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Learn how to delete queried Firestore documents in a Cloud Function after retrieving them using Node.js and Google Cloud Firestore.
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How to Delete Queried Firestore Documents Using a Google Cloud Function

When working with Google Cloud Firestore, there are scenarios where you may need to delete multiple documents after querying them. This task can be automated using Google Cloud Functions. In this guide, we will walk through the steps to delete queried Firestore documents using a Cloud Function with Node.js.

Prerequisites

Before diving in, ensure you have the following prerequisites:

Node.js installed on your local machine.

Firebase CLI installed and configured.

A Firebase project with Firestore enabled.

Basic knowledge of Google Cloud Functions and Firestore.

Setting Up Your Cloud Function

First, create a new Firebase project or navigate to your existing project's directory. Initialize Firebase functions if you haven't already by running:

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

This will create a functions/ directory with some boilerplate code.

Writing the Cloud Function

Open the functions/index.js file and start by importing the required modules:

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

Next, write a function to query and delete documents from a Firestore collection. For example, let's delete all documents from a 'users' collection where the active field is false:

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

In this example:

We create a Cloud Function named cleanUpInactiveUsers that runs every 24 hours.

We query the 'users' collection for documents where the active field is false.

We use a batch to delete the returned documents to ensure atomicity.

Deploying the Cloud Function

Deploy your Cloud Function to Firebase by running:

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

This command deploys your Cloud Functions to Google Cloud, where they will run according to the schedule specified.

Conclusion

By following these steps, you can set up a Cloud Function to query and delete Firestore documents automatically. This approach helps in maintaining clean and efficient Firestore collections over time. Whether you're managing inactive user records or outdated data, Google Cloud Functions combined with Firestore makes the process seamless.