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Three related concerns, each proven by executable tests rather than recall. They were extracted from a real defect that shipped through a six-reviewer panel undetected, which is the admission test passing on behavior rather than on theory. owning-table-must-delete-dependents-in-ondelete AL has no cascading delete. What makes it missable is an asymmetry: the platform DOES keep references correct on rename via TableRelation, so a developer who learns that and generalizes it to delete ships orphans. Also notes the permission trap (delete rights needed on the dependent table, not just the parent). validate-table-relation-false-suppresses-rename-propagation The non-obvious half. The property name implies input validation only, but disabling it also switches off rename propagation. Verified against a parent renamed once while a child held three fields: a normal relation (follows), the same relation with validation disabled (does NOT follow), and a field with no relation at all (does not follow) — the third being the control that proves the test can detect a non-propagating field. xrec-is-a-before-image-only-in-some-triggers Corrects both the naive belief that xRec is always the previous record and the folk rule that it 'only works from a page'. The behavior is per-trigger: a genuine before-image in OnRename and OnDelete regardless of driver, a mirror of Rec in OnInsert/OnModify when driven from code, and a real before-image in those two only when a page drove the write. That last asymmetry is why an OnModify comparison against xRec passes manual page testing and silently no-ops in a job queue. Targets /community per CONTRIBUTING — general BC knowledge, not fork-specific. Frontmatter validator clean; Test-ReviewFixtures passes (32 cases, 16 leaves).
55 lines
1.1 KiB
AL
55 lines
1.1 KiB
AL
table 50100 "Order Header"
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{
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// The owning table needs delete rights on what it owns. Granting D only on the
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// header is a common miss and makes OnDelete fail for a non-SUPER user.
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Permissions = tabledata "Order Line" = rd;
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fields
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{
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field(1; "Entry No."; Integer)
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{
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DataClassification = CustomerContent;
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}
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}
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keys
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{
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key(PK; "Entry No.")
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{
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Clustered = true;
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}
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}
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trigger OnDelete()
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var
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OrderLine: Record "Order Line";
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begin
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OrderLine.SetRange("Header Entry No.", "Entry No.");
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// Pass false only when Order Line has no OnDelete of its own.
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OrderLine.DeleteAll(true);
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end;
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}
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table 50101 "Order Line"
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{
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fields
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{
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field(1; "Line No."; Integer)
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{
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DataClassification = CustomerContent;
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}
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field(2; "Header Entry No."; Integer)
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{
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DataClassification = CustomerContent;
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TableRelation = "Order Header"."Entry No.";
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}
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}
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keys
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{
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key(PK; "Line No.")
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{
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Clustered = true;
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}
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}
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}
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