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27 lines
1.3 KiB
Markdown
27 lines
1.3 KiB
Markdown
---
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bc-version: [all]
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domain: performance
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keywords: [report, addloadfields, ondatapreitem, layout, partial-record]
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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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# Use AddLoadFields in report dataitems
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> Contributions welcome — open a PR to refine or extend this article.
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## Description
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Reports iterate a dataitem's record automatically; the developer does not control the Find call directly. AddLoadFields, called in OnPreDataItem, tells the platform which fields the layout and the dataitem triggers will read. Without it the report streams every field of every row — for a ledger-entry dataitem on a production tenant, that is the dominant cost of the report.
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## Best Practice
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In each dataitem's OnPreDataItem trigger, call AddLoadFields for every field used by the layout, by the dataitem's triggers, and by any code that runs in the row-level event hooks. If the layout uses a FlowField, also ensure CalcFields is called and that the underlying key is loaded (see add-sift-keys-for-flowfields).
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See sample: `use-addloadfields-in-report-layouts.good.al`.
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## Anti Pattern
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Omitting AddLoadFields is the default for reports generated by the AL wizard. For a dataitem backed by a ledger-entry table, this silently turns the report into a full-column scan.
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