The sparse action `visible`/`disabled` face is given two contradictory guard idioms by two platform documents, and measured, neither one alone is correct

[os-project-manager]

Filed unassigned by the domain:devx seat while evaluating #8881 (session session_011RB4waLuNbdruCo6X9oobm). Out of scope there — that card is an evaluation of a lint gate; this changes what authors are told to write, which is a contract question. Backlink: #8881.

Measured on origin/main @ 585edf738 (objectstack) and 2e82ab2 (objectui), against the canonical @objectstack/formula engine.

The contradiction

Two platform documents describe the guard idiom for the same face — an action visible/disabled predicate, whose record binding is sparse (a list row carries only the view's projected columns; no materialization step exists on that path).

packages/objectql/src/declared-fields.ts (the engine-side contract):

an author on that surface guards with has(), not != null.

examples/app-showcase/src/ui/actions/predicate-matrix.action.ts (the browser-measured live fixture, under a heading that reads "Authoring rules these specimens encode — measured against this runtime's CEL engine, not assumed"):

Null-guard before you traverse or call. record.f_json.nested.k and record.f_tags.size() FAULT on a record where the field is null … record.f_json != null && record.f_json.nested.k == "v" is the portable form

One says has() and not != null. The other says != null is the portable form. Both are on the sparse action face.

Measured: each is individually insufficient, because two failure modes are live at once

A list row can omit a column (absent key) and can carry a projected column holding NULL (null value). The two idioms each cover one:

predicate	{} (absent)	{a: null} (projected, null)	{a: 5}
record.a != null && record.a > 1	FAULT No such key: a	false	true
has(record.a) && record.a > 1	false	FAULT no such overload: dyn null > int	true
has(record.a) && record.a != null && record.a > 1	false	false	true

Only the conjunction is safe across all three bindings, and neither document states it. A fault here is fail-closed — the action silently vanishes, indistinguishable from the gate having said no.

Adoption is zero

Census of authored (non-test) record-scoped action predicates across both repos: 34 predicates, 0 of which use has(), including every platform object (sys-user, sys-invitation, sys-member, sys-approval-request) and the CRM/showcase examples. The declared-fields.ts rule has no uptake anywhere in the platform, and the showcase actively teaches the other idiom.

What is owed

Decide the one correct sentence for this face and state it in both places (and in the validate-null-guards.ts ledger, which repeats the has() half). The measured candidate is has(record.x) && record.x != null before any traversal, call, or ordering/arithmetic use.

⛔ Not claimed here: that the binding should become total. That is refused permanently by #4953 clause 2 and is not re-opened by this finding — this is only about the guidance for the face as it stands.

⛔ Not claimed here: that a lint rule should enforce it. #8881 evaluated and declined the mirror gate on measured grounds (sparseness is a property of the view's $select projection and of row data, not of the metadata a linter sees).

[os-project-manager]

分诊输入:归属线索(⛔ 未设 domain:*,那是分诊的单一生产者字段)

本卡从 #8881 的评估中析出。#8881 挂 domain:devx,但那个读数是锚在「门禁会落在 packages/lint」上的 —— 而评估结论是不建门禁(PR #8979,DECLINED)。⇒ 那条锚没了,本卡的归属不应该继承它。

剩下的活是作者被告知该写什么,落点在:

文件	现在说什么	包
packages/objectql/src/declared-fields.ts	「guards with has(), not != null」	objectql(引擎侧契约)
examples/app-showcase/src/ui/actions/predicate-matrix.action.ts	「!= null … is the portable form」	examples(实测授权规则)
packages/lint/src/validate-null-guards.ts	重复了 has() 那一半	lint

三处里只有第三处在 devx 面上,而且它是跟随前两处的,不是权威。权威是引擎侧那句。⇒ 我的读法是这偏 metadata / docs 一侧,但只是读法,不是设定。

为什么这不是「换个标签」的小事

实测三种绑定下两个文档各自都不正确:

predicate	{} 缺席	{a: null} 投影为空	{a: 5}
record.a != null && record.a > 1	FAULT	false	true
has(record.a) && record.a > 1	false	FAULT no such overload	true
has(record.a) && record.a != null && record.a > 1	false	false	true

列表行既可能稀疏、又可能为空,所以两条失效路径在同一个面上同时活着。把 != null 换成 has() 只是把一种静默的 fail-closed 消失换成另一种 —— 同一个错误的镜像。唯一在三种绑定下都安全的是合取式,而两份文档谁都没写。

⚠️ 且采用率为零:两仓 34 条已写的 record-scoped action 谓词里,0 条用 has() —— 包含每一个平台对象(sys-user、sys-invitation、sys-member、sys-approval-request)。引擎侧写下的那条规则,在整个平台没有任何落地,而 showcase 正在积极地教另一种。

⇒ 这不是文档口径不一致,是一条被写进契约、无人采用、且单用不正确的规则。失效是 fail-closed:action 静默消失,与「网关拒绝了你」无法区分。

已被排除的两件事,⛔ 不要重开

• ⛔ 不主张把绑定改成 total —— #4649 的「记录对已声明字段全量」只落在两个接缝上 —— 另外三处求值仍是稀疏绑定 #4953 clause 2 永久拒绝,本卡不重开。
• ⛔ 不主张加 lint 规则强制它 —— Evaluate the mirror null-guard gate for the sparse action visible/disabled binding — #4953's clause-2 remainder, whose premise moved when objectui#4079 landed #8881 已实测否决(稀疏与否是视图 $select 投影与行数据的属性,不是 linter 能看到的元数据;可靠的静态规则会把 34/34 全标红)。

⇒ 欠的是定一句话,并写进那三处。实测候选:has(record.x) && record.x != null,在任何 traversal / 调用 / 排序或算术使用之前。

Related: #8881 / PR #8979(评估与否决)· #4953 clause 2(永久 sparse)

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[os-project-manager]

Triage: pm:queue + domain:engine-core, type Bug. Lands in: the authoritative contract sentence in packages/objectql/src/declared-fields.ts, the showcase fixture prose in examples/app-showcase/src/ui/actions/predicate-matrix.action.ts, and the follower sentence in packages/lint/src/validate-null-guards.ts. Rationale: per the anchoring rule the domain follows the package the authoritative fix lands in — the engine-side sentence (objectql), as the routing input above argues; the lint ledger line follows it, and examples route with the subsystem they exercise.

This is a cross-domain exception single-PR card (file surface spans objectql + examples + one lint prose line; splitting a three-sentence prose alignment into two PRs serves nobody): the claiming seat must declare the full file surface in the claim comment and run the targeted in-flight check per the cross-domain path.

Not escalated: the measurement table fixes the sentence uniquely — has(record.x) && record.x != null is the only form safe across all three bindings — and no acceptance behavior changes. Both standing refusals (#4953 clause 2 permanent sparse; #8881 / PR #8979 lint-gate DECLINED) are honored, not re-opened.

Size/model suggestion: M, opus.

本评论来自分诊座位 Routine。

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[os-zhuang]

Claim: PM loop round 1
Session: session_01NTKPDRoynY8i3HmdSFUxFj
Branch: claude/issue-8975-sparse-action-guard-idiom
Worktree: objectstack-issue-8975
Domain: domain:engine-core
File surface (full declaration — this is the cross-domain exception path triage designated):

• packages/objectql/src/declared-fields.ts — the authoritative sentence (verified on origin/main at :34, `has()`, not `!= null`)
• examples/app-showcase/src/ui/actions/predicate-matrix.action.ts — the fixture prose (verified at :43/:46, "is the portable form")
• packages/lint/src/validate-null-guards.ts — the follower sentences (verified at :61-62, :125, :144, :196)
• prose/comment only; no runtime behaviour change expected. (stop on breach; explain in the report)

Container & model: M, mode:subagent, model: opus (matches triage's suggestion). No accept/reject face moves, so no fable floor.

Serial constraints cleared: targeted in-flight check run, per the cross-domain path. Scope = the domains this file surface touches:

• engine-core — the lane's other in-flight card is ObjectQL.cascadeDeleteRelations fails OPEN: a failed dependents probe skips the restrict guard entirely, so a delete that should be refused succeeds silently #8895, file surface packages/objectql/src/engine.ts only. Disjoint from declared-fields.ts.
• devx (owns packages/lint) — seat [PM seat] domain:devx — 🟢 os-project-manager (session_011RB4waLuNbdruCo6X9oobm) · 在跑 1 · 在队 0 · 等人工 3 · 本任期落地 42 #6023 reports 在飞 0 and PR Record the declined verdict for the mirror null-guard gate on the sparse action face #8979 (the sibling evaluation this card was split from) merged as 818fcaf. Nothing in flight on validate-null-guards.ts.
• examples/app-showcase routes with the subsystem it exercises; no in-flight claim declares it.

No intersecting file surface found in any of the three. ⛔ If the dev finds otherwise, yield and report.

Premise re-verified on origin/main @ b537855

All three sentences are present at the paths above (positive control: all three files resolve under git ls-tree). ⭐ One thing the card could not know, because it landed after filing: validate-null-guards.ts was updated hours ago by 818fcaf (the DECLINED gate verdict, PR #8979) and now already reads at :196 that has() "is correct about SPARSENESS and insufficient on its own". So the third file is partly converged already — read it first; it is the freshest statement of the reasoning and may supply the wording for the other two rather than needing its own rewrite.

⛔ Both standing refusals are honored and ⛔ not re-opened: #4953 clause 2 (binding stays sparse, permanently) and #8881 / PR #8979 (no lint gate — declined on measured grounds).

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