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 opened on 2023年11月3日

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help wanted

説明

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

コントリビューターガイド

技術スタック
reacttypescript
領域
frontend
Issue 種別
bug
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
3
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
1-3 hours
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
fresh
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
clear
前提条件
Understanding of React hooksFamiliarity with react admin form components
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
60
調査方針
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.