Add Bullet gem to detect N+1 queries.

config/environments/development.rb

@@ -52,4 +52,10 @@ Discourse::Application.configure do
     config.developer_emails = emails.split(",").map(&:downcase).map(&:strip)
   end
 
+  config.after_initialize do
+    Bullet.enable = true
+    Bullet.alert = true
+    Bullet.console = true
+    Bullet.rails_logger = true
+  end
 end