How to update a dynamic field name in Firebase Firestore?-CodePudding

I want to do something like the below code in React Native:

await firestore()
      .collection('Users')
      .doc('ABC')
      .update({
        this.state.documentName: url,
      });

But I need this.state.documentName to be dynamic but VSCode is reporting an error saying ':' expected.. What am I missing?

CodePudding user response：

You were very close, in order to compute the field name, wrap it in square brackets:

await firestore()
      .collection('Users')
      .doc('ABC')
      .update({
        [this.state.documentName]: url,
      });

The update() method also accepts arguments in key-value pairs:

await firestore()
      .collection('Users')
      .doc('ABC')
      .update(this.state.documentName, url);

Note: You should make sure to employ appropriate security rules to prevent a user from promoting themselves to an admin if that information is also contained in their user document.

CodePudding user response：

Define the documentName from state outside of the async function in a variable then use it to update in the function

var db = firebase.firestore();
var documentName = this.state.documentName;
await db.collection("Users")
.doc('ABC')
.update({documentName: "bar"});