Angular Firebase Cheat Sheet by oisar

this.db.collection(collection)
.valueChanges()
.subscribe();

this.db.collection(collection)
.valueChanges().subscribe(
   snaps => {
      const collection = snaps.map( snap => {
          return {
             id: snap.payload.doc.id,
             ...snap.payload.doc.data()
          }
      }
    }
);

this.db.collection(collection)
.stateChanges().subscribe(
   snaps => {
      const collection = snaps.map( snap => {
          return {
             id: snap.payload.doc.id,
             ...snap.payload.doc.data()
          }
      }
    }

this.db.collection(collection, ref => {
  return ref.orderBy(param).where(param, "==", what)
})
.snapshotChanges()...}}
...
.where(param, "== , >, <= or any", what)...
.where(param, "array-contains", what)...
.startAt(number).endAt(number)... (first element included)
.startAfter(number).endAt(number)...(first element is not included)

this.db.doc(collection/id).set(changes)...

this.db.doc(collection/id).update(changes)...

const fRef = this.db.doc(collection/id).ref;
const oRef = this.db.doc(collection/id).ref;

const batch = this.db.firestore.batch();

batch.update(fRef, { updates });
...
const batch$ = of(batch.commit());
batch$.subscribe();

const d = this.db
.collection(collection);
return d.doc(id).delete();

private storage: AngularFireStorage;
...
upload(event) {
 const file: File = event.target.files[0];
 const path = 
collection/id/filename
;
 const task = this.storage.upload (path, file);
 task.snapshotChanges().subscribe();
}
...
task.percentageChanges() - get current upload percentage

profileUrl: Observable<string | null>;
  constructor(private storage: AngularFireStorage) {
     const ref = this.storage.ref('users/davideast.jpg');
     this.profileUrl = ref.getDownloadURL();
  }
...
meta: Observable<any>;
  constructor(private storage: AngularFireStorage) {
     const ref = this.storage.ref('users/davideast.jpg');
     this.meta = ref.getMetadata();
  }
...
uploadFile(event) {
    const file = event.target.files[0];
    const filePath = 'name-your-file-path-here';
    const ref = this.storage.ref(filePath);
    const task = ref.put(file, { customMetadata: { blah: 'blah' } });
  }