type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast #351

HerrNiklasRaab · 2018-10-20T14:03:15Z

I get following error, when i want to deserialize an object with a property of type List<> containing another serializeable object. If i change "ChatMember.fromJson(e as Map<String, dynamic>)" to "Map<String, dynamic>.from(e)" everything works perfect. Can you fix this, is there any workaround possible so i can continue my work?

E/flutter (21470): [ERROR:flutter/shell/common/shell.cc(181)] Dart Error: Unhandled exception:
E/flutter (21470): type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast
E/flutter (21470): #0      Object._as (dart:core/runtime/libobject_patch.dart:78:25)
E/flutter (21470): #1      _$ChatFromJson.<anonymous closure> (file:///C:/Flutter/src/hapi/lib/datamodels/chat.g.dart:13:56)
E/flutter (21470): #2      MappedListIterable.elementAt (dart:_internal/iterable.dart:414:29)
E/flutter (21470): #3      ListIterable.toList (dart:_internal/iterable.dart:219:19)
E/flutter (21470): #4      _$ChatFromJson (file:///C:/Flutter/src/hapi/lib/datamodels/chat.g.dart:14:13)
E/flutter (21470): #5      new Chat.fromJson (package:hapi/datamodels/chat.dart:22:55)
E/flutter (21470): #6      ChatsModel.getChats.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:hapi/models/chats_model.dart:24:72)
E/flutter (21470): #7      FirestoreHelper.fromListToMap.<anonymous closure> (package:hapi/framework/helper/firestorehelper.dart:8:36)
E/flutter (21470): #8      MapBase._fillMapWithMappedIterable (dart:collection/maps.dart:67:32)
E/flutter (21470): #9      new LinkedHashMap.fromIterable (dart:collection/linked_hash_map.dart:124:13)
E/flutter (21470): #10     FirestoreHelper.fromListToMap (package:hapi/framework/helper/firestorehelper.dart:6:16)
E/flutter (21470): #11     ChatsModel.getChats.<anonymous closure>.<anonymous closure> (package:hapi/models/chats_model.dart:24:31)
E/flutter (21470): #12     _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
E/flutter (21470): #13     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
E/flutter (21470): #14     _DelayedData.perform (dart:async/stream_impl.dart:591:14)
E/flutter (21470): #15     _StreamImplEvents.handleNext (dart:async/stream_impl.dart:707:11)
E/flutter (21470): #16     _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:667:7)
E/flutter (21470): #17     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
E/flutter (21470): #18     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)

// GENERATED CODE - DO NOT MODIFY BY HAND

part of 'chat.dart';

// **************************************************************************
// JsonSerializableGenerator
// **************************************************************************

Chat _$ChatFromJson(Map<String, dynamic> json) {
  return Chat(
      members: (json['members'] as List)
          ?.map((e) =>
              e == null ? null : ChatMember.fromJson(e as Map<String, dynamic>))
          ?.toList(),
      memberIds: (json['memberIds'] as List)?.map((e) => e as String)?.toList())
    ..creation = json['creation'] == null
        ? null
        : DateTime.parse(json['creation'] as String)
    ..lastUpdate = json['lastUpdate'] == null
        ? null
        : DateTime.parse(json['lastUpdate'] as String);
}

Map<String, dynamic> _$ChatToJson(Chat instance) => <String, dynamic>{
      'creation': instance.creation?.toIso8601String(),
      'lastUpdate': instance.lastUpdate?.toIso8601String(),
      'members': instance.members,
      'memberIds': instance.memberIds
    };

The text was updated successfully, but these errors were encountered:

HerrNiklasRaab · 2018-10-20T15:18:46Z

Workaround:

  factory Chat.fromJson(Map<String, dynamic> json) {
    json["members"] = (json['members'] as List)
          ?.map((e) =>
              e == null ? null : Map<String, dynamic>.from(e))
          ?.toList();
     return _$ChatFromJson(json);  
  }

kevmoo · 2018-10-20T19:39:36Z

Duplicate of flutter/flutter#17417 – I'll try to take a look today...

kevmoo · 2018-10-20T19:42:12Z

Actually, it looks like the map is coming from package:hapi – not sure what that is.

You can configure your generator to use anyMap – see https://pub.dartlang.org/packages/json_serializable under Build Configuration – set any_map: true and you should be good!

Or change your map generation to create Map<String, dynamic> instead of Map<dynamic, dynamic>

HerrNiklasRaab · 2018-10-20T21:28:16Z

Tried any_map: true. But this didn't changed anything. Only working with the provided workaround.

kevmoo · 2018-10-20T22:22:32Z

Glad you figured it out!

HerrNiklasRaab · 2018-10-21T14:59:56Z

@kevmoo Sorry, for the unclear answer. Setting any_map: true didn't change anything, this did not solved my problem.

kevmoo · 2018-10-21T17:56:21Z

If the generated code didn't change at all, then you likely have something wrong with your configuration.

ajplumlee33 · 2018-12-24T08:53:27Z

I couldn't get any_map to work either. However, I tried nullable: false and that fixed the problem for me

pujitm · 2018-12-25T23:04:45Z

neither nullable: false nor anyMap: true worked for me, but the original workaround did.

In my case, I had a Map of another serializable object. My workaround in the fromJson method was as follows:

json["owner"] = Map<String, dynamic>.from(json["owner"]);

lukepighetti · 2019-02-22T19:50:36Z

Running into this now. It's immediately apparent when trying to serialize JSON from firebase_database for some reason.

lukepighetti · 2019-02-22T19:53:55Z

type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast

None of these works.

Print statement shows a map coming through.

      contentRef(schemaKey)
          .child(entryId)
          .once()
          .then((snap) => Entry.fromJson(snap.value.cast<String, dynamic>()));

      contentRef(schemaKey)
          .child(entryId)
          .once()
          .then((snap) => Entry.fromJson(Map.from(snap.value)));

      contentRef(schemaKey).child(entryId).once().then(
          (snap) => Entry.fromJson(Map<String, dynamic>.from(snap.value)));

using

  firebase_database: ^2.0.1+1
  json_serializable: ^2.0.2

kevmoo · 2019-02-24T22:42:30Z

See flutter/flutter#17417 – please add a 👍 there to encourage the flutter folks to run on it

lukepighetti · 2019-02-25T01:58:04Z

Thanks @kevmoo , I was able to move forward by using any_map: true and switching to MyClass.fromJson(Map json) instead of MyClass.fromJson(Map<String, dynamic> json)

agueroveraalvaro · 2019-06-14T23:47:10Z

Only this was my solution

    Map data = jsonDecode(result.body);
    List<dynamic> list = List();
    list = data["result"].map((result) => new MyModel.fromJson(result)).toList();

    for(int b=0;b<list.length;b++)
    {
      MyModel myModel = list[b] as MyModel;
      _add(myModel);
    }

factory MyModel.fromJson(Map<String, dynamic> json) {
    return new MyModel(
      id: json['id'],
      name: json['name']
    );
  }

rv786 · 2019-07-31T20:57:26Z

neither nullable: false nor anyMap: true worked for me, but the original workaround did.

In my case, I had a Map of another serializable object. My workaround in the fromJson method was as follows:

json["owner"] = Map<String, dynamic>.from(json["owner"]);

The best idea to Fix The Error
Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'List<Map<String, dynamic>>' in type cast
From jsonDecode("[]") as List<Map<String, dynamic>> To List<Map<String, dynamic>>.from(jsonDecode("[]"))

eeeeeson · 2019-08-01T02:28:52Z

When argument data pass through by MethodChannel or EventChannel. we should use codec JSONMethodCodec which will ensure type as Map<String, dynamic> automatically.

kevmoo · 2019-08-01T03:41:59Z

I think the issue is related to flutter/flutter#17417 (comment)

…

On Wed, Jul 31, 2019 at 7:28 PM esonchen ***@***.***> wrote: When argument data pass through by MethodChannel or EventChannel. we should use codec *JSONMethodCodec* which will ensure type as Map<String, dynamic> automatically. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#351>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAEFCTIAD62YE4G2HJRC23QCJC6JANCNFSM4F6HYP6A> .

zemunkh · 2020-08-30T15:14:31Z

Workaround:

  factory Chat.fromJson(Map<String, dynamic> json) {
    json["members"] = (json['members'] as List)
          ?.map((e) =>
              e == null ? null : Map<String, dynamic>.from(e))
          ?.toList();
     return _$ChatFromJson(json);  
  }

Thanks, I skipped this answer almost 10 times. You saved my life. Huge appreciate. 👍

lukepighetti · 2021-02-23T02:18:47Z

This problem is still apparent and it's very annoying. If you try to unwrap any nested maps from Realtime Database it falls apart. Furthermore, the errors provided for some reason do not show stack into json_serializable, so it's very difficult to track down the source.

kevmoo · 2021-02-23T02:34:13Z

firebase/flutterfire#833 Was this fixed? There's nothing to do here, sady...

…

On Mon, Feb 22, 2021 at 6:19 PM Luke Pighetti ***@***.***> wrote: This problem is still apparent and it's very annoying. If you try to unwrap any maps from Realtime Database it falls apart. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#351 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAEFCS5YW6R3Q72FNLDJD3TAMGBJANCNFSM4F6HYP6A> .

lukepighetti · 2021-02-23T11:28:13Z

Just for the sake of my understanding, is there any reason why json_serializable can't do a Map<String,dynamic>.from() when it's expecting a map? Would that resolve the issue?

I suspect I'm going to have to make a visitor to mutate nested maps into Map<String,dynamic> to coerce these realtime database response objects into something palatable for json_serializable

lukepighetti · 2021-02-23T12:06:38Z

If I edit the json_serliazble code to change e as Map<String,dynamic> to Map<String,dynamic>.from(e) it works as expected

As implemented

_$_FBList _$_$_FBListFromJson(Map<String, dynamic> json) {
  return _$_FBList(
    info: json['info'] == null
        ? null
        : FBListInfo.fromJson(json['info'] as Map<String, dynamic>),
    members: (json['members'] as Map<String, dynamic>)?.map(
      (k, e) => MapEntry(k,
          e == null ? null : FBListMember.fromJson(e as Map<String, dynamic>)),
    ),
    items: (json['items'] as Map<String, dynamic>)?.map(
      (k, e) => MapEntry(
          k, e == null ? null : FBListItem.fromJson(e as Map<String, dynamic>)),
    ),
  );
}

Change to allow toJson to work with realtime database response objects.

_$_FBList _$_$_FBListFromJson(Map<String, dynamic> json) {
  return _$_FBList(
    info: json['info'] == null
        ? null
        : FBListInfo.fromJson(json['info'] as Map<String, dynamic>),
    members: (json['members'] as Map<String, dynamic>)?.map(
      (k, e) => MapEntry(
          k,
          e == null
              ? null
              : FBListMember.fromJson(Map<String, dynamic>.from(e))),
    ),
    items: (json['items'] as Map<String, dynamic>)?.map(
      (k, e) => MapEntry(k,
          e == null ? null : FBListItem.fromJson(Map<String, dynamic>.from(e))),
    ),
  );
}

lukepighetti · 2021-02-23T12:18:32Z

I was able to get it to work with a combination of things

any_map: true

factory FBList.fromJson(Map<String, dynamic> json) => _$FBListFromJson(json);

FBList.fromJson(Map.from(listPayload))

But I am still curious to hear your thoughts about the solution in my previous comment.

kevmoo · 2021-02-23T18:25:03Z

Yeah any_may is your best bet here.

The problem w/ your proposal is it copies data unnecessarily. I guess we could do a cast. But it drives me nuts to create these types of work-arounds for other folks code.

lukepighetti · 2021-02-24T00:00:38Z

I'm going to consider this resolved, thanks for the reply.

exeptionerror · 2021-04-12T16:36:02Z

[Solved] Unhandled Exception: InternalLinkedHashMap‘ is not a subtype of type ‘List

JanobA99 · 2021-08-18T12:02:12Z

Actually, it looks like the map is coming from package:hapi – not sure what that is.

You can configure your generator to use anyMap – see https://pub.dartlang.org/packages/json_serializable under Build Configuration – set any_map: true and you should be good!

Or change your map generation to create Map<String, dynamic> instead of Map<dynamic, dynamic>

thanks bro

stanley-shavy · 2023-02-19T08:21:00Z

create UserData class then pass data without the <String, dynamic>
UserData.fromRTDB(Map data)

The data after fetching should be the same cast it to map without the <String, dynamic>
final data = snapshot.value as Map;
final userI = UserData.fromRTDB(data);

kevmoo closed this as completed Oct 20, 2018

kevmoo mentioned this issue Jul 4, 2020

Map<String, double> generated wrong. #664

Closed

peterwvj mentioned this issue Jul 5, 2020

Problem constructing products from json openfoodfacts/openfoodfacts-dart#30

Closed

BaudouinCS mentioned this issue Nov 7, 2022

Cast Error heftapp/graphql_codegen#198

Closed

jpnurmi mentioned this issue Dec 14, 2022

LXD: enable any_map for json_serializable canonical/workshops#295

Merged

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type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast #351

type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast #351

HerrNiklasRaab commented Oct 20, 2018

HerrNiklasRaab commented Oct 20, 2018

kevmoo commented Oct 20, 2018

kevmoo commented Oct 20, 2018

HerrNiklasRaab commented Oct 20, 2018

kevmoo commented Oct 20, 2018

HerrNiklasRaab commented Oct 21, 2018

kevmoo commented Oct 21, 2018

ajplumlee33 commented Dec 24, 2018

pujitm commented Dec 25, 2018

lukepighetti commented Feb 22, 2019 •

edited

lukepighetti commented Feb 22, 2019

kevmoo commented Feb 24, 2019

lukepighetti commented Feb 25, 2019 •

edited

agueroveraalvaro commented Jun 14, 2019 •

edited

rv786 commented Jul 31, 2019

eeeeeson commented Aug 1, 2019

kevmoo commented Aug 1, 2019 via email

zemunkh commented Aug 30, 2020

lukepighetti commented Feb 23, 2021 •

edited

kevmoo commented Feb 23, 2021 via email

lukepighetti commented Feb 23, 2021 •

edited

lukepighetti commented Feb 23, 2021 •

edited

lukepighetti commented Feb 23, 2021 •

edited

kevmoo commented Feb 23, 2021

lukepighetti commented Feb 24, 2021

exeptionerror commented Apr 12, 2021

JanobA99 commented Aug 18, 2021

stanley-shavy commented Feb 19, 2023

type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast #351

type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast #351

Comments

HerrNiklasRaab commented Oct 20, 2018

HerrNiklasRaab commented Oct 20, 2018

kevmoo commented Oct 20, 2018

kevmoo commented Oct 20, 2018

HerrNiklasRaab commented Oct 20, 2018

kevmoo commented Oct 20, 2018

HerrNiklasRaab commented Oct 21, 2018

kevmoo commented Oct 21, 2018

ajplumlee33 commented Dec 24, 2018

pujitm commented Dec 25, 2018

lukepighetti commented Feb 22, 2019 • edited

lukepighetti commented Feb 22, 2019

kevmoo commented Feb 24, 2019

lukepighetti commented Feb 25, 2019 • edited

agueroveraalvaro commented Jun 14, 2019 • edited

rv786 commented Jul 31, 2019

eeeeeson commented Aug 1, 2019

kevmoo commented Aug 1, 2019 via email

zemunkh commented Aug 30, 2020

lukepighetti commented Feb 23, 2021 • edited

kevmoo commented Feb 23, 2021 via email

lukepighetti commented Feb 23, 2021 • edited

lukepighetti commented Feb 23, 2021 • edited

lukepighetti commented Feb 23, 2021 • edited

kevmoo commented Feb 23, 2021

lukepighetti commented Feb 24, 2021

exeptionerror commented Apr 12, 2021

JanobA99 commented Aug 18, 2021

stanley-shavy commented Feb 19, 2023

lukepighetti commented Feb 22, 2019 •

edited

lukepighetti commented Feb 25, 2019 •

edited

agueroveraalvaro commented Jun 14, 2019 •

edited

lukepighetti commented Feb 23, 2021 •

edited

lukepighetti commented Feb 23, 2021 •

edited

lukepighetti commented Feb 23, 2021 •

edited

lukepighetti commented Feb 23, 2021 •

edited