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Mongodb datetrunc binsize zero guard

Skill kjuhwa/skills-hub/skills/backend/mongodb-datetrunc-binsize-zero-guard

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npx -y skills add kjuhwa/skills-hub --skill mongodb-datetrunc-binsize-zero-guard

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Guard MongoDB $dateTrunc binSize against 0 when your interval may be auto/unset; coerce to 1 to avoid runtime error

SKILL.md

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mongodb-datetrunc-binsize-zero-guard

Rule

$dateTrunc.binSize must be >= 1. If your interval resolver returns 0 (e.g. "auto" mode that is resolved later), coerce to 1 at construction time, never ship 0 to MongoDB.

Pattern

int binSize = (interval == 0) ? 1 : interval;
Document dateTrunc = new Document("$dateTrunc", new Document()
    .append("date", "$timestamp")
    .append("unit", unit)
    .append("binSize", binSize));

Why

MongoDB driver rejects binSize: 0 with a runtime error that surfaces only when the aggregation executes — so it slips past unit tests using stubbed intervals. Found in production via SonarQube/Jenkins build (commit 3ad4cf9).

How to apply

Whenever you have a chain userMode → intervalResolver → $dateTrunc, add the guard at the repository/query-builder boundary, not in the resolver (resolver's "auto=0" may be meaningful elsewhere).

What ships with it: 1 file

932 B alongside SKILL.md

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