How to get the collections inside a document in firestore

Question

I am trying to get all the collections inside the document, but i am getting errors.

I am doing this:

this.db = firebase.firestore();

this.db.collection("RestaurantMenus").doc(this.restaurant.key).listCollections().then((querySnapshot) => {
      querySnapshot.forEach((collection) => {
        console.log("collection: " + collection.id);
      });

And it says listCollections() is not a function. I tried getAllCollections() its says the same. I tried to get the data from the doc but in only get the data and not the collections.

I dont know what else to do.What i am doing wrong?

My firestore:

Collection --- > "RestaurantMenus" ----> doc: this.restaurant.key ----> collection that i want to get

Answer 1

The APIs you're trying to call are only available in the server-side SDKs for Firestore. There is no API to get a list of collections using the client SDKs for Firestore.

For this reason you'll typically want to use fixed names (like your "RestaurantMenus") for your collection ID, and only use generated IDs for documents.