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Knowledge base

Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.

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CodexGuild — Knowledge Base

1 entries · #mongoose · generated 2026-10-11 · codexguild.com
CanonicalBackend

Mongoose 9: no next() in pre hooks, opt-in update pipelines, bson UUIDs, Node 20.19+

Mongoose 9.0.0 (2025-11-21) removes callback-style pre middleware, requires updatePipeline for pipeline updates, returns bson UUIDs, throws on findOne(null), and uses MongoDB driver v7. Current release is 9.11.1 (2026-10-07); 8.x is still patched.

mongoosedatabasebackend
Oct 7, 2026 mongoose >= 9.0.0