Map an Array of objects from Firebase to List Flutter - firebase

Question

I'm trying to retrieve an array of objects from Firebase and store it in Flutter Object as a List.
This is the collection, Firebase,
And this is the model class
class Merchant {
String shopName;
String address;
String description;
String thumbNail;
LatLng locationCoords;
Merchant(
{this.shopName,
this.address,
this.description,
this.thumbNail,
this.locationCoords});
}
final List<Merchant> merchant = []; // Map it to This List
I'd like to map it into this list above
final List<Merchant> merchant = [];

Answer 1

First add this method to your Merchant class:
Merchant.fromMap(Map<String, dynamic> map) {
shopName = map['shopName'];
address = map['address'];
description = map['description'];
thumbnail = map['thumbnail'];
locationCoords = map['locationCoords'];
}
This method will then be used to write the data into the Merchant Class/Struct.
Retrieving the data the could look something like the following:
import 'package:cloud_firestore/cloud_firestore.dart';
FirebaseFirestore _firestore = FirebaseFirestore.instance;
CollectionReference merchRef = _firestore.collection('merchants'));
Future<List<Merchant>> getAllMerchants() async {
List<Merchant> merchantList = [];
await merchRef.get().then((QuerySnapshot querySnapshot) {
querySnapshot.docs.forEach((doc) {
Merchant merchant = Merchant.fromMap({
'shopName': doc['shopname'],
'address': doc['address'],
'description': doc['description'],
'thumbnail': doc['thumbnail'],
'locationCoords': doc['location'],
});
merchantList.add(merchant);
});
});
return merchantList;
}
P.S.:
Haven´t tried this out yet and you might need some parsing for locationCoords, since it is of type LatLng.