use route url helpers instead of hardcoding

app/controllers/sessions_controller.rb

@@ -22,7 +22,7 @@ class SessionsController < ApplicationController
   def create
     @user = User.from_omniauth(request.env['omniauth.auth'])
     session[:user_id] = @user.id
-    redirect_to @user.room_url
+    redirect_to meeting_room_url(resource: 'rooms', id: @user.encrypted_id)
   rescue => e
     logger.error "Error authenticating via omniauth: #{e}"
     redirect_to root_path

app/models/user.rb

@@ -43,10 +43,6 @@ class User < ApplicationRecord
     auth_hash['info']['email']
   end
 
-  def room_url
-    "#{Rails.configuration.relative_url_root}/rooms/#{encrypted_id}"
-  end
-
   def set_encrypted_id
     self.encrypted_id = "#{username[0..1]}-#{Digest::SHA1.hexdigest(uid+provider)[0..7]}"
   end

app/views/shared/_signup.html.erb

@@ -17,9 +17,9 @@
   <% if current_user %>
   <div class="text-center">
     <% if @main_room %>
-      <span><%= t('logged_in_description_html', link: link_to(current_user.name, current_user.room_url)) %></span>
+      <span><%= t('logged_in_description_html', link: link_to(current_user.name, meeting_room_url(resource: 'rooms', id: current_user.encrypted_id))) %></span>
     <% else %>
-      <%= link_to(t('return_to_room'), current_user.room_url) %>
+      <%= link_to(t('return_to_room'), meeting_room_url(resource: 'rooms', id: current_user.encrypted_id)) %>
     <% end %>
     <div><%= link_to t('logout'), user_logout_url %></div>
   </div>