46 lines
1.3 KiB
TypeScript
46 lines
1.3 KiB
TypeScript
import {
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getDoc,
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getDocs,
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onSnapshot,
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Query,
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DocumentReference,
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} from 'firebase/firestore'
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export const getValue = async <T>(doc: DocumentReference) => {
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const snap = await getDoc(doc)
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return snap.exists() ? (snap.data() as T) : null
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}
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export const getValues = async <T>(query: Query) => {
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const snap = await getDocs(query)
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return snap.docs.map((doc) => doc.data() as T)
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}
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export function listenForValue<T>(
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docRef: DocumentReference,
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setValue: (value: T | null) => void
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) {
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// Exclude cached snapshots so we only trigger on fresh data.
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// includeMetadataChanges ensures listener is called even when server data is the same as cached data.
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return onSnapshot(docRef, { includeMetadataChanges: true }, (snapshot) => {
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if (snapshot.metadata.fromCache) return
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const value = snapshot.exists() ? (snapshot.data() as T) : null
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setValue(value)
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})
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}
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export function listenForValues<T>(
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query: Query,
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setValues: (values: T[]) => void
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) {
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// Exclude cached snapshots so we only trigger on fresh data.
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// includeMetadataChanges ensures listener is called even when server data is the same as cached data.
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return onSnapshot(query, { includeMetadataChanges: true }, (snapshot) => {
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if (snapshot.metadata.fromCache) return
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const values = snapshot.docs.map((doc) => doc.data() as T)
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setValues(values)
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})
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}
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