Next.js Form Submission - Handling Nested State and API Responses
Hey everyone, I'm running into an issue that's driving me crazy. Hey everyone, I'm running into an issue that's driving me crazy. I'm working on a personal project and I'm working on a form in a Next.js application using React Hook Form and I'm working with issues with handling nested state updates after submitting my form. The form structure has multiple fields, including arrays of options that can be dynamically added or removed. After submitting, I'm trying to process the response from my API, but I'm not able to update the nested fields correctly based on the returned data. Here’s a simplified version of my form setup: ```javascript import { useForm, useFieldArray } from 'react-hook-form'; function MyForm() { const { register, control, handleSubmit, reset } = useForm(); const { fields, append, remove } = useFieldArray({ name: 'items', control }); const onSubmit = async (data) => { const response = await fetch('/api/submit', { method: 'POST', body: JSON.stringify(data), headers: { 'Content-Type': 'application/json' }, }); const result = await response.json(); // Here I want to reset the form with response data that may have nested structure reset(result); }; return ( <form onSubmit={handleSubmit(onSubmit)}> {fields.map((item, index) => ( <div key={item.id}> <input {...register(`items.${index}.name`)} defaultValue={item.name} /> <button type="button" onClick={() => remove(index)}>Remove</button> </div> ))} <button type="button" onClick={() => append({ name: '' })}>Add Item</button> <input type="submit" /> </form> ); } ``` When I call `reset(result);`, I get the following behavior message: `want to read properties of undefined (reading '0')`. It seems like my `result` object is not structured the same way as my form data. I've tried logging the `result` to see its structure, and it looks like this: ```json { "items": [{ "name": "Item 1" }, { "name": "Item 2" }] } ``` I suspect that Next.js might not be handling the nested object structure correctly when resetting the form. Is there a way to ensure that the form resets correctly with the nested data structure? What are some best practices for dealing with nested forms and API responses in React Hook Form within a Next.js context? I'm working on a service that needs to handle this. How would you solve this? My development environment is Windows. Any ideas what could be causing this? Any ideas what could be causing this? How would you solve this?