Ways to retrieve the document ID or address in TypeScript when using Firestore

I am currently developing a function that will send notifications to all devices where a user is logged in whenever a new order document is added to their account.

Below is the code I have written to execute this function. My main query revolves around accessing the specific {userEmail}/{orderId} data from the document.

export const orderUserNotif = functions.firestore
    .document('userAccounts/{userEmail}/orders/{orderId}')
    .onCreate(async snapshot => {

        const order = snapshot.data();

        const querySnapshot = await db
            .collection('userAccounts')
            .doc("{userEmail}") //Looking to retrieve userEmail from the document address
            .collection('tokens')
            .get();

        const tokens = querySnapshot.docs.map(snap => snap.id);

        const payload: admin.messaging.MessagingPayload = {
            notification: {
                title: order!.title + " with ID " + '{orderId}', //Attempting to access order id at this point
                body: `Your order has been delivered`,
            }
        };

        return fcm.sendToDevice(tokens, payload);
    })
typescriptgoogle-cloud-firestorepush-notificationgoogle-cloud-functionsfirebase-cloud-messaging

Answer №1

To retrieve the values from the path that triggered the Cloud Function, simply use context.params. This context is provided as the second parameter to your Cloud Function without prior declaration.

Here's an example:

export const orderUserNotification = functions.firestore
    .document('userAccounts/{userEmail}/orders/{orderId}')
    .onCreate(async (snapshot, context) => {

        const orderData = snapshot.data();

        const querySnapshot = await db
            .collection('userAccounts')
            .doc(context.params.userEmail)
            .collection('tokens')
            .get();

        const tokenIds = querySnapshot.docs.map(doc => doc.id);

        const messagePayload: admin.messaging.MessagingPayload = {
            notification: {
                title: orderData!.title + " with ID " + context.params.orderId,
                body: "Your order has been shipped",
            }
        };

        return fcm.sendToDevice(tokenIds, messagePayload);
    })

For more information, refer to Firebase's documentation on utilizing wildcards in specifying document groups.

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