[英]How to create sub collection to firebase firestore document
有沒有辦法在 set() 方法之后創建子集合，如下所示？
CollectionReference ref1 =
FirebaseFirestore.instance.collection('chatrooms');
await ref1
.doc(chatroom)
.set({"chatid": chatroom})
.collection('messages')
.add({"message": _message.text});
CollectionReference ref1 =
FirebaseFirestore.instance.collection('chatrooms');
await ref1.doc('doc').set({"chatid": chatroom});
await ref1
.doc('doc')
.collection('messages')
.add({"message": _message.text});
你可以這樣拆分
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