Set a TTL on every cached object

Caching is hard enough on its own, and it’s only made harder when trying to debug a user hitting a stale cache. Instead of letting a cached object become very stale, set a sane time-to-live (TTL) on it so that it automatically expires.

Good 🔗

Rails.cache.fetch("some-key", expires_in: 12.hours) do
  operation
end

Bad 🔗

Rails.cache.fetch("some-key") do
  operation
end