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I can't retrieve the previous document. const previousData = change.before.data(); #1470

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Patrick386 opened this issue Oct 16, 2023 · 3 comments
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I can't retrieve the previous document. const previousData = change.before.data(); #1470

Patrick386 opened this issue Oct 16, 2023 · 3 comments
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@Patrick386
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Patrick386 commented Oct 16, 2023 •
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const previousData = change.before.data(); I can't retrieve the previous document.
The 'previousData' log value is undefined.
How can I get document data?

"firebase": "^8.6.8",
"firebase-admin": "^11.10.1",
"firebase-functions": "^4.4.1",

Node.js v18.13.0

exports.
    .firestore.document("chatMessages/{messageId}")
    .onWrite(async (change, context) => {
        const newData = change.after.exists ? change.after.data() : null;
        // const previousData = change.before.exists ? change.before.data() : null;
        const previousData = change.before.data();

        console.log(">>> previous chat data status: ", previousData);
        console.log(">>> new chat data status: ", newData?.status);
    });
스크린샷 2023-10-16 오전 10 55 56 스크린샷 2023-10-16 오전 11 05 39
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I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

@blidd-google blidd-google self-assigned this Oct 16, 2023
@blidd-google
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blidd-google commented Oct 16, 2023 •
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The onWrite trigger is invoked for all changes to a document; if you are creating a new document, then there will be no data in the before property.

However I would first recommend that you try out 2nd gen Firestore triggers! You can find the docs here; the 2nd gen triggers have a slightly different interface, but the logic is similar.

I'm going to close this since GitHub issues are reserved for reporting bugs, but you can reach out to Firebase Support here if you continue to have trouble writing Firestore functions.

@Patrick386
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The onWrite trigger is invoked for all changes to a document; if you are creating a new document, then there will be no data in the before property.

However I would first recommend that you try out 2nd gen Firestore triggers! You can find the docs here; the 2nd gen triggers have a slightly different interface, but the logic is similar.

I'm going to close this since GitHub issues are reserved for reporting bugs, but you can reach out to Firebase Support here if you continue to have trouble writing Firestore functions.

understand. Let's use the 2nd trigger. thank you

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