Presented below is a snippet of my cloud function
exports.onUpdateEvent = functions.firestore.document('collection/{documentId}')
.onUpdate((change, context) => {
const after: FirebaseFirestore.DocumentData = change.after.data();
const before: FirebaseFirestore.DocumentData = change.before.data();
})
I am curious if there might be instances where either 'after' or 'before' contain values of null or undefined?
A situation where fields may be null is when the data being evaluated has not been created yet. The official documentation advises to handle this by checking for null values, as shown below:
// Retrieve the current document value.
// If the document doesn't exist, it has likely been deleted.
const docValue = change.after.exists ? change.after.data() : null;
The correct answer is that onUpdate is called only when the document has been modified, so it requires existing data. To check for data existence, you should use onWrite function instead.
For more information, refer to the documentation provided by Harif at this link.
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