这是我当前正在使用的设置:
class BookList extends StatelessWidget {
@override
Widget build(BuildContext context) {
return StreamBuilder<QuerySnapshot>(
stream: Firestore.instance.collection('books').snapshots(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (snapshot.hasError)
return new Text('Error: ${snapshot.error}');
switch (snapshot.connectionState) {
case ConnectionState.waiting: return new Text('Loading...');
default:
return new ListView(
children: snapshot.data.documents.map((DocumentSnapshot document) {
return new ListTile(
title: new Text(document['title']),
subtitle: new Text(document['author']),
);
}).toList(),
);
}
},
);
}
}
当我想获取特定文档时,我读到了以下示例:
Firestore.instance
.collection('talks')
.document('document-name')
.get()
.then((DocumentSnapshot ds) {
// use ds as a snapshot
});
问题是我不知道如何在我的Streambuilder中使用该示例。当我尝试这样做时:
...
body: StreamBuilder<QuerySnapshot>(
stream: Firestore.instance
.collection('talks')
.document('document-name')
.get()
.then((DocumentSnapshot ds) {
// use ds as a snapshot
}),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (snapshot.data == null)
return Center(child: CircularProgressIndicator());
if (snapshot.hasError) return new Text('Error: ${snapshot.error}');
if (snapshot.data.documents.length == 0)
...
我知道了
参数类型'Future'不能分配给参数类型'Stream'.dart(argument_type_not_assignable)
答案 0 :(得分:0)
在Firestore的Flutter库中,您可以通过调用DocumentReference.snapshots()
method来获取单个文档流。
类似这样:
stream: Firestore.instance.collection('books').document('document-name').snapshots(),