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Prefer DB-derived columns over recomputed values

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Instead of recomputing aggregates like a product's star rating on every render, store them as columns updated via after_create/after_destroy callbacks on the child model. Saves CPU on every cached-miss render, especially for complex calculations.

type
recommendation
takeaway Prefer DB-derived columns over recomputed values
about
Fragment Caching concept
Complements fragment caching by avoiding recomputation.
takeaway Prefer DB-derived columns over recomputed values
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Better WebPerformance with Rails talk
Demonstrated by storing number_of_stars as a column via callbacks.

Provenance

Created in
Better WebPerformance with Rails — Stefan Wintermeyer at ... 2026-04-17 16:18
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