Flutter 转换 Future<T> 列出<T>

Question

I want to convert following

Future<UserDetl> f = AppDatabase().userById('55e62a90-273c-11ea-9441-f75d5cd0114b');

into List<UserDetl> lstUser

class UserDetl {
  String userId;
  String userName;
  String userPlace;
  String userUrl;

  UserDetl(this.userId,this.userName, this.userPlace, this.userUrl);

}

and I wanna get username from the list

String user = lstUser[0].userName;

Answer 1

try this !

getUser() async {

UserDetl tmp = await  AppDatabase().userById('55e62a90-273c-11ea-9441-f75d5cd0114b');

if(tmp!=null)
 setState((){
    UserDetl u = v;
});
}

Answer 2

You simply have to build a list with your result:

Future<UserDetl> f = AppDatabase().userById('55e62a90-273c-11ea-9441-f75d5cd0114b');
UserDetl user = await f;
List<UserDetl> lstUser = [user];

Answer 3

Future<UserDetl> f = //get your Futuredata
UserDetl user = await f;
List<UserDetl> lstUser = [user];//add in list

//you also can get it from list like:

UserDetl user = lstUser[0];