clean up rails_admin configuration

app/policies/application_policy.rb

@@ -76,7 +76,4 @@ class ApplicationPolicy
     end
     private :require_user!
   end
-  [:dashboard?, :index?, :new?, :export?, :bulk_delete?, :show?, :edit?, :delete?, :show_in_app?,].each do |action|
-    define_method(action) { admin? }
-  end
 end

config/initializers/rails_admin.rb

@@ -14,11 +14,10 @@ RailsAdmin.config do |config|
   ## == Pundit ==
   # config.authorize_with :pundit
   config.authorize_with do
-    redirect_to main_app.root_path unless current_user.admin?
-    # unless current_user.admin?
-    #   flash[:alert] = 'Access denied.'
-    #   redirect_to main_app.root_path
-    # end
+    unless current_user&.admin?
+      flash[:alert] = 'Access denied.'
+      redirect_to main_app.root_path
+    end
   end
 
   ## == PaperTrail ==

config/routes.rb

@@ -1,7 +1,6 @@
 FILENAME_REGEXP = /[\w\.]+/ unless Kernel.const_defined?(:FILENAME_REGEXP)
 
 Rails.application.routes.draw do
-  mount RailsAdmin::Engine => '/rails_admin', as: 'rails_admin'
   resources :error_template_attributes
   resources :error_templates do
     member do
@@ -161,4 +160,5 @@ Rails.application.routes.draw do
   post "/submit", to: 'remote_evaluation#submit', via: [:post]
 
   mount ActionCable.server => '/cable'
+  mount RailsAdmin::Engine => '/rails_admin', as: 'rails_admin'
 end