a9f3c50863
The previous LLM-generated knowledge files contained factual
hallucinations. The most visible was the claim that `FindFirst` /
`FindLast` "forces a full-table scan" on an unfiltered record - it does
not; those APIs return a single row via the current key.
Other inaccuracies the audit found and fixed:
* `FindSet(true)` was described as "taking a LockTable". The correct
upstream phrasing is that `FindSet(true)` sets
`ReadIsolation::UpdLock` on the read. UpdLock and LockTable are
related but distinct mechanisms.
* The list of production-scale tables had been invented beyond the
upstream source (e.g. "Detailed Cust. Ledg. Entry") without a
citation. The regenerated list matches the ten tables upstream lists
with their P95 row counts.
* `SetLoadFields` guidance had been augmented with an extra mechanism
claim ("the database resolves the filter using the index without
hydrating the value") not present in upstream.
Approach: full regeneration of `microsoft/knowledge/` from the six
upstream BCApps Code Review instruction files, with Microsoft Learn /
the AL language reference as a secondary source. Every claim in every
regenerated file is anchored to a verbatim upstream quote (or a Learn
URL); the audit trail lives in artifacts/trace-<domain>.json on the
session workspace.
The PR #11 transaction/error-handling cluster is preserved verbatim:
* performance/understand-implicit-transaction-boundary.md
* performance/codeunit-run-as-atomic-sub-operation.{md,good.al,bad.al}
* performance/codeunit-run-requires-prior-commit-inside-transaction.{md,good.al,bad.al}
* performance/use-tryfunction-for-error-catching-not-rollback.{md,good.al,bad.al}
* performance/avoid-commit-inside-loops.{md,good.al,bad.al}
* security/commitbehavior-attribute-scopes-explicit-commits.{md,good.al,bad.al}
* testing/transactionmodel-attribute-governs-test-transactions.{md,good.al,bad.al}
These articles already cite Microsoft Learn and were carefully
cross-referenced; the regeneration skips their topics rather than
duplicating them.
File counts after regeneration:
performance 35 .md (5 preserved + 30 new)
privacy 17 .md
security 18 .md (1 preserved + 17 new)
style 33 .md
testing 1 .md (preserved)
ui 19 .md
upgrade 18 .md
Total 141 atomic knowledge files, each strictly one rule. All pass
.github/scripts/validate_frontmatter.py with 0 errors and 0 warnings.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
1.5 KiB
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Do not Get the record the page already loaded
Description
A list or card page's OnAfterGetRecord trigger fires because the platform has already fetched a row into Rec. Calling Get for that same row inside the trigger repeats the read the platform just did. Per the upstream guidance, this is "redundant — record already fetched by page runtime"; the correction is "use Rec directly — already loaded." The waste compounds on list pages, where the trigger runs once per row displayed.
Best Practice
Inside page triggers — OnAfterGetRecord, OnAfterGetCurrRecord, validation triggers — read from Rec (or the trigger's record parameter). The platform exposes the freshly loaded record there for exactly this purpose. Reach for Get only when the trigger needs a different record than the one being displayed.
See sample: avoid-redundant-get-when-record-already-loaded.good.al.
Anti Pattern
AssemblyLineRec.Get("Document Type", "Document No.", "Line No."); at the top of OnAfterGetRecord, when the trigger is on the Assembly Line page itself and Rec already holds that row. The pattern often appears when a helper that expects a record parameter is invoked from a page trigger and the author writes a Get to "freshen" Rec rather than passing Rec through.
See sample: avoid-redundant-get-when-record-already-loaded.bad.al.