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2b5550c346
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
2.2 KiB
Markdown
28 lines
2.2 KiB
Markdown
---
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bc-version: [21..]
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domain: upgrade
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keywords: [datatransfer, validate-trigger, event-subscriber, side-effects, business-logic]
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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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# `DataTransfer` does not fire validation triggers or event subscribers
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## Description
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`DataTransfer` writes sets directly at the database layer, so row-based triggers and events do not run. For `CopyFields`, that includes the table `OnModify` trigger and `OnBeforeModifyEvent`/`OnAfterModifyEvent`; direct field assignment also does not call field `OnValidate` or its validation events. These are separate behaviors: `Record.Validate(Field, Value)` runs field validation, while `Record.Modify(true)` runs the table `OnModify` trigger. Calling `Modify(true)` does not retroactively validate assigned fields.
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For *new fields and tables added in the same change* this is fine: nothing yet depends on the validation. For *pre-existing fields with validation logic*, `DataTransfer` quietly bypasses business logic that may be load-bearing for posting, calculation, or integration scenarios.
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## Best Practice
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Use `DataTransfer` when set-based transfer is safe and row-level business logic is intentionally unnecessary — initial population of a new field is the canonical case. When an existing field's validation must run, loop through records and call `Validate(Field, Value)`; if the table's modify trigger must also run, follow with `Modify(true)`. If performance requires `DataTransfer`, document exactly which field-validation and row-modification triggers or subscribers are intentionally bypassed and verify that derived data remains correct.
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See sample: [`datatransfer-skips-triggers-and-subscribers.good.al`](datatransfer-skips-triggers-and-subscribers.good.al).
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## Anti Pattern
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Reaching for `DataTransfer` to update an existing field with non-trivial `OnValidate` or `OnModify` logic, without confirming that both validation and row-modification subscribers can be skipped. Replacing it with only `Modify(true)` is also incomplete when field validation is required; call `Validate` for that field first.
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See sample: [`datatransfer-skips-triggers-and-subscribers.bad.al`](datatransfer-skips-triggers-and-subscribers.bad.al).
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