delete a collection with document and collection again inside (firestore react native)

I am having trouble deleting on firestore

here’s my delete

var chatId = route.params.number; // [phone]
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

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; // [phone]
  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 QueryDocumentSnapshots.

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In addition, look at how your [phone] 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.