javascript - update cloud firestore document without id - Stack Overflow

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My Cloud Firestore looks like this:

users
  ├────random_id_1───{name, email, ...}
  ├────random_id_2───{name, email, ...}
 ...
  └────random_id_n───{name, email, ...}

I want to update a document of users given I have an unique identifier for it that is NOT the random id of the document (suppose, for example, the name is unique and I want to use it as identifier).

How can I update a document identifying it by a field of it?

My Cloud Firestore looks like this:

users
  ├────random_id_1───{name, email, ...}
  ├────random_id_2───{name, email, ...}
 ...
  └────random_id_n───{name, email, ...}

I want to update a document of users given I have an unique identifier for it that is NOT the random id of the document (suppose, for example, the name is unique and I want to use it as identifier).

How can I update a document identifying it by a field of it?

• javascript
• firebase
• google-cloud-firestore
• google-cloud-functions

Share Improve this question Follow edited Feb 5, 2019 at 20:20 Frank van Puffelen 600k8585 gold badges889889 silver badges859859 bronze badges asked Feb 5, 2019 at 18:54 DanielDaniel 7,73499 gold badges3636 silver badges102102 bronze badges

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1 Answer 1

Sorted by: Reset to default 9

Firestore can only update documents for which it knows the plete reference, which requires the document ID. On your current structure, you will have to run a query to find the document. So something like:

firebase.firestore().collection("users")
  .where("name", "==", "Daniel")
  .get()
  .then(function(querySnapshot) {
    querySnapshot.forEach(function(document) {
     document.ref.update({ ... }); 
    });
  });

If you have another attribute that is unique, I'd always remend using that as the IDs for the documents. That way you're automatically guaranteed that only one document per user can exist, and you save yourself having to do a query to find the document.

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