firestore get first document in collection and delete it firestore get first document in collection and delete it

The solution for “firestore get first document in collection and delete it firestore get first document in collection and delete it” can be found here. The following code will assist you in solving the problem.

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// you need a reference field like timestamp

// this will work in a cloud function

return admin.firestore().collection(“yourCollection”)

.orderBy(“yourTimestamp”, “desc”)

.limit(1)

.get()

.then(querySnapshot => {

    if (!querySnapshot.empty) {

        //We know there is one doc in the querySnapshot

        const queryDocumentSnapshot = querySnapshot.docs[0];

        return queryDocumentSnapshot.ref.delete();

    } else {

        console.log(“No document corresponding to the query!”);

        return null;

    }

});return admin.firestore().collection(“yourCollection”)

.orderBy(“yourTimestamp”, “desc”)

.limit(1)

.get()

.then(querySnapshot => {

    if (!querySnapshot.empty) {

        //We know there is one doc in the querySnapshot

        const queryDocumentSnapshot = querySnapshot.docs[0];

        return queryDocumentSnapshot.ref.delete();

    } else {

        console.log(“No document corresponding to the query!”);

        return null;

    }

});

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