Sending FCM Notifications for Multiple Documents Using Firebase Cloud Functions

Learn how to efficiently send `FCM notifications` for multiple documents using `Firebase Cloud Functions`. We'll guide you through the process step-by-step.
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This video is based on the question https://stackoverflow.com/q/65545315/ asked by the user 'Amit chaudhary' ( https://stackoverflow.com/u/14150456/ ) and on the answer https://stackoverflow.com/a/65546250/ provided by the user 'Stratubas' ( https://stackoverflow.com/u/6002078/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Sending FCM Notifications for Multiple Documents using Firebase Cloud Functions

Firebase Cloud Messaging (FCM) is a powerful tool for sending notifications to users on their devices. However, when dealing with multiple documents that require unique notifications based on their content, things can get tricky. In this guide, we’re going to address how to send FCM notifications for multiple documents retrieved through a Firebase query using Firebase Cloud Functions.

The Problem

Imagine you have a collection of bookings, and you want to notify users when certain documents in that collection meet specific criteria. For example, you might want to send notifications based on the status of bookings that are "booked" and have a start time that is in the future. You’re able to filter these documents using a Firebase query, but how do you efficiently send out notifications for each document when each notification has different content?

Here is a section of the query you might be using:

[[See Video to Reveal this Text or Code Snippet]]

You have already established your query and are left with the challenge of looping through each document and sending an individual FCM notification. Let’s dive into the solution.

The Solution

To send notifications for multiple documents, you can use a simple for loop within an async function. This is how you can approach the problem in a clean and effective manner.

Step 1: Retrieve Documents

First, you retrieve the documents that match your query. Using the await keyword allows you to wait for the query to complete before proceeding.

Step 2: Loop Through Documents

Once you have the documents, a for loop can iterate over each document. Inside the loop, you’d call a function that handles the sending of the FCM notification with the necessary payload.

Here is how the code would look:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Define the Notification Function

You will need to define what sendNotificationForDoc(doc) does. This function will take the doc as an argument and will create and send the notification based on the content of each document.

Here’s a simple structure you might use:

[[See Video to Reveal this Text or Code Snippet]]

Key Points to Remember

Asynchronous Handling: Ensure that your function is async. This allows await to be used for promise resolution.

Dynamic Payloads: The payload can be customized based on the data from each document, allowing for personalized notifications.

Error Handling: Consider incorporating try/catch blocks within your notification function to handle any potential errors during the sending of notifications.

Conclusion

Sending FCM notifications for multiple documents in Firebase is a straightforward process once you understand how to structure your queries and loop through document results. By using a for loop within an asynchronous function, you can send unique notifications based on the content of each document efficiently.

Now you can implement this solution in your Firebase project and start notifying your users about their bookings or any other relevant updates. Consider exploring additional ways to enhance the user experience with more sophisticated notification payloads or including more data in your notifications.

Happy coding!

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