How do I access separate children from Firebase database in Flutter? - database

Question

Hi I am currently trying to access a child of my database in Flutter so that I can link it to another child. I am able to pull the data from one child, but unable to link this data with my other child. I want to be able to access a field of the 'Record' child and link to the 'Volunteer' child using the "volunteer" field but am unable to get them to link together. Any help would be appreciated!
The database structure is as follows:
This is the code for My Volunteer class:
class Volunteer {
String volunteerID;
String name;
String role;
Volunteer(this.volunteerID, this.name, this.role);
Volunteer.fromSnapshot(DataSnapshot snapshot)
: volunteerID = snapshot.key,
name = snapshot.value["name"],
role = snapshot.value["role"];
toJson() {
return {
"key": volunteerID,
"name": name,
"role": role
};
}
}
And this is the code for my UI:
class SignInPageState extends State<SignInPage> {
List<Volunteer> volunteers;
Volunteer volunteer;
DatabaseReference dbRef;
DatabaseReference volunteerRef;
DatabaseReference recordRef;
#override
void initState() {
super.initState();
volunteers = new List();
volunteer = Volunteer("","", "");
final FirebaseDatabase database = FirebaseDatabase.instance;
dbRef = database.reference();
volunteerRef = database.reference().child('volunteer');
recordRef = database.reference().child('record');
dbRef.onChildAdded.listen(_onEntryAdded);
dbRef.onChildChanged.listen(_onEntryChanged);
volunteerRef.once().then((DataSnapshot snapshot) {
Map<dynamic, dynamic> getMap = snapshot.value;
getMap.forEach((key, values) {
String volunteerRecord = recordRef.child('volunteer').toString();
if (volunteerRecord == volunteer.volunteerID){
volunteer.role = volunteerRecord;
}
volunteers.add(volunteer);
});
});
}
_onEntryAdded(Event event) {
setState(() {
volunteers.add(Volunteer.fromSnapshot(event.snapshot));
});
}
_onEntryChanged(Event event) {
var old = volunteers.singleWhere((entry) {
return entry.volunteerID == event.snapshot.key;
});
setState(() {
volunteers[volunteers.indexOf(old)] = Volunteer.fromSnapshot(event.snapshot);
});
}
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Container(
padding: EdgeInsets.all(10.0),
color: Colors.white,
child: Column(
children: <Widget>[
Expanded(
flex: 8,
child: Container(
child: FirebaseAnimatedList(
query: volunteerRef,
itemBuilder: (BuildContext context, DataSnapshot snapshot,
Animation<double> animation, int index) {
return new ListTile(
title: Text(
(volunteers[index].name + " " + volunteers[index].role),
textAlign: TextAlign.center,
overflow: TextOverflow.ellipsis,
style: TextStyle(fontWeight: FontWeight.bold ,color: Color.fromRGBO(139, 195, 68, 1)),
),
onTap: () {
SuccessSignInPage(volunteers[index].name);
},
);
},
),
)
),
],
)),
),
);
}
void Back() async {
await Navigator.of(context).pop();
}
void SuccessSignInPage(String name) async {
var route = new MaterialPageRoute(
builder: (BuildContext context) => new SignInSuccessPage(value: name));
await Navigator.of(context).push(route);
}
}