Mastering Firebase for Android Development

Cloud Firestore Triggers

Cloud Firestore is a recent release of the Firebase toolchain. Google labels it as the flexible, scalable NoSQL. To work with Function triggers for Firestore, you don't need to write extra code on the client side. Changes to Firestore can be achieved via DeltaDocumentSnapshot, which is an interface representing Cloud Firestore documents. The Cloud Firestore Function typically does the following actions:

• It anticipates changes to Firestore documents
• It triggers the function when an event fired and performs the task of the specific function
• Functions receive the data object with two snapshots of the data stored in Firestore, one with the old data and another with the new data

To trigger a Cloud Firestore function, ...