Add Prosopite for N+1 query detection

FEATURES.md

@@ -20,6 +20,12 @@ Uses [Strong Migrations][] to catch unsafe migrations in development.
 
 [Strong Migrations]: https://github.com/ankane/strong_migrations
 
+### Prosopite
+
+Uses [Prosopite][] to detect N+1 queries in development and test.
+
+[Prosopite]: https://github.com/charkost/prosopite
+
 ### Seed Data
 
 Follows [our guidance][seed-data-guide] for managing seed data. Use
@@ -57,12 +63,8 @@ The following environment variables are available in `production`:
 
 ### All Environments
 
-- Enables [strict_loading_by_default][].
-- Sets [strict_loading_mode][] to `:n_plus_one`.
 - Enables [require_master_key][].
 
-[strict_loading_by_default]: https://guides.rubyonrails.org/configuring.html#config-active-record-strict-loading-by-default
-[strict_loading_mode]: https://guides.rubyonrails.org/configuring.html#config-active-record-strict-loading-mode
 [require_master_key]: https://guides.rubyonrails.org/configuring.html#config-require-master-key
 
 ### Test

NEWS.md

@@ -2,6 +2,7 @@ Unreleased
 
 * Added: AI harness. Downloads `.claude/CLAUDE.md` and `.claude/rules/` from [thoughtbot/guides](https://github.com/thoughtbot/guides/tree/main/rails/ai-rules).
 * Added: [letter_opener](https://github.com/ryanb/letter_opener) for email previews in development
+* Added: [prosopite](https://github.com/charkost/prosopite) for N+1 query detection in development and test
 * Updated: Run the development seeder from `bin/setup`.
 * Updated: Consolidate duplicate gem groups in the generated Gemfile.
 

lib/templates/config/initializers/sidekiq.rb

@@ -7,6 +7,13 @@
 
 Sidekiq.configure_server do |config|
   config.redis = SIDEKIQ_REDIS_CONFIGURATION
+
+  if Rails.env.local?
+    config.server_middleware do |chain|
+      require "prosopite/middleware/sidekiq"
+      chain.add(Prosopite::Middleware::Sidekiq)
+    end
+  end
 end
 
 Sidekiq.configure_client do |config|

lib/templates/web.rb

@@ -37,6 +37,8 @@ def install_gems
 
   gem_group :development, :test do
     gem "factory_bot_rails"
+    gem "pg_query"
+    gem "prosopite"
     gem "rspec-rails", "~> 8.0.0"
   end
 end
@@ -54,6 +56,7 @@ def install_gems
   configure_sidekiq
   configure_action_cable
   configure_strong_migrations
+  configure_prosopite
   configure_mailer_interceptor
   configure_inline_svg
   configure_development_seeder
@@ -219,6 +222,28 @@ def configure_strong_migrations
   rails_command "generate strong_migrations:install"
 end
 
+def configure_prosopite
+  initializer "prosopite.rb", <<~RUBY
+    unless Rails.env.production?
+      require "prosopite/middleware/rack"
+      Rails.configuration.middleware.use(Prosopite::Middleware::Rack)
+    end
+  RUBY
+
+  environment <<~RUBY, env: "development"
+    config.after_initialize do
+      Prosopite.rails_logger = true
+    end
+  RUBY
+
+  environment <<~RUBY, env: "test"
+    config.after_initialize do
+      Prosopite.rails_logger = true
+      Prosopite.raise = true
+    end
+  RUBY
+end
+
 def configure_mailer_interceptor
   lib "email_interceptor.rb", <<~RUBY
     class EmailInterceptor
@@ -280,8 +305,6 @@ def setup_production_environment
 end
 
 def setup_application
-  environment "config.active_record.strict_loading_by_default = true"
-  environment "config.active_record.strict_loading_mode = :n_plus_one_only"
   environment "config.require_master_key = true"
 end
 
@@ -358,6 +381,12 @@ def update_readme
 
       [Strong Migrations]: https://github.com/ankane/strong_migrations
 
+      ### N+1 Query Detection
+
+      Uses [Prosopite][] to detect N+1 queries in development and test.
+
+      [Prosopite]: https://github.com/charkost/prosopite
+
       ### Seed Data
 
       Follows [our guidance][seed-data-guide] for managing seed data.
@@ -407,12 +436,8 @@ def update_readme
 
       ### All Environments
 
-      - Enables [strict_loading_by_default][].
-      - Sets [strict_loading_mode][] to `:n_plus_one`.
       - Enables [require_master_key][].
 
-      [strict_loading_by_default]: https://guides.rubyonrails.org/configuring.html#config-active-record-strict-loading-by-default
-      [strict_loading_mode]: https://guides.rubyonrails.org/configuring.html#config-active-record-strict-loading-mode
       [require_master_key]: https://guides.rubyonrails.org/configuring.html#config-require-master-key
 
       ### Test