我正在try 创建一个包含Firebase文档的列表流. 这是我目前的功能:
Future<List<Service>> getServicesById(id) async {
List<Service> services = [];
for (String ids in id) {
FirebaseFirestore.instance
.collection('Services')
.doc(ids)
.get()
.then((value) {
services.add(Service.fromJson(value.data()!));
});
}
return services;
}
如何将其传输到流中，并返回服务列表？
如下所示更改您的方法:
Stream<Service> getServicesById(List<String> ids) async* {
for (String id in ids) {
final DocumentSnapshot document = await FirebaseFirestore.instance
.collection('Services')
.doc(id)
.get();
yield Service.fromJson(document.data()!);
}
}
如果您想立即退货:
Stream<List<Service>> getServicesById(List<String> ids) async* {
List<Service> services = [];
for (String id in ids) {
final DocumentSnapshot document = await FirebaseFirestore.instance
.collection('Services')
.doc(id)
.get();
if (document.exists) {
services.add(Service.fromJson(document.data()!));
}
}
// Yield the list of services when the loop is done
yield services;
}