Feature: expanded FallbackField for object and array #4857
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Feature improvement for `FallbackField` to support object and array types - In `@rjsf/utils` removed `ADDITIONAL_PROPERTY_KEY_REMOVE` in favor of moving it to a local `core` `constants.ts` file - In `@rjsf/core` added `src/components/constants.ts` and refactored `ADDITIONAL_PROPERTY_KEY_REMOVE` and `IS_RESET` into it - Updated `Form` to get `ADDITIONAL_PROPERTY_KEY_REMOVE` and `IS_RESET` from the constants file - Updated `ObjectField` to get `ADDITIONAL_PROPERTY_KEY_REMOVE` from the constants file - Updated `FallbackField` to add `object` support (via additional properties) and `array` support - Updated `ArrayField` to handle missing `items` differently when the fallback field feature is on so that clicking the add button presents the fallback field UI - Updated the `CHANGELOG.md` accordingly
heath-freenome
commented
Nov 6, 2025
| * utility. | ||
| */ | ||
| export const ADDITIONAL_PROPERTY_FLAG = '__additional_property'; | ||
| export const ADDITIONAL_PROPERTY_KEY_REMOVE = Symbol('remove-this-key'); |
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I did this so that if someone just updated core they wouldn't have an issue with a missing constant
nickgros
approved these changes
Nov 7, 2025
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Reasons for making this change
Feature improvement for
FallbackFieldto support object and array types@rjsf/utilsremovedADDITIONAL_PROPERTY_KEY_REMOVEin favor of moving it to a localcoreconstants.tsfile@rjsf/coreaddedsrc/components/constants.tsand refactoredADDITIONAL_PROPERTY_KEY_REMOVEandIS_RESETinto itFormto getADDITIONAL_PROPERTY_KEY_REMOVEandIS_RESETfrom the constants fileObjectFieldto getADDITIONAL_PROPERTY_KEY_REMOVEfrom the constants fileFallbackFieldto addobjectsupport (via additional properties) andarraysupportArrayFieldto handle missingitemsdifferently when the fallback field feature is on so that clicking the add button presents the fallback field UICHANGELOG.mdaccordinglyChecklist
npx nx run-many --target=build --exclude=@rjsf/docs && npm run test:updateto update snapshots, if needed.fallback.mov