rjsf-team/react-jsonschema-form

default value not working when a schema item extends a definition ($ref )

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#3,335 opened on Jan 3, 2023

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$reffeaturehelp wanted

Description

Prerequisites

What theme are you using?

core

Version

https://rjsf-team.github.io/react-jsonschema-form/

Current Behavior

I've carefully read the JSON forms documentation and I've seen that JSON schema 2020-12 (AJV 8) can have an item defined using the $ref property, then extended by adding its props

"item":{
	"$ref": "#/$defs/mydefinition",
	"properties":{
		...more props
	}
}

But when testing my schema (I pasted it here) in your playground, it does not work; default values are not loaded, for instance I get :

Unsupported field schema for field root_selectors_playlist_title_path: Unknown field type undefined.

{
  "default": "head title"
}

Expected Behavior

Default values should be loaded correctly.

Steps To Reproduce

  1. Head to the playground
  2. Paste this JSON schema
  3. Check the rendered form

Environment

- OS:(web playground)
- Node:(web playground)
- npm:(web playground)

Anything else?

Thanks for your help !

Contributor guide

Tech stack
reacttypescript
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic knowledge of ReactJSON Schema understanding
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate how react jsonschema form processes default values when a schema item uses $ref to extend a definition. Look at the playground with the provided schema (pastebin link). Examine the form component's default value logic, specifically in the schema processing or form state initialization. The error 'Unknown field type undefined' suggests the field type is not resolved correctly. Check linked issues or comments for similar problems. There is 1 comment in the issue that may provide clues. Consider fixing the resolution of $ref combined with additional properties.