Friday, September 28, 2018
Yeah, I created a Rails 3 and Rails 4 project. Rails 3 doesn't support #cache_key on collection, and Rails 4 uses each individual element to create a cache key.
I set up byebug and traced the #cache view helper. The reason the relation is being loaded is because the helper eventually calls #to_a on the relation, which of course results in the query being executed.
Looks like the best solution is using #cache_key directly.
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