使用云函数向文档添加字段

Question

I wanted to make the id of each document as a field of that document so that I can store it inside the doc. here is the cloud function I created:

 exports.assignPID = functions.database
.ref('/players/{playerId}')
.onCreate((snapshot,context)=>{
    const playerId = context.params.playerId;
    console.log("new player "+playerId);

    // const data = snapshot.val();
    return snapshot.ref.update({'pid': playerId})
})

this deploys without any errors but whenever I add a new document to the 'players' collection there is no change in the document whatsoever

Answer 1

In your question, you use the word "document" to describe your data, which is a Firestore concept, and you've tagged this question google-cloud-firestore. However, the code you've written is for Realtime Database, which is a completely different product. So it will never run in response to changes in Firestore.

When you declare a function with functions.database , that's means Realtime Database. Instead, you should declare a Firestore trigger with functions.firestore . Please read the linked documentation for information about how to do that.