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Avoid instance_exec for controller callbacks by jhawthorn · Pull Request #43335...
source link: https://github.com/rails/rails/pull/43335
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When a proc is passed to a callback (either as a condition or as the callback itself) it is evaluated using instance_exec on the controller instance. Calling instance_exec creates a new singleton class for the object, which then will require new inline method caches.
This commit avoids creating the extra controller singleton classes when :only or :except are passed to a callback.
I made an exaggerated benchmark showing the effect: https://gist.github.com/jhawthorn/bded5bc1d5f1afd4cdd7fb5b800312e1
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