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28 lines
1.6 KiB
Markdown
28 lines
1.6 KiB
Markdown
---
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bc-version: [all]
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domain: security
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keywords: [istemporary, deleteall, modifyall, safeguard, precondition]
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technologies: [al]
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countries: [w1]
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application-area: [all]
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---
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# Guard bulk operations with IsTemporary
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> Contributions welcome — open a PR to refine or extend this article.
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## Description
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An AL helper that accepts a `var Rec: Record X` parameter and performs a bulk operation (`DeleteAll`, `ModifyAll`, or an unfiltered loop that mutates every record) cannot tell from the signature alone whether the caller passed a temporary buffer or the real table. A misuse that passes the real table wipes or rewrites live data at production scale with no earlier warning. A single `IsTemporary` check at the procedure entry turns a silent-corruption risk into an early, actionable failure.
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## Best Practice
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Any helper designed to operate on a temporary record, and that performs `DeleteAll`, `ModifyAll`, or similar bulk writes on its parameter, should call `Rec.IsTemporary()` at the top and raise a descriptive error when the assumption is violated. The error message should name the parameter so the misuse is easy to locate.
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See sample: [`guard-bulk-operations-with-istemporary.good.al`](guard-bulk-operations-with-istemporary.good.al).
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## Anti Pattern
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Trusting documentation or naming conventions alone to signal that a `var Rec` parameter is expected to be temporary. A future refactor or a copy-paste caller can pass the real table; the bulk operation then executes against production rows silently.
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See sample: [`guard-bulk-operations-with-istemporary.bad.al`](guard-bulk-operations-with-istemporary.bad.al).
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