TypeError: Cannot assign to read only property '0' of object '[object Array]'

[igorSurz]

Describe the bug

Please take a quick look on this code, I am struggling with this error, you can see my code for mutations that makes this query to refetch all records. And replace specific record I cant because of an error

queryClient.setQueryData(['boardData', currentBoardId, filterState], old => {
if (!old) return null;
const stateCopy = { ...old };

const foundIndex = stateCopy.records.findIndex(record => record.id === recordId);
const record = { ...stateCopy.records[foundIndex] };
if (foundIndex !== -1) {
	record.lastModified = Date.now();
	record.lastUserModified = data?.id;

	if (isNameEndpoint) {
		record.name = newValue;
	} else {
		const fieldToUpdate = fieldData.fieldId || fieldData.field;
		record[fieldToUpdate] = {
			value: newValue,
			meta: newMeta || null,
			brfId: fieldData?.id
		};
	}
       // stateCopy.records[foundIndex] = record <<<<--- Error

	const newRecords = [...stateCopy.records];
	newRecords[foundIndex] = record;
	stateCopy.records = newRecords;
}

return stateCopy;

Your minimal, reproducible example

...

Steps to reproduce

check the code snippet

Expected behavior

I thought that I was doing something like Object.freeze on my server side, but it is defiantly react query that freezes this array

How often does this bug happen?

Every time

Screenshots or Videos

No response

Platform

Chrome, React

Tanstack Query adapter

react-query

TanStack Query version

v5

TypeScript version

no

Additional context

No response

[TkDodo]

you're definitely not making immutable updates as the docs say that we should. you're making shallow copies, but then deeply assign values with code like timer.meta.recordName = newValue

query does not freeze anything. we use structural sharing to keep as many references as possible to avoid unnecessary re-renders and re-computations. If you mutate state directly

[igorSurz]

@TkDodo hello there, thank you for your answer and for your time, I did as immutable as possible, may I ask you to check if this is the right approach and I got you?

upd: after these changes, I am still getting rerender of all records.

	queryClient.setQueryData(['boardData', currentBoardId, filterState], old => {
		if (!old) return null;
		const stateCopy = { ...old };

		const foundIndex = stateCopy.records.findIndex(record => record.id === recordId);
		let record = { ...stateCopy.records[foundIndex] };
		if (foundIndex !== -1) {
			record = {
				...record,
				lastModified: Date.now(),
				lastUserModified: data?.id
			};

			if (isNameEndpoint) {
				record = {
					...record,
					name: newValue
				};

			
			} else {
				const fieldToUpdate = fieldData.fieldId || fieldData.field;
				record[fieldToUpdate] = {
					...record[fieldToUpdate],
					value: newValue,
					meta: newMeta || null,
					brfId: fieldData?.id
				};
			}

			const newRecords = [...stateCopy.records];
			newRecords[foundIndex] = record;
			stateCopy.records = newRecords;
		}