Update 2/26/24
This post is out of date since Firebase 9. For latest Firebase posts, see Code.Build.
I am crazy, so I created a quick reference. Let me know if I missed one!
Note:
afa = AngularFireAuth
afs = AngularFirestore
but should be same premise in any framework.
Docs
const foo = await this.afs.doc(`docPath`).valueChanges()
.pipe(take(1)).toPromise();
or
const foo = (await this.afs.doc('docPath').get()
.toPromise()).data();
or
const foo = (await this.afs.doc('docPath').get()
.pipe(take(1)).toPromise()).data();
or
const foo = (await this.afs.doc('docPath').snapshotChanges()
.pipe(take(1)).toPromise()).payload.data();
But the shortest is:
const foo = (await this.afs.doc('docPath').ref.get()).data();
Collections
const foo = await this.afs.collection('colPath').valueChanges()
.pipe((take(1))).toPromise();
or
const foo = (await this.afs.collection('colPath').snapshotChanges()
.pipe(take(1)).toPromise()).map((m) => m.payload.doc.data());
or
const foo = (await this.afs.collection('colPath').get()
.toPromise()).docs.map((m) => m.data());
or (overkill from last version)
const foo = (await this.afs.collection('colPath').get()
.pipe(take(1)).toPromise()).docs.map((m) => m.data());
or
const foo = (await this.afs.collection('colPath').ref.get())
.docs.map((m) => m.data());
User
As you may have noticed...
const bar = await this.afa.currentUser;
... does not load correctly in a lot of cases.
So try these:
const bar = await this.afa.authState.pipe(take(1)).toPromise();
or (authstatechanged is most accurate)
const bar = await new Observable(
(observer: any) => { this.afa.onAuthStateChanged(observer) }
).pipe(take(1)).toPromise();
or
const bar = await new Promise(
(resolve: any, reject: any) =>
this.afa.onAuthStateChanged((user) => {
user ? resolve(true) : resolve(false);
}, (e: any) => reject(e))
);
or (the shortest)
const bar = await this.afa.user.pipe(take(1)).toPromise();
And anywhere you can use take(1) you can use first() if you want to emit an error.
J
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