Done

app/controllers/admin/stats_controller.rb

@@ -0,0 +1,8 @@
+class Admin::StatsController < ApplicationController
+# the classname must be prefixed by Admin because it is now located in the Admin dir and not at the Controllers root dir
+  def index
+    @post_count = Post.count
+    @authors_count = Author.count
+    @last_post = Post.last
+  end
+end

config/routes.rb

@@ -5,7 +5,21 @@
 
   resources :posts, only: %i[index show new create edit update]
 
-  get '/admin/stats', to: 'stats#index'
+  # original
+  # get '/admin/stats', to: 'stats#index'
+
+  # scope version
+  # scope allows for grouping of routes under a specified URL path. We have further grouped the controllers and views together under Admin, so we need to declare that module
+  # scope '/admin', module: 'admin' do
+  #   resources :stats, only: [:index]
+  # end
+
+  # namespace version
+  # namespacing can be used when want want to use the same name for both the module and the URL prefix
+  # simplified declaration of routes, assumes path prefix and module name match
+  namespace :admin do
+    resources :stats, only: [:index]
+  end
 
   root 'posts#index'
 end

log/development.log

@@ -4470,3 +4470,52 @@ ActionController::RoutingError (No route matches [GET] "/stats"):
   Rendered /Users/scottcreynolds/.rvm/gems/ruby-2.1.2/gems/web-console-2.2.1/lib/web_console/templates/main.js.erb within layouts/javascript (0.2ms)
   Rendered /Users/scottcreynolds/.rvm/gems/ruby-2.1.2/gems/web-console-2.2.1/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.4ms)
   Rendered /Users/scottcreynolds/.rvm/gems/ruby-2.1.2/gems/web-console-2.2.1/lib/web_console/templates/index.html.erb (34.6ms)
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)
+Started GET "/" for 127.0.0.1 at 2021-04-23 12:47:01 -0500
+  ActiveRecord::SchemaMigration Load (1.5ms)  SELECT "schema_migrations".* FROM "schema_migrations"
+Processing by PostsController#index as HTML
+  Rendering posts/index.html.erb within layouts/application
+  Post Load (1.9ms)  SELECT "posts".* FROM "posts"
+  Author Load (1.9ms)  SELECT  "authors".* FROM "authors" WHERE "authors"."id" = ? LIMIT ?  [["id", 1], ["LIMIT", 1]]
+  Author Load (2.1ms)  SELECT  "authors".* FROM "authors" WHERE "authors"."id" = ? LIMIT ?  [["id", 2], ["LIMIT", 1]]
+  Author Load (2.1ms)  SELECT  "authors".* FROM "authors" WHERE "authors"."id" = ? LIMIT ?  [["id", 3], ["LIMIT", 1]]
+  Rendered posts/index.html.erb within layouts/application (270.9ms)
+Completed 200 OK in 2533ms (Views: 2366.7ms | ActiveRecord: 22.3ms)
+
+
+Started GET "/admin/stats" for 127.0.0.1 at 2021-04-23 12:47:11 -0500
+Processing by Admin::StatsController#index as HTML
+   (1.7ms)  SELECT COUNT(*) FROM "posts"
+   (1.7ms)  SELECT COUNT(*) FROM "authors"
+  Post Load (2.1ms)  SELECT  "posts".* FROM "posts" ORDER BY "posts"."id" DESC LIMIT ?  [["LIMIT", 1]]
+  Rendering admin/stats/index.html.erb within layouts/application
+  Rendered admin/stats/index.html.erb within layouts/application (0.8ms)
+Completed 200 OK in 466ms (Views: 374.8ms | ActiveRecord: 5.6ms)
+
+
+Started GET "/admin/stats" for 127.0.0.1 at 2021-04-23 12:50:29 -0500
+Processing by Admin::StatsController#index as HTML
+   (1.4ms)  SELECT COUNT(*) FROM "posts"
+   (1.5ms)  SELECT COUNT(*) FROM "authors"
+  Post Load (2.0ms)  SELECT  "posts".* FROM "posts" ORDER BY "posts"."id" DESC LIMIT ?  [["LIMIT", 1]]
+  Rendering admin/stats/index.html.erb within layouts/application
+  Rendered admin/stats/index.html.erb within layouts/application (1.7ms)
+Completed 200 OK in 643ms (Views: 416.9ms | ActiveRecord: 17.2ms)
+
+
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+Started GET "/assets/application.self-e80e8f2318043e8af94dddc2adad5a4f09739a8ebb323b3ab31cd71d45fd9113.css?body=1" for 127.0.0.1 at 2021-04-23 12:50:30 -0500
+Started GET "/assets/jquery.self-bd7ddd393353a8d2480a622e80342adf488fb6006d667e8b42e4c0073393abee.js?body=1" for 127.0.0.1 at 2021-04-23 12:50:30 -0500
+Started GET "/assets/jquery_ujs.self-784a997f6726036b1993eb2217c9cb558e1cbb801c6da88105588c56f13b466a.js?body=1" for 127.0.0.1 at 2021-04-23 12:50:31 -0500
+Started GET "/assets/turbolinks.self-569ee74eaa15c1e2019317ff770b8769b1ec033a0f572a485f64c82ddc8f989e.js?body=1" for 127.0.0.1 at 2021-04-23 12:50:31 -0500
+Started GET "/assets/authors.self-877aef30ae1b040ab8a3aba4e3e309a11d7f2612f44dde450b5c157aa5f95c05.js?body=1" for 127.0.0.1 at 2021-04-23 12:50:31 -0500
+Started GET "/assets/application.self-3b8dabdc891efe46b9a144b400ad69e37d7e5876bdc39dee783419a69d7ca819.js?body=1" for 127.0.0.1 at 2021-04-23 12:50:31 -0500
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)
+DEPRECATION WARNING: ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement. (called from <top (required)> at /mnt/c/Users/Kristen/dev/flatiron/labs/namespaced-routes-reading-v-000/config/environment.rb:5)