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use setQueryData updater function for notes state update #4232

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use setQueryData updater function for notes state update #4232

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7 changes: 4 additions & 3 deletions src/content/6/en/part6d.md
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Original file line number Diff line number Diff line change
Expand Up @@ -379,8 +379,9 @@ const App = () => {
mutationFn: createNote,
// highlight-start
onSuccess: (newNote) => {
const notes = queryClient.getQueryData(['notes'])
queryClient.setQueryData(['notes'], notes.concat(newNote))
queryClient.setQueryData(['notes'], (oldNotes) =>
oldNotes.concat(newNote)
)
// highlight-end
}
})
Expand All @@ -389,7 +390,7 @@ const App = () => {
}
```

That is, in the <i>onSuccess</i> callback, the <i>queryClient</i> object first reads the existing <i>notes</i> state of the query and updates it by adding a new note, which is obtained as a parameter of the callback function. The value of the parameter is the value returned by the function <i>createNote</i>, defined in the file <i>requests.js</i> as follows:
That is, in the <i>onSuccess</i> callback, the <i>queryClient</i> object updates the existing <i>notes</i> state of the query by using the previous state and adding the new note to it. The previous state of the query is provided as a parameter to the updater function, and the new note is obtained as a parameter of the callback function. The value of the parameter is the value returned by the function <i>createNote</i>, defined in the file <i>requests.js</i> as follows:

```js
export const createNote = async (newNote) => {
Expand Down