how to get the ID of a sub collection in Firestore HTML?

Question

I have created a collection name ("users") and inside it i have created subCollection("innerGuides"). I know how to retrieve data from the main collection ("users"), but i want to know how can i get the ID of my subCollection("innerGuides").

db.collection("users").doc(user.uid).collection("innerGuides").doc("BGP9O0Rh2ThiL40tXOVG").get().then(doc => {
    console.log(user.uid);
    console.log(doc.data().content);
  }).catch(error => {
    console.log(error);
  })

as you can see i can retrieve my main collection UID through "user.uid" but for my subCollection how can i retrieve its "uid". I have typed the subCollection uid, but how to retrieve it dynamically.

Answer 1

To get the id of a DocumentSnapshot is, from your example:

db.collection("users").doc(user.uid).collection("innerGuides").doc("BGP9O0Rh2ThiL40tXOVG").get().then(doc => {
    console.log(doc.id);  // <-- here
    console.log(doc.data().content);
  }).catch(error => {
    console.log(error);
  })

You can also use doc.exists to see if the document your get() actually exists.

To see your document, with id, something like:

console.log({
  id: doc.id,
  ...doc.data(),
});

The id of the sub-collection something like: users/the-user-id/innerGuides/BGP9O0Rh2ThiL40tXOVG . There is no way to only return BGP9O0Rh2ThiL40tXOVG , as by itself it isn't a complete reference. If you need that value parse it out of the id. JavaScript has many ways to do that. One off the top of my head is split():

const subId = id.split('/')[3]

Probably best to validate the array first, etc., but it will get you the id when successful.