How can I get the Google Firestore sub-collections together with all the documents at once using Angular

Question

I have created a database using Google Firestore. I need to get all Documents in the Collection as well as the Sub-Collection for each Document in one response.

So, let's say I have a Stores Collections with a set of Documents. Each Document has a Sub-Collection called Reviews. so my Firestore path would be like this: /stores/storeID/reviews/reviewID

I can retrieve all Store Documents and Reviews individually, but I want to combine the response for the Documents and Sub-Collections into one response.

I have tried doing this:

this.firestoreService
  .colWithIds$('restaurants')
  .switchMap(restaurants => {
    const res = restaurants.map(restaurant => {
      return this.firestoreService
        .col$(`restaurants/${r.id}/ratings`)
        .map(ratings => Object.assign(restaurant, {ratings}));
    });
    return Observable.combineLatest(...res);
  })
  .subscribe(restaurants => console.log(restaurants);

For reference, I am using these helpers: AngularFirebase中 上面显示的代码文章可以在here.

中找到

我曾尝试实现上述代码，但似乎无法使其正常工作。

在此方面的任何帮助将不胜感激。

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