I'm triggering a cloud function with onWrite. Within the onWrite function, I want to do something with the ref ID of the document that was written. How can I grab this? My current code looks something like this, but I don't know how to fill eventID.
exports.syncEvents = functions.firestore
.document('events/{eventID}')
.onWrite((change, context) => {
admin.firestore().collection('users').doc(host).collection('events').doc(eventID).set({
active: true
})
});
change.after is a DocumentSnapshot of the document that changed, after it was written. DocumentSnapshot has a property called id that contains the id of the document. So change.after.id is the document id.
The context object contains the params of the query. In your example, the context object will look like this:
{
...
params: {
eventID: "whatever-eventId-is"
}
...
}
So you just call get it from the context:
const eventId = context.params.eventId;
Here is more about context: https://firebase.google.com/docs/reference/functions/cloud_functions.eventcontext