I am trying to get all the documents related to a collection from Firestore, but it returns null. The below code is working for the users collection (retrieving only one user), but for masterclasses not.
This is my Firestore database:
And the code related to it:
import 'dart:developer';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:womanverse/model/masterclass.dart';
import 'package:womanverse/model/user.dart';
class DatabaseService {
final String? uid;
DatabaseService ({ this.uid });
final CollectionReference userCollection = FirebaseFirestore.instance.collection('users');
final CollectionReference masterclassesCollection = FirebaseFirestore.instance.collection('masterclasses');
Future updateUserData(String email, String name, String phoneNumber, bool isSubscribed) async {
return userCollection.doc(uid).set({
'email' : email,
'name' : name,
'phoneNumber' : phoneNumber,
'isSubscribed' : isSubscribed,
});
}
Future updateName(String name) async {
return userCollection.doc(uid).update({
'name' : name,
});
}
Future updateEmail(String email) async {
return userCollection.doc(uid).update({
'email' : email,
});
}
Future updatePhoneNumber(String phoneNumber) async {
return userCollection.doc(uid).update({
'phoneNumber' : phoneNumber,
});
}
Future updateSubscribe(bool subscribe) async {
return userCollection.doc(uid).update({
'isSubscribed' : subscribe,
});
}
//user from Document
MyUser userFromDocument (DocumentSnapshot snapshot){
var sn = snapshot.data() as Map<String, dynamic>;
return MyUser(
uid: sn['uid'],
name: sn['name'],
email: sn['email'],
phoneNumber: sn['phoneNumber'],
isSubscribed: sn['isSubscribed']
);
}
Stream<MyUser> get mySingleUser {
return userCollection.doc(uid).snapshots().map(userFromDocument);
}
List<Masterclass> masterclassesConvert (QuerySnapshot snapshot) {
return snapshot.docs.map((doc){
return Masterclass(
uid: doc.get('uid') ?? "",
authorImage: doc.get('authorImage') ?? "",
authorName: doc.get('authorName') ?? "",
classImage: doc.get('classImage') ?? "",
className: doc.get('className') ?? ""
);
}).toList();
}
Stream<List<Masterclass>> get masterclasses {
return masterclassesCollection.snapshots().map(masterclassesConvert);
}
}
I am using Stream Provider to listen any changes for masterclass collection:
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:persistent_bottom_nav_bar/persistent-tab-view.dart';
import 'package:provider/provider.dart';
import 'package:sizer/sizer.dart';
import 'package:womanverse/db/firestore_database.dart';
import 'package:womanverse/model/masterclass.dart';
import 'package:womanverse/pages/home/masterclasses/learnmore.dart';
import 'package:womanverse/pages/home/masterclasses/session.dart';
import 'package:womanverse/pages/home/masterclasses/education_sessions_list.dart';
class Education extends StatelessWidget {
const Education({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
//precacheImage(const AssetImage("assets/background-marmura.png"), context);
return StreamProvider<List<Masterclass>>.value(
value: DatabaseService().masterclasses,
initialData: const [],
child: Sizer(
builder: (context, orientation, deviceType) {
return Scaffold(
body: SafeArea(
child: SingleChildScrollView(
child: Column(
children: [
SizedBox(height:7.h),
Container(
margin: const EdgeInsets.fromLTRB(20, 0, 20, 0),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Flexible(
child: Text("ELITE MASTERCLASSES",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: SizerUtil.deviceType == DeviceType.mobile ? 20.sp : 17.sp,
letterSpacing: 3,
color: const Color(0xff393432),
fontFamily: 'RoyaleBold',
),)
),
],
),
),
SizedBox(height:3.h),
ElevatedButton(
style: ButtonStyle(
padding: MaterialStateProperty.all(EdgeInsets.fromLTRB(3.w, 1.h, 3.w, 1.h)),
elevation: MaterialStateProperty.all(5), //Defines Elevation
backgroundColor: MaterialStateProperty.all(const Color(0xffE4BCB4)),
shape: MaterialStateProperty.all<RoundedRectangleBorder>(
RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
)
)
),
onPressed: () {
pushNewScreen(context,
screen: const LearnMore(),
withNavBar: true,
pageTransitionAnimation: PageTransitionAnimation.slideRight);
},
child: Text("LEARN MORE",
style: TextStyle(
color: const Color(0xff393432),
fontSize: SizerUtil.deviceType == DeviceType.mobile ? 10.sp : 9.sp,
fontWeight: FontWeight.bold,
)
),
),
SizedBox(height: 2.h),
Container(
margin: const EdgeInsets.fromLTRB(10, 0, 0, 0),
child: SizedBox(
height: 35.h,
child: const SessionsList(),
),
),
SizedBox(height: 7.h),
Container(
width: 100.w,
color: Colors.black,
padding: const EdgeInsets.all(20),
child: Column(
children: [
Row(
children: [
Text("NFT",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: SizerUtil.deviceType == DeviceType.mobile ? 20.sp : 17.sp,
letterSpacing: 3,
color: Colors.white,
fontFamily: 'RoyaleBold',
),),
],
),
SizedBox(height: 2.h),
Row(
children: [
Stack(
children:[
SizedBox(
width: 100.w - 40,
height: 30.h,
child: Card(
semanticContainer: true,
clipBehavior: Clip.antiAliasWithSaveLayer,
child: Image.asset(
'assets/background-marmura.png',
fit: BoxFit.fill,
),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
),
elevation: 5,
margin: const EdgeInsets.all(10),
),
),
Positioned(
bottom: 20,
right: 25,
child: OutlinedButton(
onPressed: () {
},
style: OutlinedButton.styleFrom(
padding: const EdgeInsets.fromLTRB(17, 13, 17, 13),
primary: const Color(0xffE4BCB4),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(
10.0),
),
side: const BorderSide(
width: 2, color: Color(0xff393432)),
),
child: Text(
'GO TO SESSION',
style: TextStyle(
color: const Color(0xff393432),
fontSize: SizerUtil.deviceType == DeviceType.mobile ? 10.sp : 8.sp,
fontWeight: FontWeight.w700,
)
),
),
),
],
),
],
)
],
),
),
],
)
),
)
);
}
),
);
}
}
Where I listen to:
import 'dart:developer';
import 'package:flutter/material.dart';
import 'package:persistent_bottom_nav_bar/persistent-tab-view.dart';
import 'package:provider/provider.dart';
import 'package:sizer/sizer.dart';
import 'package:womanverse/model/masterclass.dart';
import 'package:womanverse/pages/home/masterclasses/session.dart';
class SessionsList extends StatefulWidget {
const SessionsList({Key? key}) : super(key: key);
@override
State<SessionsList> createState() => _SessionsListState();
}
class _SessionsListState extends State<SessionsList> {
createSessionThumbnail(String image, Widget newPage, context) {
print("asda");
return Stack(
children:[
SizedBox(
width: 75.w,
height: 35.h,
child: Card(
semanticContainer: true,
clipBehavior: Clip.antiAliasWithSaveLayer,
child: Image.network(
image,
fit: BoxFit.fill,
),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
),
elevation: 5,
margin: const EdgeInsets.all(10),
),
),
Positioned(
bottom: 20,
right: 30,
child: OutlinedButton(
onPressed: () {
pushNewScreen(context,
screen: newPage,
withNavBar: true,
pageTransitionAnimation: PageTransitionAnimation.slideRight);
},
style: OutlinedButton.styleFrom(
padding: const EdgeInsets.fromLTRB(17, 13, 17, 13),
primary: const Color(0xffE4BCB4),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(
10.0),
),
side: const BorderSide(
width: 2, color: Color(0xff393432)),
),
child: Text(
'GO TO SESSION',
style: TextStyle(
color: const Color(0xff393432),
fontSize: SizerUtil.deviceType == DeviceType.mobile ? 10.sp : 8.sp,
fontWeight: FontWeight.w700,
)
),
),
),
],
);
}
@override
Widget build(BuildContext context) {
log("aaaa");
final masterclasses = Provider.of<List<Masterclass>>(context);
log("a");
return ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: masterclasses.length,
itemBuilder: (BuildContext ctx, int index) {
print("aa");
return createSessionThumbnail(masterclasses[index].classImage!, const Session(), ctx);
},
);
}
}
CodePudding user response：
I solved this issue by changing
List<Masterclass> masterclassesConvert (QuerySnapshot snapshot) {
return snapshot.docs.map((doc){
return Masterclass(
uid: doc.data().toString().contains('uid') ? doc.get('uid') : '',
authorImage: doc.data().toString().contains('authorImage') ? doc.get('authorImage') : '',
authorName: doc.data().toString().contains('authorName') ? doc.get('authorName') : '',
classImage: doc.data().toString().contains('classImage') ? doc.get('classImage') : '',
className: doc.data().toString().contains('className') ? doc.get('className') : '',
);
}).toList();
}
Somehow, the latest version of Firestore, should have this check: doc.data().toString().contains('authorImage')