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Lead with a complete plugin quick start and add task-oriented usage, troubleshooting, customization, and contribution guides. Preserve the broader plugin framing, correct conflicting contract guidance, support Agents folder reviews, and align repository validation. Convert existing sample references to clickable links without changing knowledge rules. Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com> Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
28 lines
1.4 KiB
Markdown
28 lines
1.4 KiB
Markdown
---
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bc-version: [all]
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domain: performance
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keywords: [changecompany, loop, cache, multi-company, isolation]
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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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# Do not call ChangeCompany inside a per-row loop
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> Contributions welcome — open a PR to refine or extend this article.
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## Description
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`ChangeCompany` retargets a record variable to another company's data and drops the in-memory caches bound to the previous company. Calling it once per row in a multi-company scan therefore pays a cache reset on every iteration, even when consecutive rows share a company. Agents treat `ChangeCompany` like a filter. It is an isolation switch.
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## Best Practice
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Group work by company. Call `ChangeCompany` once per distinct company, then `FindSet`/`Get` that company's rows. If the record variable is reused afterward, call `ChangeCompany()` without a company name to redirect it back to the current company.
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See sample: [`changecompany-in-loop-drops-caches.good.al`](changecompany-in-loop-drops-caches.good.al).
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## Anti Pattern
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`repeat Rec.ChangeCompany(Buffer.Company); Rec.Get(Buffer."No."); until Buffer.Next() = 0` when `Buffer` is not ordered by company, or even when it is — if `ChangeCompany` still runs every row. The signal is `ChangeCompany` inside `repeat`/`while` keyed by a document line rather than by a company loop.
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See sample: [`changecompany-in-loop-drops-caches.bad.al`](changecompany-in-loop-drops-caches.bad.al).
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