CODEWITHSUNDEEP
firebasegoogle-cloud-firestoregoogle-cloud-functions
Naveen Sharma
Naveen Sharma

Reputation: 79

Cloud Firestore triggers " Your trigger must always point to a document"

what i am trying to do is ... my document flow

batch(collection) -> {batchName}(document) -> subjects -> {subjectName} -> attendance

i want to trigger firestore function whenever there is an update in the attendance object

So in the documentation of the Cloud Firestore triggers, i found this line "Your trigger must always point to a document" with an example ... here is the link to the documentation

which gave me hope that it is possible to do that and i am failing to achieve this,

exports.attendenceTrigger = functions.firestore.document('batche/{batchName}/subjects/{subjectName}/attendance')

is it possible to do it ? if yes then what am i doing wrong?

Upvotes: 0

Views: 81

Answers (1)

Dharmaraj
Dharmaraj

Reputation: 50830

You have specified a path to a collection

'batche/{batchName}/subjects/{subjectName}/attendance'
 (col)    (doc)      (col)      (doc)       (col)

However, your path must point towards a document so valid paths include:

// Triggers a function when a doc in subjects sub-collection is changed
'batche/{batchName}/subjects/{subjectName}'

// or

// Triggers a function when a doc in attendance sub-collection is changed
'batche/{batchName}/subjects/{subjectName}/attendance/{attendanceId}'

Is attendance a sub-collection? If yes, then use the second path above to listen trigger a function when a document in that collection is created/modified/deleted. If attendance is a field in a {subjectName} document then you should use the first line and access the attendance field from the snapshot snapshot.data().attendance.

Upvotes: 1

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