Display documents count on Topic index (no counter cache)

Gemfile

@@ -74,6 +74,7 @@ group :development do
   gem "bullet"
   gem "hotwire-spark"
   gem "letter_opener"
+  gem "rack-mini-profiler"
   # Use console on exceptions pages [https://github.com/rails/web-console]
   gem "web-console"
 end

Gemfile.lock

@@ -309,6 +309,8 @@ GEM
     raabro (1.4.0)
     racc (1.8.1)
     rack (3.1.16)
+    rack-mini-profiler (4.0.0)
+      rack (>= 1.2.0)
     rack-session (2.1.1)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
@@ -519,6 +521,7 @@ DEPENDENCIES
   pg (~> 1.1)
   propshaft
   puma (>= 5.0)
+  rack-mini-profiler
   rails (~> 8.0.1)
   rails-controller-testing
   requestjs-rails

app/controllers/topics_controller.rb

@@ -5,7 +5,7 @@ class TopicsController < ApplicationController
   before_action :set_topic, only: [ :show, :edit, :tags, :update, :destroy, :archive ]
 
   def index
-    @pagy, @topics = pagy(scope.search_with_params(search_params))
+    @pagy, @topics = pagy(scope.includes(:documents_attachments).search_with_params(search_params))
     @available_providers = other_available_providers
     @languages = scope.map(&:language).uniq.sort_by(&:name)
   end

app/views/topics/_list.html.erb

@@ -6,6 +6,7 @@
       <td class="text-bold-500"><%= topic.uid.truncate(10, omission: "...") if topic.uid %></td>
       <td class="text-bold-500"><%= topic.language.name %></td>
       <td class="text-bold-500"><%= topic.provider.name %></td>
+      <td class="text-bold-500"><%= topic.documents.size %></td>
       <td class="text-bold-500"><%= topic.state %></td>
       <td class="text-end">
         <%= link_to topic, class: "btn btn-primary btn-sm", data: {turbo: false } do %>

app/views/topics/index.html.erb

@@ -28,6 +28,7 @@
                         <th>UID</th>
                         <th>Language</th>
                         <th>Provider</th>
+                        <th>Training<br>Materials</th>
                         <th>State</th>
                         <th class="text-end">Actions</th>
                       </tr>

config/environments/development.rb

@@ -88,4 +88,5 @@
 
   # Apply autocorrection by RuboCop to files generated by `bin/rails generate`.
   # config.generators.apply_rubocop_autocorrect_after_generate!
+  Bullet.add_safelist type: :unused_eager_loading, class_name: "Topic", association: :documents_attachments
 end

spec/requests/topics/index_spec.rb

@@ -19,6 +19,14 @@
       expect(assigns(:topics)).to eq([ topic ])
     end
 
+    it "displays the number of documents" do
+      topic = create(:topic, :with_documents, provider:)
+
+      get topics_url
+
+      expect(page).to have_css("td", text: "1")
+    end
+
     describe "searching" do
       context "with a query" do
         it "filters topics by query" do