We don't like N+1 queries. Nobody does. If you don't know what we are talking about, please read this article that explains it pretty well.
In order to identify possible N+1 queries, we use the gem bullet.
Please add the gem to both development and test group of the Gemfile since we'll use it also in our tests.
Those are our favourite configurations:
- in development we enable it and we see the issues both a footer in the page and also in the logs
# config/environments/development.rb
config.after_initialize do
Bullet.enable = true
Bullet.bullet_logger = true
Bullet.add_footer = true
end- in test we enable it and raise an exception in case a N+1 is identified (or an unused eager loading)
# config/environments/test.rb
config.after_initialize do
Bullet.enable = true
Bullet.bullet_logger = true
Bullet.raise = true
end