basic rails admin config -- need to fix multitenancy + allowing administration to happen on a per subdomain basis

Gemfile

@@ -128,3 +128,5 @@ gem "strong_migrations"
 gem "simple_calendar", "~> 3.0"
 
 gem "icalendar", "~> 2.9"
+
+gem "rails_admin", "~> 3.1"

Gemfile.lock

@@ -84,6 +84,10 @@ GEM
       globalid (>= 0.3.6)
     activemodel (6.1.5)
       activesupport (= 6.1.5)
+    activemodel-serializers-xml (1.0.2)
+      activemodel (> 5.x)
+      activesupport (> 5.x)
+      builder (~> 3.1)
     activerecord (6.1.5)
       activemodel (= 6.1.5)
       activesupport (= 6.1.5)
@@ -266,6 +270,18 @@ GEM
     json (2.5.1)
     jsonapi-serializer (2.2.0)
       activesupport (>= 4.2)
+    kaminari (1.2.2)
+      activesupport (>= 4.1.0)
+      kaminari-actionview (= 1.2.2)
+      kaminari-activerecord (= 1.2.2)
+      kaminari-core (= 1.2.2)
+    kaminari-actionview (1.2.2)
+      actionview
+      kaminari-core (= 1.2.2)
+    kaminari-activerecord (1.2.2)
+      activerecord
+      kaminari-core (= 1.2.2)
+    kaminari-core (1.2.2)
     kramdown (2.4.0)
       rexml
     listen (3.5.1)
@@ -299,6 +315,7 @@ GEM
     multi_xml (0.6.0)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
+    nested_form (0.3.2)
     net-scp (3.0.0)
       net-ssh (>= 2.6.5, < 7.0.0)
     net-ssh (6.1.0)
@@ -358,6 +375,12 @@ GEM
     rails-i18n (7.0.6)
       i18n (>= 0.7, < 2)
       railties (>= 6.0.0, < 8)
+    rails_admin (3.1.2)
+      activemodel-serializers-xml (>= 1.0)
+      kaminari (>= 0.14, < 2.0)
+      nested_form (~> 0.3)
+      rails (>= 6.0, < 8)
+      turbo-rails (~> 1.0)
     railties (6.1.5)
       actionpack (= 6.1.5)
       activesupport (= 6.1.5)
@@ -558,6 +581,7 @@ DEPENDENCIES
   rack-mini-profiler (~> 3.0)
   rails (~> 6.1.5)
   rails-controller-testing
+  rails_admin (~> 3.1)
   ransack
   recaptcha
   redis-namespace (~> 1.8)
@@ -587,7 +611,7 @@ DEPENDENCIES
   will_paginate
 
 RUBY VERSION
-   ruby 3.0.0p0
+   ruby 2.6.6p146
 
 BUNDLED WITH
    2.1.4

app/javascript/packs/rails_admin.js

@@ -0,0 +1,2 @@
+import "rails_admin/src/rails_admin/base";
+import "../stylesheets/rails_admin.scss";

app/javascript/stylesheets/rails_admin.scss

@@ -0,0 +1 @@
+@import "rails_admin/src/rails_admin/styles/base";

config/initializers/rails_admin.rb

@@ -0,0 +1,47 @@
+RailsAdmin.config do |config|
+  config.asset_source = :webpacker
+
+  ### Popular gems integration
+
+  config.authenticate_with do
+    warden.authenticate! scope: :user
+  end
+  config.current_user_method(&:current_user)
+
+  ## == Devise ==
+  # config.authenticate_with do
+  #   warden.authenticate! scope: :user
+  # end
+  # config.current_user_method(&:current_user)
+
+  ## == CancanCan ==
+  # config.authorize_with :cancancan
+
+  ## == Pundit ==
+  # config.authorize_with :pundit
+
+  ## == PaperTrail ==
+  # config.audit_with :paper_trail, 'User', 'PaperTrail::Version' # PaperTrail >= 3.0.0
+
+  ### More at https://github.com/railsadminteam/rails_admin/wiki/Base-configuration
+
+  ## == Gravatar integration ==
+  ## To disable Gravatar integration in Navigation Bar set to false
+  # config.show_gravatar = true
+
+  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

config/initializers/rails_admin_controller.rb

@@ -0,0 +1,34 @@
+Rails.application.config.to_prepare do
+  RailsAdmin::ApplicationController.class_eval do
+    before_action :switch_tenant
+
+    def switch_tenant
+      Apartment::Tenant.switch!(Apartment::Tenant.current)
+    end
+
+    # def reload_rails_admin
+    #   Rails.application.eager_load!
+    #   excluded_models = ApplicationRecord.descendants.map { |m| m.name unless m.base_class.table_exists? }.compact
+    #   puts "Excluded models: #{excluded_models}"
+
+    #   RailsAdmin::Config.reset
+    #   RailsAdmin.config do |config|
+    #     config.excluded_models = excluded_models
+
+    #     config.actions do
+    #       dashboard
+    #       index
+    #       new
+    #       export
+    #       bulk_delete
+    #       show
+    #       edit
+    #       delete
+    #       show_in_app
+    #     end
+    #   end
+    # end
+
+  end
+end
+

config/routes.rb

@@ -119,7 +119,9 @@ def self.matches?(request)
     post '/users/sign_in/otp' => 'users/otp/sessions#create'
   end
   # system admin panel authentication (ensure public schema as well)
-  get 'sysadmin', to: 'admin/subdomain_requests#index'
+  # get 'sysadmin', to: 'admin/subdomain_requests#index'
+  mount RailsAdmin::Engine => '/sysadmin', as: 'rails_admin'
+
   namespace :admin do
     authenticate :user, lambda { |u| u.global_admin? } do
       mount Sidekiq::Web => '/sidekiq'

package.json

@@ -17,6 +17,7 @@
     "moment": "^2.29.4",
     "popper.js": "^1.16.1",
     "rails-erb-loader": "^5.5.2",
+    "rails_admin": "3.1.2",
     "select2": "^4.1.0-rc.0",
     "sortablejs": "^1.14.0",
     "stimulus": "^3.2.1",
@@ -35,5 +36,8 @@
     "node": "14.x || 10.x",
     "yarn": "1.22.x",
     "npm": "6.14.x"
+  },
+  "resolutions": {
+    "rails_admin/@fortawesome/fontawesome-free": "^5.15.0"
   }
 }