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[英]How can i bind data from firestore collection to a dropdownfromfield in flutter?
[英]How can i filter firestore data by a field in another collection in flutter
数据库视图我试图将字段值分配给局部变量,但它不起作用
getData() async {
String userId = 'userId';
Firestore.instance.collection('user').document(userId).snapshots();
var snapshot;
var userDocument = snapshot.data;
String _myAddress = userDocument["address"];
return Firestore.instance
.collection('letters')
.where("source Box", isEqualTo: _myAddress)
.snapshots();
}
你应该让你的问题更清楚,但我已经尝试用你的代码修复一些明显的问题。
getData() async {
String userId = 'userId';
var userDocument = await Firestore.instance.collection('user').document(userId).get();
String _myAddress = userDocument["address"];
return Firestore.instance
.collection('letters')
.where("source Box", isEqualTo: _myAddress)
.snapshots();
}
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