Firebase Realtime database serialization in Flutter - flutter

Question

I'm struggling a bit with getting data I push to Firebase Realtime DB in Flutter.
I'm using this code to push data to FB:
DatabaseReference newPostRef = news_dbRef.push();
final newKey = news_dbRef.child('News').push().key;
newPostRef.set({
"timestamp": timestamp,
"content": content_u,
"title": title_u,
"imgURL": imageUrl_u.substring(0,imageUrl_u.lastIndexOf('?')),
"fileURL": fileUrl_u.substring(0,fileUrl_u.lastIndexOf('?')),
"user": _user
});
so it creates a desired object in Firebase like this:
screenshot from Firebase
Now when I'm trying to get this data to my app, I'm having issues with proper serialization with it.
This is what I'm doing:
DatabaseReference newsCountRef =
FirebaseDatabase.instance.ref().child('News');
newsCountRef.onValue.listen((DatabaseEvent event) {
var data = event.snapshot.value;
String encoded = jsonEncode(data);
Map<String, dynamic> postslist = jsonDecode(encoded);
var somelist = postslist.entries.map((e) => TestNewsModel(e.key, e.value)).toList();
so it brings me to a stage that I have a list... but cannot read values for each line.
Do you have any ideas what I'm missing? Here's a class I'm using for serialization:
class TestNewsModel {
String recordid;
dynamic fields;
TestNewsModel(this.recordid, this.fields);
String toString() {
return '{ ${this.recordid}, ${this.fields} }';
}
}
class Field {
String timestamp;
String content;
String title;
String imgURL;
String fileURL;
String user;
Field({
required this.timestamp,
required this.content,
required this.title,
required this.imgURL,
required this.fileURL,
required this.user,
});
String toString() {
return '{ ${this.timestamp}, ${this.content}, ${this.title}, ${this.imgURL}, ${this.fileURL}, ${this.user} }';
}}

Answer 1

Would recommend creating a .fromDoc method in your class, similar to how you would create a .fromJson method.
Heres an example from one of my projects, this way you can avoid encoding and decoding.
///Creates a [Patient] from the information from a single firestore doc.
factory Patient.fromDoc(doc) {
return Patient(
doc.data()['email'],
doc.data()['forename'],
doc.data()['surname'],
doc.data()['hospitalNum'].toString(),
doc.id,
);
}