再次删除带有文档和集合的集合（firestore react native）

Question

I am having trouble deleting on firestore

here's my delete

var chatId = route.params.number; // +639266825843
var docRef = firestore().collection('ChatRoom').doc(chatId).collection('messages');
docRef.doc(chatId).delete();

but everytime i try to delete nothing happens. There's no error at all.

this is how I set that collection

firestore().collection('ChatRoom')
.doc(id)
.collection('messages')
.add({...myMsg, createdAt:firestore.FieldValue.serverTimestamp()})

Answer 1

If you want to delete all the docs of the messages (sub)collection, you need to query the collection and delete each document, for example by using Promise.all() or by using a batched write (containing only deletions)

  var chatId = route.params.number; // +639266825843
  var colRef = firestore()
    .collection('ChatRoom')
    .doc(chatId)
    .collection('messages');

  colRef.get().then((querySnapshot) => {
    Promise.all(querySnapshot.docs.map((d) => d.ref.delete()));
  });

The docs property of the QuerySnapshot returns an array of QueryDocumentSnapshot s.

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In addition, look at how your +639266825843 document is displayed in an italic font: this means, in the console, that this document is only present as "container" of one or more sub-collection(s) but that it is not a "genuine" document. It does not exist, because you never created it, you only created docs in one of its subcollections. More detail here .