Firestore & Cloud Function: Create new collection document using my own Document ID

Question

Regarding Firestore, Cloud Function, Typescript.

My goal:

New User registers with app.
New User triggers cloud function (typescript) to populate my Firestore UserAccounts collection with a new doc.
Cloud Function uses the User UID from Firebase Auth as the Document ID for the new document being added to the UserAccounts collection.

Problem: A new doc is created, however, it uses the auto-gen Doc ID and the doc itself has an additional Doc ID field within.

Note: Using the Firebase Website, I can manually add new documents to a collection using my own Doc ID.

Example Code :

export const onNewRegistration = functions.auth.user().onCreate((user) => {
    functions.logger.info("New User Created - Name: ", user.email, ", UID: ", user.uid);
    const db = admin.firestore();
    const newdoc = db.collection('UserAccounts').add({
        'Document ID': user.uid,
        State: 'Unverified'
    });

    return newdoc;
});

Thank you, all.

Doug Stevenson · Accepted Answer · 2020-08-07 20:14:33Z

5

If you know the ID of the document to create, don't use add(). add() always creates a new document with a new random ID.

You should instead use doc() to create a new document reference with the given ID, then use set() to write it:

return db.collection('UserAccounts').doc(user.uid).set({
    // fields and values here will be written to the document
});

See also: Firestore: difference between set() and add()

answered Aug 7, 2020 at 20:14

Doug Stevenson

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5 Comments

OneKneeToe Over a year ago

Worked like a charm. Thank you for the help, Doug.

Doug Stevenson Over a year ago

Great! On Stack Overflow, it's customary to upvote and accept helpful answers using the buttons on the left.

OneKneeToe Over a year ago

Hey Doug - I did upvote, but since I'm a noob, it doesn't reflect on the page, thought it does count behind the scenes.

Doug Stevenson Over a year ago

You must know something about Stack Overflow that I don't! But could you try again anyway? It should show both a "1" and a green checkmark when you're done. They all end up like that. There aren't any hidden votes.

OneKneeToe Over a year ago

Checkmark is now green (I missed that). As for the upvote, the following message is displayed, "Thanks for the feedback! Votes cast by those with less than 15 reputation are recorded, but do not change the publicly displayed post score."

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