CODEWITHSUNDEEP
flutterdartgoogle-cloud-firestore
Ali Muloway
Ali Muloway

Reputation: 1

Flutter cloud firestore StreamBuilder<DocumentSnapshot> error

After updating my flutter plugin i had to update my code because I was receiving error like this 'Firestore' is deprecated and shouldn't be used. Class Firestore is deprecated, use 'FirebaseFirestore' instead..

I followed the warnings and update my code but now one my streamBuilders is not working I don't know why.

here my code

class PickupLayout extends StatelessWidget {


final Widget scaffold;
  final CallMethods callMethods = CallMethods();

  PickupLayout({
    @required this.scaffold,
  });

  @override
  Widget build(BuildContext context) {
    final UserProvider userProvider = Provider.of<UserProvider>(context);

return (userProvider != null && userProvider.getUser != null)
    ? StreamBuilder<DocumentSnapshot>(
        stream: callMethods.callStream(uid: userProvider.getUser.uid),
        builder: (context, snapshot) {
          if (snapshot.hasData && snapshot.data.data != null) {
            Call call = Call.fromMap(snapshot.data.data());

            if (!call.hasDialled) {
              return PickupScreen(call: call);
            }
          }
          return scaffold;
        },
      )
    : Scaffold(
        body: Center(
          child: CircularProgressIndicator(),
        ),
      );
  }
}

here is the error

════════ Exception caught by widgets library ═══════════════════════════════════
The following NoSuchMethodError was thrown building StreamBuilder<DocumentSnapshot>(dirty, state: _StreamBuilderBaseState<DocumentSnapshot, AsyncSnapshot<DocumentSnapshot>>#a2802):
The method '[]' was called on null.
Receiver: null
Tried calling: []("caller_id")
The relevant error-causing widget was
StreamBuilder<DocumentSnapshot>
package:vdb_tinus_app/…/pickup/pickup_layout.dart:22
When the exception was thrown, this was the stack
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1      new Call.fromMap
package:vdb_tinus_app/…/models/call.dart:37
#2      PickupLayout.build.<anonymous closure>
package:vdb_tinus_app/…/pickup/pickup_layout.dart:26
#3      StreamBuilder.build
package:flutter/…/widgets/async.dart:525
#4      _StreamBuilderBaseState.build

This the line with error according to log before updating my cloud firestore plung in it used to look like this if (snapshot.hasData && snapshot.data.data != null) { Call call = Call.fromMap(snapshot.data.data); after updating i had to change it to this if (snapshot.hasData && snapshot.data.data != null) { Call call = Call.fromMap(snapshot.data.data());

Upvotes: 0

Views: 528

Answers (2)

Timur
Timur

Reputation: 1343

In this part;

          if (snapshot.hasData && snapshot.data.data != null) {
        Call call = Call.fromMap(snapshot.data.data());

        if (!call.hasDialled) {
          return PickupScreen(call: call);
        }
      }

you should use this part like that;

if (snapshot.hasData && snapshot.data.data() != null) {

Apart from this project, You shouldn't try to make an video calling app if you are new to flutter. I know that you take this code from a video

Upvotes: 0

Riwen
Riwen

Reputation: 5190

In this line, if (snapshot.hasData && snapshot.data.data != null) {, you are checking whether DocumentSnapshot.data is null. Since it is a function (therefore, an object), your comparison never evaluates as false.

In the next line, snapshot.data.data(), you are calling the above function, whose return value might very well be null.

Upvotes: 1

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