Created
November 3, 2022 19:24
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dumb relay data fetching hook
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| import { fetchQuery, useRelayEnvironment } from 'react-relay' | |
| import { useEffect, useState } from 'react' | |
| interface ArgsInterface { | |
| numResults: number | |
| pollingInterval: number | |
| } | |
| export function useSomeRelayQuery({ numResults, pollingInterval }: ArgsInterface): { | |
| data: SomeTypeQuery$data | null | |
| loading: boolean | |
| error: Error | null | |
| } { | |
| const [data, setData] = useState<SomeTypeQuery$data | null>(null) | |
| const [loading, setLoading] = useState(false) | |
| const [error, setError] = useState<Error | null>(null) | |
| const [reload, setReload] = useState(false) | |
| useEffect(() => { | |
| const interval = setInterval(() => setReload(true), pollingInterval) | |
| return () => clearInterval(interval) | |
| }) | |
| const environment = useRelayEnvironment() | |
| useEffect(() => { | |
| if (!reload) { | |
| return | |
| } | |
| const subscription = fetchQuery<SomeTypeQuery>(environment, query, { numResults }).subscribe({ | |
| start() { | |
| setReload(false) | |
| setError(null) | |
| setLoading(true) | |
| }, | |
| next(newData) { | |
| setData(newData) | |
| }, | |
| error(e: Error) { | |
| setError(e) | |
| }, | |
| complete() { | |
| setLoading(false) | |
| }, | |
| }) | |
| return () => subscription.unsubscribe() | |
| }, [environment, numResults, reload]) | |
| return { data, error, loading } | |
| } |
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