First working version with devise+rails_admin

config/initializers/assets.rb

@@ -12,3 +12,9 @@ Rails.application.config.assets.paths << Rails.root.join('node_modules')
 # application.js, application.css, and all non-JS/CSS in the app/assets
 # folder are already added.
 # Rails.application.config.assets.precompile += %w( admin.js admin.css )
+
+# Workaround for Segfault
+# https://github.com/sass/sassc-ruby/issues/197
+Rails.application.config.assets.configure do |env|
+  env.export_concurrent = false
+end

config/initializers/devise.rb

@@ -143,7 +143,7 @@ Devise.setup do |config|
   # without confirming their account.
   # Default is 0.days, meaning the user cannot access the website without
   # confirming their account.
-  # config.allow_unconfirmed_access_for = 2.days
+  config.allow_unconfirmed_access_for = 2.days
 
   # A period that the user is allowed to confirm their account before their
   # token becomes invalid. For example, if set to 3.days, the user can confirm
@@ -151,7 +151,7 @@ Devise.setup do |config|
   # their account can't be confirmed with the token any more.
   # Default is nil, meaning there is no restriction on how long a user can take
   # before confirming their account.
-  # config.confirm_within = 3.days
+  config.confirm_within = 3.days
 
   # If true, requires any email changes to be confirmed (exactly the same way as
   # initial account confirmation) to be applied. Requires additional unconfirmed_email
@@ -164,7 +164,7 @@ Devise.setup do |config|
 
   # ==> Configuration for :rememberable
   # The time the user will be remembered without asking for credentials again.
-  # config.remember_for = 2.weeks
+  config.remember_for = 8.weeks
 
   # Invalidates all the remember me tokens when the user signs out.
   config.expire_all_remember_me_on_sign_out = true

config/routes.rb

@@ -1,6 +1,8 @@
 Rails.application.routes.draw do
+  get 'pages/home'
   mount RailsAdmin::Engine => '/admin', as: 'rails_admin'
   # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
 
   devise_for :admins
+  root to: "pages#home"
 end