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src/app/modules/songs/services/file-data.service.ts

@@ -0,0 +1,34 @@
+import {Injectable} from '@angular/core';
+import {SongDataService} from './song-data.service';
+import {File} from './file';
+import {Observable} from 'rxjs';
+import {map} from 'rxjs/operators';
+import {FileServer} from './fileServer';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class FileDataService {
+
+  constructor(private songDataService: SongDataService) {
+  }
+
+  public async put(songId: string, file: FileServer): Promise<string> {
+    const songRef = this.songDataService.getSongRef(songId);
+    const fileCollection = songRef.collection('files');
+    const id = await fileCollection.add(file);
+    return id.id;
+  }
+
+  public get$(songId: string): Observable<File[]> {
+    const songRef = this.songDataService.getSongRef(songId);
+    return songRef.collection<File>('files').snapshotChanges().pipe(map(actions => {
+      return actions.map(a => ({
+        ...a.payload.doc.data(),
+        id: a.payload.doc.id
+      }));
+    }));
+  }
+
+
+}