Count data
You can use the count prefilter to count the values of your collection.
Note that the usage of the prefilter types
Take, Skip, Select, Count, First and Last will require the collection data to always get queried from the database on every change. Keep that in mind when creating performance critical tasks.
\f:(typescript:Angular) export class DemoComponent implements OnInit {\n \tvalues$: Observable<number>;\n \tconstructor(private db: SapphireDbService) { }\n\n \tngOnInit() {\n \t\tthis.values$ = this.db.collection<Entry>('entries')\n \t\t\t.count()\n \t\t\t.values();\n \t}\n }
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