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feat(14.2.1-06): hydrate relation-child update and show ML maps

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UpdateChild and ShowChild now lift, apply, and hydrate nested locales the same way as host CRUD, so a child form keeps English on the column and Polish through the writer.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Jakub Zych
2026-10-06 15:53:24 +02:00
parent 88a3a88876
commit 4e37d877f1
4 changed files with 49 additions and 6 deletions
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docs/backend/forms.md
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@@ -345,7 +345,7 @@ fields:
tab: acme.blog::lang.posts.tab_content
```
A save of `{ "title": { "en": "Hello", "pl": "Witaj" } }` lifts the nested map before `cabana.ProjectWritableFields` drops nested values. The default locale fills the host column; other locales are written through a published `cabana.TranslationWriter` after the host row has a primary key, still inside the controller's permissioned save transaction. The default locale is not duplicated into the translation store. Show and save then run `hydrateMLRecord`: each declared ML field in the record payload is a map of every enabled locale (default from the host column, others from `TranslationWriter.TranslatedExact`; a missing non-default code is an empty string, never D-11 fallback). A non-string value, an undeclared locale, a missing default locale, or a nested map on a field that is not declared multilingual is a 422 on that field. Generic nested objects on other field types are still dropped. Cabana never imports a translate plugin and never exposes a public translate-write or translate-read route: if no writer is published, a nested ML map is a 422.
A save of `{ "title": { "en": "Hello", "pl": "Witaj" } }` lifts the nested map before `cabana.ProjectWritableFields` drops nested values. The default locale fills the host column; other locales are written through a published `cabana.TranslationWriter` after the host row has a primary key, still inside the controller's permissioned save transaction. The default locale is not duplicated into the translation store. Relation-child create and update on `cabana.RelationService` use the same lift and apply path as controller save; child show hydrates through `hydrateMLRecord` like a host GET. Show and save then run `hydrateMLRecord`: each declared ML field in the record payload is a map of every enabled locale (default from the host column, others from `TranslationWriter.TranslatedExact`; a missing non-default code is an empty string, never D-11 fallback). A non-string value, an undeclared locale, a missing default locale, or a nested map on a field that is not declared multilingual is a 422 on that field. Generic nested objects on other field types are still dropped. Cabana never imports a translate plugin and never exposes a public translate-write or translate-read route: if no writer is published, a nested ML map is a 422.
## What a save may write