===データの並べ替え===
*https://firebase.google.com/docs/firestore/query-data/order-limit-data?hl=ja
====AngularFire====
*https://github.com/angular/angularfire/blob/master/docs/firestore/querying-collections.md
==Collection==
<pre>
import { Observable } from 'rxjs';
import { AngularFirestore, QuerySnapshot, DocumentSnapshot, DocumentData } from '@angular/fire/firestore';
constructor(
public firestore: AngularFirestore
) { }
public getInformations(user?: User): Observable<QuerySnapshot<DocumentData>> {
const path = `${FS_PATH_INFORMATIONS}`;
console.log(`get informations..[${path}]`);
return this.firestore.collection<InformationCard>(path).get();
}
</pre>
<pre>
ngOnInit(): void {
let outer = this;
this.bookService.getInformations().subscribe({
next(p){
p.forEach(d => {
outer.infoCards.push(d.data() as InformationCard);
});
}
});
}
</pre>