I'm creating an application where users can create and share notes.
To share each other's notes users have to send requests to specific users.
The requests are fetched whenever home is loaded.
However, requests is a context since it is also consumed in the toolbar and requests page to show the presence of the requests
When I'm using setRequsts
method of the context to set all the requests after home loads, the fetch goes into an infinite loop of /note
and /me
URLs, since the setRequests
method is also provided in the dependency array of useEffect
When removed, useEffect
show missing dependencies. What's the work around?
const {setRequests } = useContext(RequestsContext)
const [notes, setNotes] = useState([])
const [fetched, setFetched] = useState('')
const { isAuthenticated } = props
const {page}=useContext(PageContext)
const [sortBy,setSortBy]=useState('latest')
useEffect(() => {
const fetch = async () => {
try {
let url = 'http://192.168.56.1:5000/api/v1/note', p, sort
if (page) p = `?page=${page}&limit=12`
if (sortBy === 'latest') {
sort=''
} else if (sortBy === 'most_liked') {
sort='&sort=likes'
}
const res = await Axios.get(url+p+sort)
setNotes(res.data.data)
if (res.data.data.length > 0) {
setFetched('Y')
} else {
setFetched('N')
}
} catch (err) {
console.log(err)
} finally {
if (isAuthenticated) {
const fetch = async () => {
const res = await axios.get(`user/me`)
if (res.data.data.createdPosts.length > 0) {
const arr = res.data.data.createdPosts.map(el => el.request)
console.log(arr)
setRequests(arr)
}
}
fetch()
}
}
}
fetch()
}, [isAuthenticated, /* setRequests, */ page, sortBy])
The problem is that the context provides a technically different setRequests
function on each render (that have a different address). This causes useEffect
to fire on each render.
To work around this, you could wrap setRequests
in a useCallback()
hook, like so:
// ...
const wrappedSetRequests = useCallback(setRequests, []);
// ...
useEffect(() => {
// do your stuff using 'wrappedSetRequests' instead of setRequests.
}, [ wrappedSetRequests /*...*/ ]);