generate our own id document with firestore

Question

How can I choose the id document that I want to use :

firebase.firestore().collection("Users").doc(firebase.auth().currentUser.uid).collection("tasks").add({task:task.taskname,category:task.category})

Here, I create a randomly id document but I want to choose one (I mean the id of the document in the collection tasks)

samthecodingman · Accepted Answer · 2021-04-17T12:49:51.480

someCollectionRef.add(/* data */) is an alias for someCollectionRef.doc().set(/* data */).

So to specify your own ID, just use:

yourCollectionRef.doc(/* your id */).set(/* your data */);

firebase.firestore()
  .collection("Users")
  .doc(firebase.auth().currentUser.uid)
  .collection("tasks")
  .doc(/* your custom ID here */)
  .set({
    task: task.taskname,
    category: task.category
  })
  .then(() => console.log('success!'))
  .catch((err) => console.error('failed to set doc data!', err));

To place the document ID in the document, you can split this chain into two parts as below. Unless you plan on using Collection Group queries, you could use FieldPath.documentId() to query documents by their ID instead without needing to store it in the document.

const myTaskDocRef = firebase.firestore()
  .collection("Users")
  .doc(firebase.auth().currentUser.uid)
  .collection("tasks")
  .doc(/* your custom ID here */);

myTaskDocRef
  .set({
    id: myTaskDocRef.id,
    task: task.taskname,
    category: task.category
  })
  .then(() => console.log('success!'))
  .catch((err) => console.error('failed to set doc data!', err));

Thank you! And if I want to use in this document, the id of the document, is it possible? For example, for the id document X, I use another filed "id" that is equal to X — user123456, Apr 17 '21 at 12:35

score -1 · Answer 2 · answered Apr 17 '21 at 12:41

Adding a document using .add() returns a document reference object

So using the following code from the documentation here, this is the code you want:

// Add a new document with a generated id.
db.collection("cities").add({
    name: "Tokyo",
    country: "Japan"
})
.then((docRef) => {
    console.log("Document written with ID: ", docRef.id);
})
.catch((error) => {
    console.error("Error adding document: ", error);
});

docRef.id holds the id of the document you added.

generate our own id document with firestore

2 Answers2