I have the following cloud function which creates a doc in a 'student_history' collection for every new doc creation in 'students' collection:
document("students/{student_id}").onCreate(
async (snap, context) => {
const values = snap.data();
console.log(values);
console.log(typeof values);
return db.collection("student_history").add({...values, createdAt:FieldValue.serverTimestamp()});
});
I wanted to generalise this for 2 other collections. Something like this:
export const onStudentCreated = functions.firestore.document('/students/{id}').onCreate(onDocCreated);
export const onBatchCreated = functions.firestore.document('/batches/{id}').onCreate(onDocCreated);
export const onTeacherCreated = functions.firestore.document('/teachers/{id}').onCreate(onDocCreated);
My question is, how can I have my onDocCreated function receive a collection name (eg, students, batches or teachers) and make an entry to a corresponding students_history, batches_history or teachers_history?
async function onDocCreated() {
async (snap, context) => {
const values = snap.data();
console.log(values);
console.log(typeof values);
return db.collection("NAMEOFTHECOLLECTION_history").add({
...values,
createdAt: FieldValue.serverTimestamp()
});
}
}
First, you'll need to pass take the snap and context params in onDocCreated() function itself. The snap is a QueryDocumentSnapshot so you can use get collection ID from the parent property as shown below:
async function onDocCreated(snap, context) {
const values = snap.data();
console.log(values);
const collectionName = snap.ref.parent.id;
console.log("Collection Name:", collectionName)
return db.collection(`${collectionName}_history`).add({
...values,
createdAt: admin.firestore.FieldValue.serverTimestamp(),
});
}
Adding to @Dharamaj 's answer,
As per his suggestion
export const onStudentCreated = functions.firestore.document('/students/{id}').onCreate(onDocCreated);
export const onBatchCreated = functions.firestore.document('/batches/{id}').onCreate(onDocCreated);
export const onTeacherCreated = functions.firestore.document('/teachers/{id}').onCreate(onDocCreated);
needs to be replaced with:
exports.onStudentCreated = functions.firestore.document('/students/{id}').onCreate(onDocCreated);
exports.onBatchCreated = functions.firestore.document('/batches/{id}').onCreate(onDocCreated);
exports.onTeacherCreated = functions.firestore.document('/teachers/{id}').onCreate(onDocCreated);