javascript - Data in Firestore not updating - Stack Overflow

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Here is a javascript function intending to perform an update on FireStore, which does not work.

I will be more that happy if anyone can see an issue in the code.

function makeUpdate(key,name) {
    let theCollection = db.collection("InformationList"),
    infoUnit = theCollection.doc(key).get().then(function(doc) {
        if (doc.exists) {
            console.log("infoUnit -name-:" + doc.get("name"));
            console.log("infoUnit -telephone-:" + doc.get("telephone"));
            let updateDico = {};
            updateDico["name"] = name;
            doc.update(updateDico);
        } else {
            console.log("embassyUpdate --> No such document!");
        }
    }).catch(err => {
        console.log("Error getting documents (in makeUpdate)", err);
    });
}

Apart from the fact that it does not perform the expected update, it prints three messages in the logs:

• infoUnit -name-: some name
• infoUnit -telephone-: some telephone number
• Error getting documents (in makeUpdate)

From that I can see that a record is found in the database as expected. But at the same time an unknown error occurs.

Here is a javascript function intending to perform an update on FireStore, which does not work.

I will be more that happy if anyone can see an issue in the code.

function makeUpdate(key,name) {
    let theCollection = db.collection("InformationList"),
    infoUnit = theCollection.doc(key).get().then(function(doc) {
        if (doc.exists) {
            console.log("infoUnit -name-:" + doc.get("name"));
            console.log("infoUnit -telephone-:" + doc.get("telephone"));
            let updateDico = {};
            updateDico["name"] = name;
            doc.update(updateDico);
        } else {
            console.log("embassyUpdate --> No such document!");
        }
    }).catch(err => {
        console.log("Error getting documents (in makeUpdate)", err);
    });
}

Apart from the fact that it does not perform the expected update, it prints three messages in the logs:

• infoUnit -name-: some name
• infoUnit -telephone-: some telephone number
• Error getting documents (in makeUpdate)

From that I can see that a record is found in the database as expected. But at the same time an unknown error occurs.

• javascript
• firebase
• google-cloud-firestore

Share Improve this question Follow edited Oct 26, 2018 at 10:28 Doug Stevenson 319k3636 gold badges456456 silver badges473473 bronze badges asked Oct 26, 2018 at 10:21 MichelMichel 11.8k2121 gold badges102102 silver badges219219 bronze badges

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3 Answers 3

Sorted by: Reset to default 3

There is no update() method on doc (which a DocumentSnapshot object). A DocumentSnapshot just contains the data read from get(). If you want to write data back into a document, you'll need to use a DocumentReference object, probably the same one you got when you called theCollection.doc(key).

There is no such method called update() which you can invoke on doc DataSnapshot object itself.

You'll have to use the set() method on the Document Reference which you get from doc.ref to update the reference.

This is how I've updated my data.

     await db
      .collection('collectionName')
      .doc('documentId')
      .update({
        name: "Updated Name",
        telephone: "0000000000"
      });

You need to know document id and you can update your value like this.

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