marmelab/react-admin

UseWatch with an input field that has a default value returns undefined when the input field is not changed

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#9.419 geöffnet am 3. Nov. 2023

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help wanted

Beschreibung

What you were expecting: I would expect that useWatch returns the default value of the field.

What happened instead: useWatch returns undefined, untill I change the watched field.

Steps to reproduce:

create a form with an input that has a default value, then have another component use useWatch on that input field, the resulting value is undefined untill you change the input.

Related code: I created a WatchBug component in the PostCreate file. It watches the Published at input. you see that initally the value returned is undefined. https://stackblitz.com/edit/github-mjvobu?file=src%2Fposts%2FPostCreate.tsx

Environment

  • React-admin version: 4.15.2
  • Last version that did not exhibit the issue (if applicable): 4.8.4 does not show the bug, I did not try other versions inbetween.

Working version on 4.8.4 https://stackblitz.com/edit/github-ladv9x?file=src%2Fposts%2FPostCreate.tsx

Contributor Guide

Tech Stack
reacttypescript
Domain
frontend
Issue Type
bug
SchwierigkeitGeschätzte Implementierungsschwierigkeit für neue Contributors, von 1 für sehr kleine Änderungen bis 5 für Expertenarbeit.
3
Geschätzte ZeitEin grober Zeitrahmen, um zu recherchieren, zu implementieren, zu testen und einen Pull Request vorzubereiten.
1-3 hours
AktivitätsstatusWie verfügbar das Issue gerade wirkt: frisch, aktiv, stale, blockiert oder wartet auf Maintainer-Input.
fresh
KlarheitWie klar das Issue die erwartete Änderung, Akzeptanzkriterien und den nächsten Schritt erklärt.
clear
Voraussetzungen
Understanding of React hooksFamiliarity with react admin form components
EinsteigerfreundlichkeitEin Score von 1 bis 100, der schätzt, wie zugänglich dieses Issue für First-Time Contributors ist.
60
Research-Richtung
Reproduce the bug using the provided StackBlitz links (version 4.15.2 with bug, 4.8.4 without). Focus on the useWatch hook in src/posts/PostCreate.tsx. Compare the hook implementations between versions to identify the breaking change. The issue likely lies in how useWatch handles default values for fields. Check the react admin source code for useWatch to see if the default value propagation changed.