added rails_admin gem as an alternative for activescaffold

back-office/config/initializers/rails_admin.rb

@@ -0,0 +1,34 @@
+RailsAdmin.config do |config|
+
+  ### Popular gems integration
+
+  ## == Devise ==
+  # config.authenticate_with do
+  #   warden.authenticate! scope: :user
+  # end
+  # config.current_user_method(&:current_user)
+
+  ## == Cancan ==
+  # config.authorize_with :cancan
+
+  ## == PaperTrail ==
+  # config.audit_with :paper_trail, 'User', 'PaperTrail::Version' # PaperTrail >= 3.0.0
+
+  ### More at https://github.com/sferik/rails_admin/wiki/Base-configuration
+
+  config.actions do
+    dashboard                     # mandatory
+    index                         # mandatory
+    new
+    export
+    bulk_delete
+    show
+    edit
+    delete
+    show_in_app
+
+    ## With an audit adapter, you can add:
+    # history_index
+    # history_show
+  end
+end

back-office/config/routes.rb

@@ -1,5 +1,6 @@
 Rails.application.routes.draw do
 
+  mount RailsAdmin::Engine => '/admin', as: 'rails_admin'
   resources :filter_criteria_values do as_routes end
   resources :filter_criteria do as_routes end
   resources :item_in_carts do as_routes end