CODEWITHSUNDEEP
javascriptfirebasegoogle-cloud-firestore
gogoonline
gogoonline

Reputation: 69

Firestore how can i get top-level collection inside documents list?

example1) collection - doc - collection - doc - collection

example2) collection

example1 structure, I can import all the documents lists inside the last collection.

example2 structure, I can't get all the documents lists inside the collection.

how can i get top-level collection inside documents lists?

here is my code down here.

// this is example1. this is working!!
  dbService
    .collection("users")
    .doc(uid)
    .collection(uid)
    .doc("video")
    .collection(uid)
    .onSnapshot((snapshot) => {
      snapshot.docs.map((doc, index) => {
        videoList.push(doc.data());
        console.log(doc.data());
      });
    });



// this is example2. this is not working !!!!!
  dbService
   .collection("users")
   .onSnapshot((snapshot) => {
    snapshot.docs.map((doc, index) => {
      videoList.push(doc.data());
      console.log(doc.data());
    });
  });

example2 is return empty array. why is this?

Upvotes: -1

Views: 195

Answers (1)

Frank van Puffelen
Frank van Puffelen

Reputation: 598847

Loading data from Firestore is shallow. This means that if you load documents from the users collection, no data from subcollections is automatically included.

If you want to load data from a specific user's video subcollection, you'll need to make an extra call:

  dbService
   .collection("users")
   .onSnapshot((snapshot) => {
    snapshot.docs.map((doc, index) => {
      if (/* this is a user you are interested in */) {
        snapshot.ref.collection(videos).get().then((videos) => {
          videos.forEach((video) => {
            videoList.push(video.data());
          })
          console.log(doc.data());
        });
      }
    });
  });

If you want to load all videos for all users you can use a so-called collection group query:

  dbService
   .collectionGroup("videos")
   .onSnapshot((snapshot) => {
    snapshot.docs.map((doc, index) => {
      videoList.push(doc.data());
      console.log(doc.data());
    });
  });

If you want to find the ID of the user for a specific video in here, you can find it with doc.ref.parent.parent.id.

Upvotes: 1

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