如何在firebase firestore Flatter中获取自动生成的文档id?
//这就是我试过的。 它不会返回我添加的最新或最后的数据如何在firebase firestore Flatter中获取自动生成的文档id?,firebase,flutter,google-cloud-firestore,Firebase,Flutter,Google Cloud Firestore,//这就是我试过的。 它不会返回我添加的最新或最后的数据 Future getData() async { var now = new DateTime.now(); var formatter = new DateFormat('yyyy-MM-dd'); String formatted = formatter.format(now); final FirebaseAuth firebaseAuth = FirebaseAuth.instance; f
Future getData() async {
var now = new DateTime.now();
var formatter = new DateFormat('yyyy-MM-dd');
String formatted = formatter.format(now);
final FirebaseAuth firebaseAuth = FirebaseAuth.instance;
final FirebaseUser user = await firebaseAuth.currentUser();
final uid = user.uid;
QuerySnapshot qn = await db
.collection('exams')
.document(uid)
.collection('intellective speed test')
.document('sensorimotor')
.collection('$formatted')
.where('createdAt', isLessThan: Timestamp.now().toDate().toString())
.getDocuments();
return qn.documents;
}
您可以从
DocumentSnapshot
for (int i = 0; i < querySnapshot.documents.length; i++) {
DocumentSnapshot docSnap = querySnapshot.documents.elementAt(i);
final id = docSnap.documentID;
}
在排序中使用本机
DateTime
应该可以。如果要查询最新或最后的数据,请按降序对字段排序,并限制为1
querySnapshot.documents.forEach((docSnap) {
final id = docSnap.documentID;
});