objectstack-ai
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diff --git a/‎content/docs/references/data/object.mdx‎
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@@ -0,0 +1,111 @@
+---
+"@objectstack/spec": minor
+"@objectstack/driver-sql": minor
+---
+
+fix(spec)!: `multiple: true` is refused on every type outside the multi-capable set, and driver-sql derives JSON-column storage from the spec predicate (#17469)
+
+<!-- adr-0087: registered field-multiple-non-capable-type-refused -->
+
+**BREAKING** in the accept-set sense, landing in the launch window as `minor`
+(the lockstep convention: `major` is refused by `check-changeset-no-major`, and
+breaking-ness is carried by this banner plus the ADR-0087 disposition).
+
+Two definitions of "multi-valued" disagreed, and the user saw the disagreement as
+a `400`.
+
+- `FieldSchema` accepted `multiple: true` on **any** type.
+- `@objectstack/driver-sql`'s `isJsonField` read the flag raw —
+  `JSON_COLUMN_TYPES.has(type) || !!field.multiple` — and built a **JSON array
+  column** for it.
+- `isMultiValueField` — the published spec predicate consumers shape queries from
+  — answered **"not multi-value"** for that same field, because `master_detail` /
+  `tree` / `text` are outside `MULTI_CAPABLE_TYPES`.
+
+So a related list composed `=` against a JSON array column, and the driver refused
+the equality family there with a `400`.
+
+In business terms: `multiple` means "this cell holds several values at once", and
+that has meaning only on multi-select, multi-record / multi-user and multi-file
+fields — exactly what the spec already declares. A child record with several
+masters, a tree node with several parents, or a text box holding several texts has
+no meaning on any mainstream platform. The declaration was accepted silently, the
+UI rendered a single value, the database built a JSON array column, and the
+related list answered the user a 400.
+
+FROM → TO, for metadata that used to parse and now fails:
+
+```ts
+// FROM — parsed, stored a JSON array, rendered single, answered `=` with 400
+{ type: 'text',          label: 'Aliases',  multiple: true }
+{ type: 'master_detail', label: 'Parents',  reference: 'account', multiple: true }
+{ type: 'tree',          label: 'Parents',  reference: 'category', multiple: true }
+
+// TO — pick the type that actually holds several values…
+{ type: 'tags',   label: 'Aliases' }                                   // several free-form strings
+{ type: 'lookup', label: 'Parents', reference: 'account', multiple: true }  // several related records
+
+// …or drop the key, if the cell really holds one value.
+{ type: 'text',          label: 'Alias' }
+{ type: 'master_detail', label: 'Parent', reference: 'account' }
+```
+
+The refusal names the field, its type and the alternative, on the `multiple` path.
+`radio` keeps its own narrower 2026-08-22 message (#11437); the two never
+double-fire.
+
+**`MULTI_CAPABLE_TYPES` and `isMultiValueField` are untouched**, deliberately: a
+field that was already multi-valued by that predicate keeps its declaration, its
+storage and its read path byte-identically. What moved is which declarations can
+be newly authored, plus the storage decision for the shapes that are now refused.
+
+**Storage change (`@objectstack/driver-sql`)**: every site that asked
+`field.multiple` the question "is this value multi-valued" now asks
+`isMultiValueField` — **eighteen expressions across two files**, not one. The
+file's own header already called `JSON_COLUMN_TYPES` membership "owned by
+`@objectstack/spec`"; that sentence is now true for the `multiple` half too.
+
+- `sql-driver.ts` — the DDL writer (`createColumn`'s multi-value short-circuit),
+  the read-side deserializer (`isJsonField`, both limbs), the `varchar` width
+  mirror (`varcharColumnChars`), the cross-field comparison class
+  (`crossFieldComparisonClass`), the four scalar registries filled by BOTH
+  `registerObjectMetadata` and `registerExternalObject` (`mediaFields`,
+  `booleanFields`, `numericFields`, `numericValueFields`), and the two MySQL
+  temporal-widening candidate sets.
+- `schema-drift.ts` — the differ's `fieldHasColumn`, its `declaresJsonColumn`
+  disjunct and its `declaresArray` test, which #15771 bound to the writer's
+  predicate and which a pin test holds equal to it.
+
+Only one of those was named in the ruling; aligning it and leaving seventeen
+would have re-opened #11535 in reverse — the DDL writing a JSON column that the
+read-side deserializer no longer recognises. A column whose field is multi-valued
+by the spec predicate behaves exactly as before; the shapes that change are the
+ones the schema now refuses at the entrance.
+
+⛔ Three `field.multiple` reads are deliberately NOT aligned: the three that
+interpolate `', multiple'` into an `uncompilableFieldReferenceError` message.
+They echo what the author DECLARED back to them; they do not ask whether the
+value is multi-valued (the verdict there comes from `crossFieldComparisonClass`,
+which is aligned).
+
+⚠️ **Two consequences worth reading before you upgrade.**
+
+1. A **stored** field carrying `multiple: true` on a non-capable type has no
+   lossless conversion — its column was physically built as a JSON array. The
+   ADR-0087 semantic entry `field-multiple-non-capable-type-refused` emits the
+   structured TODO naming the object, field and type; migrating the data is the
+   author's judgment call, and the entry states how to prove it.
+2. `isMultiValueField` reads the **authorable** `FieldType` vocabulary. A driver
+   -internal column-type alias (`string` / `integer` / `int` / `float` — the
+   introspected-column spellings) is not a `FieldType`, so a hand-declared
+   external object that puts `multiple: true` on one of those no longer gets a
+   JSON column. Declare such a column as `object` or `array` (both are
+   `JSON_COLUMN_TYPES` members and unchanged), or as the authorable type it
+   really is.
+3. `multiple: true` on `boolean` / `toggle` / `number` / `currency` / `percent` /
+   `date` / `datetime` / `time` **ceases to be a supported shape end to end**, as
+   a consequence of the entrance refusal above. Such a column is no longer a JSON
+   column, so it is no longer excluded from the scalar read-coercion registries
+   and the declared-type text-operator gate (`isNonTextColumn`) applies to it: a
+   `$contains` against one answers the declared no-match rather than a JSON
+   membership test. Stored data in that shape is the ADR-0087 entry's subject.
@@ -60,7 +60,7 @@ const result = CurrencyConfigSchema.parse(data);
 | **required** | `boolean` | optional (default: `false`) | Write-time contract (ADR-0113): an insert must provide a non-null value, and an update may not null it out. On a multi-value lookup (`multiple: true`) required means NON-EMPTY array — an emptied required set fails validation loudly; `[]` does not satisfy it (maintainer ruling 2026-08-18). NOT a column constraint — the physical NOT NULL is a separate explicit opt-in (`storage.notNull`), so tightening this on a deployed object is safe: existing null rows stay readable, and editable as long as the write does not touch this field. |
 | **storage** | `{ notNull?: boolean }` | optional | Physical storage constraints (ADR-0113). Owns the DDL the write contract deliberately does not imply. Absent = no storage-level constraint requested. |
 | **searchable** | `boolean` | optional (default: `false`) | Is searchable |
-| **multiple** | `boolean` | optional (default: `false`) | Allow multiple values (Stores as Array/JSON). Applicable for select, lookup, file, image. An emptied multi-value lookup reads back as `[]`, never `null` — the rule binds every writer (cascade repair, form clears, API writes), not just cascade repair (maintainer ruling 2026-08-18). |
+| **multiple** | `boolean` | optional (default: `false`) | Allow multiple values (Stores as Array/JSON). Declarable ONLY on the multi-capable types — select, lookup, user, file, image — and redundantly on the inherently-multi option types (multiselect, checkboxes, tags); `multiple: true` on any other type is REFUSED at parse (maintainer ruling 2026-09-13), and on `radio` by the narrower 2026-08-22 ruling. An emptied multi-value lookup reads back as `[]`, never `null` — the rule binds every writer (cascade repair, form clears, API writes), not just cascade repair (maintainer ruling 2026-08-18). |
 | **unique** | `boolean \| 'global' \| 'organization'` | optional | Unique constraint and its scope (ADR-0120). 'organization' = one holder per organization (NULL-safe composite with the organization key part on organization-scoped objects) — prefer this explicit spelling in new code; true = same per-organization scope (positional synonym, stays valid); 'global' = one holder across the whole installation. 'tenant'/'org' are rejected — the word is 'organization'. Omitted ⇒ false, EXCEPT on an `autonumber` field, where omitted ⇒ 'organization' (an auto-number is a business identifier, so the platform makes it unique per organization by default — the same tenant-composite shape an explicit `unique: true` produces). To opt an autonumber field out, write `unique: false` explicitly — legitimate only for a display-only sequence that is not used to identify the record; the platform's duplicate scan (`os migrate duplicates`) still treats every autonumber field as an identifier. |
 | **defaultValue** | `any` | optional | Default applied on INSERT when the field is omitted or null (`''` is a real value, not absence). Three legal shapes, discriminated in the engine's own order: a CEL Expression envelope `{ dialect: 'cel', source: 'today()' }` (accepted structurally; result type is a runtime concern); a runtime TOKEN — `NOW()` on `datetime`/`date`/`time` only, `current_user` on `user` or `lookup` with `reference: 'sys_user'` only, neither on a multi-value field; or a LITERAL, which must satisfy this field's own stored value contract (ADR-0104 D1 `valueSchemaFor`). Anything else is refused at parse time with a prescriptive message. |
 | **maxLength** | `integer` | optional | Max character length (positive integer). Only authorable on types that store a bounded string: text, textarea, email, url, phone, password, markdown, html, richtext, code, signature, qrcode. Checked on the WRITTEN value only (the `min`/`max` transition-gate class): a stored value longer than a bound declared later is never re-read and survives unrelated edits — only a write carrying an over-long value is refused. |
 
@@ -222,7 +222,7 @@ const result = ApiMethod.parse(data);
 | **required** | `boolean` | optional (default: `false`) | Write-time contract (ADR-0113): an insert must provide a non-null value, and an update may not null it out. On a multi-value lookup (`multiple: true`) required means NON-EMPTY array — an emptied required set fails validation loudly; `[]` does not satisfy it (maintainer ruling 2026-08-18). NOT a column constraint — the physical NOT NULL is a separate explicit opt-in (`storage.notNull`), so tightening this on a deployed object is safe: existing null rows stay readable, and editable as long as the write does not touch this field. |
 | **storage** | `{ notNull?: boolean }` | optional | Physical storage constraints (ADR-0113). Owns the DDL the write contract deliberately does not imply. Absent = no storage-level constraint requested. |
 | **searchable** | `boolean` | optional (default: `false`) | Is searchable |
-| **multiple** | `boolean` | optional (default: `false`) | Allow multiple values (Stores as Array/JSON). Applicable for select, lookup, file, image. An emptied multi-value lookup reads back as `[]`, never `null` — the rule binds every writer (cascade repair, form clears, API writes), not just cascade repair (maintainer ruling 2026-08-18). |
+| **multiple** | `boolean` | optional (default: `false`) | Allow multiple values (Stores as Array/JSON). Declarable ONLY on the multi-capable types — select, lookup, user, file, image — and redundantly on the inherently-multi option types (multiselect, checkboxes, tags); `multiple: true` on any other type is REFUSED at parse (maintainer ruling 2026-09-13), and on `radio` by the narrower 2026-08-22 ruling. An emptied multi-value lookup reads back as `[]`, never `null` — the rule binds every writer (cascade repair, form clears, API writes), not just cascade repair (maintainer ruling 2026-08-18). |
 | **unique** | `boolean \| 'global' \| 'organization'` | optional | Unique constraint and its scope (ADR-0120). 'organization' = one holder per organization (NULL-safe composite with the organization key part on organization-scoped objects) — prefer this explicit spelling in new code; true = same per-organization scope (positional synonym, stays valid); 'global' = one holder across the whole installation. 'tenant'/'org' are rejected — the word is 'organization'. Omitted ⇒ false, EXCEPT on an `autonumber` field, where omitted ⇒ 'organization' (an auto-number is a business identifier, so the platform makes it unique per organization by default — the same tenant-composite shape an explicit `unique: true` produces). To opt an autonumber field out, write `unique: false` explicitly — legitimate only for a display-only sequence that is not used to identify the record; the platform's duplicate scan (`os migrate duplicates`) still treats every autonumber field as an identifier. |
 | **defaultValue** | `any` | optional | Default applied on INSERT when the field is omitted or null (`''` is a real value, not absence). Three legal shapes, discriminated in the engine's own order: a CEL Expression envelope `{ dialect: 'cel', source: 'today()' }` (accepted structurally; result type is a runtime concern); a runtime TOKEN — `NOW()` on `datetime`/`date`/`time` only, `current_user` on `user` or `lookup` with `reference: 'sys_user'` only, neither on a multi-value field; or a LITERAL, which must satisfy this field's own stored value contract (ADR-0104 D1 `valueSchemaFor`). Anything else is refused at parse time with a prescriptive message. |
 | **maxLength** | `integer` | optional | Max character length (positive integer). Only authorable on types that store a bounded string: text, textarea, email, url, phone, password, markdown, html, richtext, code, signature, qrcode. Checked on the WRITTEN value only (the `min`/`max` transition-gate class): a stored value longer than a bound declared later is never re-read and survives unrelated edits — only a write carrying an over-long value is refused. |
@@ -555,7 +555,7 @@ const result = ApiMethod.parse(data);
 | **required** | `boolean` | optional (default: `false`) | Write-time contract (ADR-0113): an insert must provide a non-null value, and an update may not null it out. On a multi-value lookup (`multiple: true`) required means NON-EMPTY array — an emptied required set fails validation loudly; `[]` does not satisfy it (maintainer ruling 2026-08-18). NOT a column constraint — the physical NOT NULL is a separate explicit opt-in (`storage.notNull`), so tightening this on a deployed object is safe: existing null rows stay readable, and editable as long as the write does not touch this field. |
 | **storage** | `{ notNull?: boolean }` | optional | Physical storage constraints (ADR-0113). Owns the DDL the write contract deliberately does not imply. Absent = no storage-level constraint requested. |
 | **searchable** | `boolean` | optional (default: `false`) | Is searchable |
-| **multiple** | `boolean` | optional (default: `false`) | Allow multiple values (Stores as Array/JSON). Applicable for select, lookup, file, image. An emptied multi-value lookup reads back as `[]`, never `null` — the rule binds every writer (cascade repair, form clears, API writes), not just cascade repair (maintainer ruling 2026-08-18). |
+| **multiple** | `boolean` | optional (default: `false`) | Allow multiple values (Stores as Array/JSON). Declarable ONLY on the multi-capable types — select, lookup, user, file, image — and redundantly on the inherently-multi option types (multiselect, checkboxes, tags); `multiple: true` on any other type is REFUSED at parse (maintainer ruling 2026-09-13), and on `radio` by the narrower 2026-08-22 ruling. An emptied multi-value lookup reads back as `[]`, never `null` — the rule binds every writer (cascade repair, form clears, API writes), not just cascade repair (maintainer ruling 2026-08-18). |
 | **unique** | `boolean \| 'global' \| 'organization'` | optional | Unique constraint and its scope (ADR-0120). 'organization' = one holder per organization (NULL-safe composite with the organization key part on organization-scoped objects) — prefer this explicit spelling in new code; true = same per-organization scope (positional synonym, stays valid); 'global' = one holder across the whole installation. 'tenant'/'org' are rejected — the word is 'organization'. Omitted ⇒ false, EXCEPT on an `autonumber` field, where omitted ⇒ 'organization' (an auto-number is a business identifier, so the platform makes it unique per organization by default — the same tenant-composite shape an explicit `unique: true` produces). To opt an autonumber field out, write `unique: false` explicitly — legitimate only for a display-only sequence that is not used to identify the record; the platform's duplicate scan (`os migrate duplicates`) still treats every autonumber field as an identifier. |
 | **defaultValue** | `any` | optional | Default applied on INSERT when the field is omitted or null (`''` is a real value, not absence). Three legal shapes, discriminated in the engine's own order: a CEL Expression envelope `{ dialect: 'cel', source: 'today()' }` (accepted structurally; result type is a runtime concern); a runtime TOKEN — `NOW()` on `datetime`/`date`/`time` only, `current_user` on `user` or `lookup` with `reference: 'sys_user'` only, neither on a multi-value field; or a LITERAL, which must satisfy this field's own stored value contract (ADR-0104 D1 `valueSchemaFor`). Anything else is refused at parse time with a prescriptive message. |
 | **maxLength** | `integer` | optional | Max character length (positive integer). Only authorable on types that store a bounded string: text, textarea, email, url, phone, password, markdown, html, richtext, code, signature, qrcode. Checked on the WRITTEN value only (the `min`/`max` transition-gate class): a stored value longer than a bound declared later is never re-read and survives unrelated edits — only a write carrying an over-long value is refused. |