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db.js
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db.js
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import {
useQuery,
hashQueryKey,
QueryClient,
QueryClientProvider as QueryClientProviderBase,
} from 'react-query'
import {
getFirestore,
onSnapshot,
doc,
collection,
query,
where,
orderBy,
getDoc,
getDocs,
setDoc,
updateDoc,
addDoc,
deleteDoc,
serverTimestamp,
limit,
} from 'firebase/firestore'
import { firebaseApp } from './firebase'
// Initialize Firestore
const db = getFirestore(firebaseApp)
// React Query client
const client = new QueryClient()
/**** USERS ****/
// Subscribe to user data
// Note: This is called automatically in `auth.js` and data is merged into `auth.user`
export function useUser(uid) {
// Manage data fetching with React Query: https://react-query.tanstack.com/overview
return useQuery(
// Unique query key: https://react-query.tanstack.com/guides/query-keys
['user', { uid }],
// Query function that subscribes to data and auto-updates the query cache
createQuery(() => doc(db, 'users', uid)),
// Only call query function if we have a `uid`
{ enabled: !!uid },
)
}
// Fetch user data once (non-hook)
// Useful if you need to fetch data from outside of a component
export function getUser(uid) {
return getDoc(doc(db, 'users', uid)).then(format)
}
// Create a new user
export function createUser(uid, data) {
return setDoc(doc(db, 'users', uid), data, { merge: true })
}
// Update an existing user
export function updateUser(uid, data) {
return updateDoc(doc(db, 'users', uid), data)
}
/**** Collections ****/
export function useSchools() {
return useQuery(
['/Schools'],
createQuery(() =>
query(collection(db, '/Schools'), orderBy('school', 'asc')),
),
)
}
/**** ITEMS ****/
/* Example query functions (modify to your needs) */
// Subscribe to item data
export function useItem(id) {
return useQuery(
['item', { id }],
createQuery(() => doc(db, 'items', id)),
{ enabled: !!id },
)
}
export function useLearningPaths() {
return useQuery(
['/LearningPaths'],
createQuery(() => query(collection(db, '/LearningPaths'))),
)
}
export function useCourseByUID(uid) {
return useQuery(
['/Series', { uid }],
createQuery(() =>
query(
collection(db, '/Series'),
where('uid', '==', uid),
limit(1),
),
),
)
}
export function useCourses() {
return useQuery(
['/Series'],
// When fetching once there is no need to use `createQuery` to setup a subscription
// Just fetch normally using `getDoc` so that we return a promise
() => getDocs(collection(db, '/Series')).then(format),
)
}
export function useCoursePerCategory(categories) {
return useQuery(
['/Series', { categories }],
createQuery(
() =>
query(
collection(db, '/Series'),
where('category', 'array-contains-any', categories),
),
{ staleTime: 'Infinity' },
),
)
}
export function useCreators() {
return useQuery(
['/Artists'],
createQuery(() => query(collection(db, '/Artists'), limit(5))),
)
}
export function useCreatorsAll() {
return useQuery(
['/Artists'],
createQuery(() => query(collection(db, '/Artists'))),
)
}
export function useCategories() {
return useQuery(
['/Categories'],
createQuery(() => query(collection(db, '/Categories'))),
)
}
// Fetch item data once
export function useItemOnce(id) {
return useQuery(
['item', { id }],
// When fetching once there is no need to use `createQuery` to setup a subscription
// Just fetch normally using `getDoc` so that we return a promise
() => getDoc(doc(db, 'items', id)).then(format),
{ enabled: !!id },
)
}
// Subscribe to all items by owner
export function useItemsByOwner(owner) {
return useQuery(
['items', { owner }],
createQuery(() =>
query(
collection(db, 'items'),
where('owner', '==', owner),
orderBy('createdAt', 'desc'),
),
),
{ enabled: !!owner },
)
}
// Create a new item
export function createItem(data) {
return addDoc(collection(db, 'items'), {
...data,
createdAt: serverTimestamp(),
})
}
// Update an item
export function updateItem(id, data) {
return updateDoc(doc(db, 'items', id), data)
}
// Delete an item
export function deleteItem(id) {
return deleteDoc(doc(db, 'items', id))
}
/**** HELPERS ****/
// Store Firestore unsubscribe functions
const unsubs = {}
function createQuery(getRef) {
// Create a query function to pass to `useQuery`
return async ({ queryKey }) => {
let unsubscribe
let firstRun = true
// Wrap `onSnapshot` with a promise so that we can return initial data
const data = await new Promise((resolve, reject) => {
unsubscribe = onSnapshot(
getRef(),
// Success handler resolves the promise on the first run.
// For subsequent runs we manually update the React Query cache.
(response) => {
const data = format(response)
if (firstRun) {
firstRun = false
resolve(data)
} else {
client.setQueryData(queryKey, data)
}
},
// Error handler rejects the promise on the first run.
// We can't manually trigger an error in React Query, so on a subsequent runs we
// invalidate the query so that it re-fetches and rejects if error persists.
(error) => {
if (firstRun) {
firstRun = false
reject(error)
} else {
client.invalidateQueries(queryKey)
}
},
)
})
// Unsubscribe from an existing subscription for this `queryKey` if one exists
// Then store `unsubscribe` function so it can be called later
const queryHash = hashQueryKey(queryKey)
unsubs[queryHash] && unsubs[queryHash]()
unsubs[queryHash] = unsubscribe
return data
}
}
// Automatically remove Firestore subscriptions when all observing components have unmounted
client.queryCache.subscribe(({ type, query }) => {
if (
type === 'observerRemoved' &&
query.getObserversCount() === 0 &&
unsubs[query.queryHash]
) {
// Call stored Firestore unsubscribe function
unsubs[query.queryHash]()
delete unsubs[query.queryHash]
}
})
// Format Firestore response
function format(response) {
// Converts doc into object that contains data and `doc.id`
const formatDoc = (doc) => ({ id: doc.id, ...doc.data() })
if (response.docs) {
// Handle a collection of docs
return response.docs.map(formatDoc)
} else {
// Handle a single doc
return response.exists() ? formatDoc(response) : null
}
}
// React Query context provider that wraps our app
export function QueryClientProvider(props) {
return (
<QueryClientProviderBase client={client}>
{props.children}
</QueryClientProviderBase>
)
}