Field not deleted when using update

[Roberto Wesley Overdijk]

Are you submitting a bug report or a feature request?

Bug report.

What is the current behavior?

When using FormApi.change('someField', { someNested: 'object' }) after deleting an entry from the object final-form sets it to null instead of reming it.

  const { values } = useFormState<VenueForm>();
  const form = useForm<VenueForm>();

  /* ... */

  const removeRegion = (key: string) => {
    const newRegions = { ...values.regions };

    delete newRegions[key];

    // Will still submit the `regions` with the old key entry, with value null.
    form.change('regions', newRegions); 
  };

What is the expected behavior?

Delete the field. Don't set it to null.

[Roberto Wesley Overdijk]

I even tried writing my own mutator:

const overwrite = (
  [name, value]: any[],
  state: any,
  { changeValue }: any
) => changeValue(state, name, (): any[] => value);

But it just refuses to delete the key.

[Roberto Wesley Overdijk]

Cool.

[bodo22]

@RWOverdijk Did you ever find a fix / workaround for this?

[Roberto Wesley Overdijk]

Yeah. I built my own library. 😄

Sorry I can't be of more help.