setValue can not update array data when its has defaultvalue.

[tonyYo00]

Describe the bug
A clear and concise description of what the bug is.
setValue can not update array data when its has defaultvalue. its also happen in useFieldArray ,when remove row, [object] will lost

To Reproduce
Steps to reproduce the behavior:

Codesandbox link (Required)
Include a codesandbox will help us to investigate the issue quicker.

https://codesandbox.io/s/controlled-field-array-forked-xjfl9?file=/src/App.tsx

just click submit and see the log.

• Browser [browser,]
• Version [7.88]

[tonyYo00]

[bluebill1049]

we don't support undefined for defaultValues.

[tonyYo00]

ok. i update the defaultValue, but it still has error .https://codesandbox.io/s/controlled-field-array-forked-xjfl9?file=/src/App.tsx

[bluebill1049]

I will take a look at this tmr.

[bluebill1049]

what's the steps to reproduce the issue in your CSB?

[tonyYo00]

whats mean CSB?

[bluebill1049]

codesandbox?

[bluebill1049]

problem

https://react-hook-form.com/api/useform

const { handleSubmit, setValue, control, register } = useForm<FormValues>({
  defaultValues: {
    test: [{ test: new Date() }]
  }
});

because you don't really have a test input, and react hook form will register the above defaultValues into

test.0.test

and when you try to update the input with setValue('test') the update is getting lost, so to work around this issue.

solutions

have a custom register or use controller

register('test')

or https://react-hook-form.com/api/usefieldarray