions#new'
end
Also I can't manage to change the redirecting from to root to the user profile. So the RegistrationController is unchanged. I would like to say in the update method or somewhere else "after updating go to user profile".

Answer 1

It seems like your root_path is /users/sign_in, and when the user updates his account, you redirect him to the root... but the user is already signed in so he can't access to the new_user_session_pah. The fallback default location configured in Devise is the user's profile, so he's redirected to this route.
Have you configured an authenticated root?
https://github.com/plataformatec/devise/wiki/How-To:-Define-a-different-root-route-for-logged-in-out-users
It should fix your problem (:

Answer 2

I managed to solve it by adding a method to RegistrationController as follows:
def after_update_path_for(resource)
user_path(current_user)
end

Answer 3

That is, after updating user, Rails goes to root_path, that is sessions#new. But user's already logged in, so rails router redirects you to users#show
Why don't you set root "home#index" (or sth like that)
Rails.application.routes.draw do
devise_for :users
authenticated :user do
root 'secret#index', as: :authenticated_root
end
root "home#index"
end
and then, in your application_controller.rb you can just require users to login before using your page
class ApplicationController < ActionController::Base
protect_from_forgery with: :exception
before_action :authenticate_user!
end
If you want to redirect user to users#show after update, you can override the after_update_path_for
class User::RegistrationsController < Devise::RegistrationsController
protected
def after_update_path_for(resource)
user_path(resource)
end
end