React hook form useEffect 不会通过调用另一个组件来重新渲染功能组件

Question

I'm trying to do aa react form using react-hook-forms, but I'm having trouble presenting data retrieved from an API call.

I've sort of combined this example , which deals with asynchronously setting form values, and this example , which deals with nested arrays.

But for the life of me, I simply could not get it to work. The JSON output of the API is something like this:

{"daily": { "last_received_date": "2020-08-03 11:04:18 UTC+8", "tasks": [
  { "id": "1", "freq": "d", "prog": 0, "max": 5, "reward": 1000 },
  { "id": "2", "freq": "d", "prog": 0, "max": 1, "reward": 1000 },
  { "id": "3", "freq": "d", "prog": 0, "max": 3, "reward": 1000 }]}, 
 "weekly": {/*Similar to daily*/}}

Here's the functional component:

const UserTaskForm = (data) => {
    const [TaskId, setTaskId] = useState();
    const [TaskArray, setChallengeArray] = useState([]);
    const { register, control, handleSubmit, getValues, reset, errors } = useForm();
    const onSubmit = (formData) => {console.log(formData);};

    useEffect(() => {
        async function fetchData() {
            try {
                let result = await dbGetUserTasks(data.userId);
                console.log(result);
                const tempArray = [];
                const formData = JSON.parse(result[0].challenges);
                tempArray.push(formData.daily);
                tempArray.push(formData.weekly);
                setTaskId(JSON.parse(result[0].id));
                setChallengeArray(tempArray);
            } catch (error) { console.error(error); }
        }

        fetchData();
    }, []);

    return (
        <form onSubmit={handleSubmit(onSubmit)}>
            <Box paddingTop={2} paddingBottom={2}>
                <Button type="submit" style={{ marginLeft: "auto" }}>Save Changes</Button>
            </Box>
            {TaskArray ? <Spinner animation="border" /> : <TaskTypeCards{...{ control, register, TaskArray, getValues, errors }} />}            
        </form>     
    );
}

export default UserTaskForm;

And here's the functional component that calls:

export default function TaskTypeCards({ control, register, defaultValues, errors }) {
    console.log(defaultValues); // <--------------- Undefined.
    const { fields, append, remove } = useFieldArray({ control, name: "test" });

    useEffect(() => {
        console.log(defaultValues); // <--------------- Undefined.
    }, [defaultValues])

    return(
        {defaultValues.map((challenge, index) => {
            return (
                <Card>
                    Blah blah this doesn't work anyway
                </Card>
            )
        })}
    )
}

I understand that the components are rendered before the useEffect is fired in UserTaskForm , but how do I re-render it, such that defaultValues in TaskTypeCards don't log out an undefined ?

Answer 1

defaultValues need to be passed as the props, to receive it as props in the TaskTypeCards components.

Thanks