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What is caching in Rails?

Updated May 24, 2026

Short answer

Caching stores computed results to improve performance.

Deep explanation

Rails supports page, action, and fragment caching.

Real-world example

Caching blog post pages.

Common mistakes

  • Not expiring cache when data changes.

Follow-up questions

  • What is fragment caching?
  • What is Russian doll caching?

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