rjsf-team/react-jsonschema-form

if/then inside allOf blocks at different levels: No resolver found for key if

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#2927 opened on Jul 14, 2022

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 (5 comments) (7 reactions) (3 assignees)TypeScript (13,175 stars) (2,136 forks)batch import
any-one-all-ofbughelp wantedif-then-else

Description

Prerequisites

What theme are you using?

core

Version

4.2.0

Current Behavior

I have a schema that makes extensive use of if/then constructs (often inside allOf blocks). Unfortunately it does not work in rjsf and throws the following error in the console:

could not merge subschemas in allOf:
Error: No resolver found for key if. You can provide a resolver for this keyword in the options, or provide a default resolver.

I have prepared a shortened example of the problematic schema: catalog.txt

Using it in https://rjsf-team.github.io/react-jsonschema-form/ reproduces the issue.

When any of the two allOf blocks is deleted, the schema starts to work just fine.

I think it might be related to #2752 .

Expected Behavior

I would like rjsf to properly render the schema.

Steps To Reproduce

  1. Have a schema with if's inside allOf blocks at different levels in the schema
  2. Try to render it
  3. Observe that it doesnt work and throws an error

Environment

irrelevant (I guess)

Anything else?

No response

Contributor guide

Tech stack
typescriptreact
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.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Familiarity with ReactUnderstanding of JSON Schema if/then/allOfKnowledge of rjsf internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
The error occurs when merging allOf schemas that contain if/then blocks at different nesting levels. The console shows 'No resolver found for key if'. Investigate the schema merging logic in the utils module, likely in `src/utils.js` or similar. Look at how subschemas in allOf are merged and whether the `if` keyword is handled recursively. The issue references #2752, which may provide context. Check if the problem is in the `resolveDependencies` or `mergeAllOf` functions. The fix may require handling the `if` keyword during allOf merging or providing a resolver for it in the options.