fix(firestore): do not return idField on valueChanges if document does not exists

Author: KingDarBoja

src/firestore/document/document.spec.ts

@@ -36,8 +36,8 @@ describe('AngularFirestoreDocument', () => {
 
     it('should get unwrapped snapshot', async (done: any) => {
       const randomCollectionName = afs.firestore.collection('a').doc().id;
-      const ref = afs.firestore.doc(`${randomCollectionName}/FAKE`) as firebase.firestore.DocumentReference<Stock>;
-      const stock = new AngularFirestoreDocument(ref, afs);
+      const ref = afs.firestore.doc(`${randomCollectionName}/FAKE`) as DocumentReference<Stock>;
+      const stock = new AngularFirestoreDocument<Stock>(ref, afs);
       await stock.set(FAKE_STOCK_DATA);
       const obs$ = stock.valueChanges();
       obs$.pipe(take(1)).subscribe(async data => {
@@ -46,10 +46,9 @@ describe('AngularFirestoreDocument', () => {
       });
     });
 
-    /* TODO(jamesdaniels): test is flaking, look into this
     it('should optionally map the doc ID to the emitted data object', async (done: any) => {
       const randomCollectionName = afs.firestore.collection('a').doc().id;
-      const ref = afs.firestore.doc(`${randomCollectionName}/FAKE`);
+      const ref = afs.firestore.doc(`${randomCollectionName}/FAKE`) as DocumentReference<Stock>;
       const stock = new AngularFirestoreDocument<Stock>(ref, afs);
       await stock.set(FAKE_STOCK_DATA);
       const idField = 'myCustomID';
@@ -59,7 +58,7 @@ describe('AngularFirestoreDocument', () => {
         expect(data).toEqual(jasmine.objectContaining(FAKE_STOCK_DATA));
         stock.delete().then(done).catch(done.fail);
       });
-    });*/
+    });
 
   });
 
@@ -81,18 +80,6 @@ describe('AngularFirestoreDocument', () => {
         });
     });
 
-    it('should get unwrapped snapshot', async (done: any) => {
-      const randomCollectionName = afs.firestore.collection('a').doc().id;
-      const ref = afs.firestore.doc(`${randomCollectionName}/FAKE`) as DocumentReference<Stock>;
-      const stock = new AngularFirestoreDocument<Stock>(ref, afs);
-      await stock.set(FAKE_STOCK_DATA);
-      const obs$ = stock.valueChanges();
-      obs$.pipe(take(1)).subscribe(async data => {
-        expect(data).toEqual(FAKE_STOCK_DATA);
-        stock.delete().then(done).catch(done.fail);
-      });
-    });
-
   });
 
 });

src/firestore/document/document.ts

@@ -88,7 +88,7 @@ export class AngularFirestoreDocument<T = DocumentData> {
   valueChanges<K extends string>(options: { idField?: K } = {}): Observable<T | undefined> {
     return this.snapshotChanges().pipe(
       map(({ payload }) =>
-        options.idField ? {
+        options.idField && payload.exists ? {
           ...payload.data(),
           ...{ [options.idField]: payload.id }
         } as T & { [T in K]: string } : payload.data()