Generated argument for nullable argument in fromJson is not nullable

[nzackoya]

For example we have fromJson for a field:

@JsonKey(fromJson: _latLngFromJson)
  final LatLng? location;

so generating from this

_latLngFromJson(Map<String, dynamic>? geoPoint)

we get non nullable

..location =
        UserRecord._latLngFromJson(json['location'] as Map<String, dynamic>)

Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, 2.0.5, on macOS 11.2.3 20D91 darwin-x64, locale en-GB) [✓] Android toolchain - develop for Android devices (Android SDK version 30.0.0) [✓] Xcode - develop for iOS and macOS [✓] Chrome - develop for the web [✓] Android Studio (version 4.1) [✓] Connected device (2 available)

flutter pub deps -- --style=compact Dart SDK 2.12.3 Flutter SDK 2.0.5

dependencies:

• app_tracking_transparency 2.0.0 [flutter]
• cached_network_image 3.0.0 [flutter flutter_cache_manager octo_image]
• cloud_firestore 1.0.7 [cloud_firestore_platform_interface cloud_firestore_web firebase_core firebase_core_platform_interface flutter meta]
• country_code_picker 2.0.1 [flutter modal_bottom_sheet collection universal_platform]
• country_currency_helper 0.0.3-nullsafety.1
• cupertino_icons 1.0.2
• device_info 2.0.0 [flutter device_info_platform_interface]
• easy_localization 3.0.0 [flutter shared_preferences intl args path easy_logger flutter_localizations]
• firebase_analytics 8.0.2 [firebase_analytics_platform_interface firebase_analytics_web firebase_core flutter meta]
• firebase_auth 1.1.3 [firebase_auth_platform_interface firebase_auth_web firebase_core firebase_core_platform_interface flutter meta]
• firebase_core 1.1.0 [firebase_core_platform_interface firebase_core_web flutter meta]
• firebase_crashlytics 2.0.2 [firebase_core firebase_core_platform_interface firebase_crashlytics_platform_interface flutter stack_trace]
• firebase_messaging 9.1.3 [firebase_core firebase_core_platform_interface firebase_messaging_platform_interface firebase_messaging_web flutter meta]
• firebase_remote_config 0.10.0-dev.2 [firebase_core firebase_core_platform_interface firebase_remote_config_platform_interface flutter]
• firebase_storage 8.0.5 [firebase_core firebase_core_platform_interface firebase_storage_platform_interface firebase_storage_web flutter]
• flutter 0.0.0 [characters collection meta typed_data vector_math sky_engine]
• flutter_bloc 7.0.0 [flutter bloc provider]
• flutter_dialogs 1.1.0 [flutter]
• flutter_native_config 0.0.2 [flutter]
• geoflutterfire 3.0.0-nullsafety.2 [flutter cloud_firestore rxdart]
• geolocator 7.0.3 [flutter geolocator_platform_interface geolocator_web]
• google_maps_place_picker 2.0.0-nullsafety.3 [flutter google_maps_flutter geolocator permission_handler provider google_maps_webservice google_api_headers tuple http]
• image_cropper 1.4.0 [flutter]
• image_picker 0.7.4 [flutter flutter_plugin_android_lifecycle image_picker_platform_interface image_picker_for_web]
• in_app_purchase 0.5.2 [flutter json_annotation meta collection]
• json_serializable 4.1.1 [analyzer build build_config collection json_annotation meta path source_gen]
• keyboard_actions 3.4.0 [flutter]
• launch_review 3.0.1 [flutter]
• logger 1.0.0
• package_info 2.0.0 [flutter]
• retrofit 2.0.0-beta1 [dio meta]
• shared_preferences 2.0.5 [meta flutter shared_preferences_platform_interface shared_preferences_linux shared_preferences_macos shared_preferences_web shared_preferences_windows]
• url_launcher 6.0.3 [flutter url_launcher_platform_interface url_launcher_linux url_launcher_macos url_launcher_windows url_launcher_web]
• webview_flutter 2.0.4 [flutter]

dev dependencies:

• build_runner 1.12.2 [args async build build_config build_daemon build_resolvers build_runner_core code_builder collection crypto dart_style glob graphs http_multi_server io js logging meta mime path pedantic pool pub_semver pubspec_parse shelf shelf_web_socket stack_trace stream_transform timing watcher web_socket_channel yaml]
• flutter_test 0.0.0 [flutter test_api path fake_async clock stack_trace vector_math async boolean_selector characters charcode collection matcher meta source_span stream_channel string_scanner term_glyph typed_data]
• retrofit_generator 2.0.0-beta3 [dio source_gen built_collection code_builder tuple retrofit analyzer dart_style build]

transitive dependencies:

• _fe_analyzer_shared 21.0.0 [meta]
• analyzer 1.5.0 [_fe_analyzer_shared cli_util collection convert crypto glob meta package_config path pub_semver source_span watcher yaml pedantic]
• archive 3.1.2 [crypto path]
• args 2.1.0
• async 2.5.0 [collection]
• bloc 7.0.0 [meta]
• boolean_selector 2.1.0 [source_span string_scanner]
• build 2.0.1 [analyzer async convert crypto glob logging meta path]
• build_config 0.4.7 [checked_yaml json_annotation meta path pubspec_parse yaml]
• build_daemon 2.1.10 [built_collection built_value http_multi_server logging pedantic path pool shelf shelf_web_socket stream_transform watcher web_socket_channel]
• build_resolvers 2.0.0 [analyzer build crypto graphs logging path package_config pool pub_semver stream_transform]
• build_runner_core 6.1.12 [async build build_config build_resolvers collection convert crypto glob graphs logging meta path package_config pedantic pool timing watcher yaml]
• built_collection 5.0.0
• built_value 8.0.5 [built_collection collection fixnum]
• characters 1.1.0
• charcode 1.2.0
• checked_yaml 2.0.1 [json_annotation source_span yaml]
• cli_util 0.3.0 [meta path]
• clock 1.1.0
• cloud_firestore_platform_interface 4.0.3 [collection firebase_core flutter meta plugin_platform_interface]
• cloud_firestore_web 1.0.7 [cloud_firestore_platform_interface firebase_core firebase_core_web flutter flutter_web_plugins js]
• code_builder 3.7.0 [built_collection built_value collection matcher meta]
• collection 1.15.0
• convert 3.0.0 [typed_data]
• crypto 3.0.1 [collection typed_data]
• dart_style 2.0.1 [analyzer args path pub_semver source_span]
• device_info_platform_interface 2.0.1 [flutter meta plugin_platform_interface]
• dio 4.0.0 [http_parser path]
• easy_logger 0.0.2 [flutter]
• fake_async 1.2.0 [clock collection]
• ffi 1.0.0
• file 6.1.0 [meta path]
• firebase 9.0.1 [http http_parser js]
• firebase_analytics_platform_interface 2.0.0 [flutter meta]
• firebase_analytics_web 0.3.0 [firebase firebase_analytics_platform_interface flutter flutter_web_plugins meta]
• firebase_auth_platform_interface 4.2.1 [firebase_core flutter meta plugin_platform_interface]
• firebase_auth_web 1.1.1 [firebase_auth_platform_interface firebase_core firebase_core_web flutter flutter_web_plugins http_parser intl js meta]
• firebase_core_platform_interface 4.0.0 [flutter meta plugin_platform_interface]
• firebase_core_web 1.0.2 [firebase_core_platform_interface flutter flutter_web_plugins js meta]
• firebase_crashlytics_platform_interface 3.0.2 [collection firebase_core flutter meta plugin_platform_interface]
• firebase_messaging_platform_interface 2.1.3 [firebase_core flutter meta plugin_platform_interface]
• firebase_messaging_web 1.0.6 [firebase_core firebase_core_web firebase_messaging_platform_interface flutter flutter_web_plugins js meta]
• firebase_remote_config_platform_interface 0.3.0-dev.2 [firebase_core flutter meta plugin_platform_interface]
• firebase_storage_platform_interface 2.0.3 [collection firebase_core flutter meta plugin_platform_interface]
• firebase_storage_web 1.0.5 [async firebase_core firebase_core_web firebase_storage_platform_interface flutter flutter_web_plugins http js meta]
• fixnum 1.0.0
• flutter_blurhash 0.6.0 [flutter meta pedantic]
• flutter_cache_manager 3.0.1 [clock collection file flutter http image path path_provider pedantic rxdart sqflite uuid]
• flutter_localizations 0.0.0 [flutter intl characters clock collection meta path typed_data vector_math]
• flutter_plugin_android_lifecycle 2.0.1 [flutter]
• flutter_web_plugins 0.0.0 [flutter js characters collection meta typed_data vector_math]
• geolocator_platform_interface 2.0.2 [flutter plugin_platform_interface vector_math meta]
• geolocator_web 2.0.3 [flutter flutter_web_plugins geolocator_platform_interface]
• glob 2.0.1 [async collection file path pedantic string_scanner]
• google_api_headers 1.0.0 [flutter package_info]
• google_maps_flutter 2.0.3 [flutter flutter_plugin_android_lifecycle google_maps_flutter_platform_interface]
• google_maps_flutter_platform_interface 2.0.4 [flutter meta plugin_platform_interface stream_transform collection]
• google_maps_webservice 0.0.20-nullsafety.4 [http meta json_annotation]
• graphs 1.0.0
• http 0.13.2 [async http_parser meta path pedantic]
• http_multi_server 3.0.1 [async]
• http_parser 4.0.0 [charcode collection source_span string_scanner typed_data]
• image 3.0.2 [archive meta xml]
• image_picker_for_web 2.0.0 [image_picker_platform_interface meta flutter flutter_web_plugins]
• image_picker_platform_interface 2.1.0 [flutter meta http plugin_platform_interface]
• intl 0.17.0 [clock path]
• io 1.0.0 [meta path string_scanner]
• js 0.6.3
• json_annotation 4.0.1
• logging 1.0.1
• matcher 0.12.10 [stack_trace]
• meta 1.3.0
• mime 1.0.0
• modal_bottom_sheet 2.0.0 [flutter]
• nested 1.0.0 [flutter]
• octo_image 1.0.0+1 [flutter flutter_blurhash]
• package_config 2.0.0 [path]
• path 1.8.0
• path_provider 2.0.1 [flutter path_provider_platform_interface path_provider_macos path_provider_linux path_provider_windows]
• path_provider_linux 2.0.0 [path xdg_directories path_provider_platform_interface flutter]
• path_provider_macos 2.0.0 [flutter]
• path_provider_platform_interface 2.0.1 [flutter meta platform plugin_platform_interface]
• path_provider_windows 2.0.1 [path_provider_platform_interface meta path flutter ffi win32]
• pedantic 1.11.0
• permission_handler 6.1.3 [flutter meta permission_handler_platform_interface]
• permission_handler_platform_interface 3.3.0 [flutter meta plugin_platform_interface]
• petitparser 4.1.0 [meta]
• platform 3.0.0
• plugin_platform_interface 2.0.0 [meta]
• pool 1.5.0 [async stack_trace]
• process 4.2.1 [file path platform]
• provider 5.0.0 [collection flutter nested]
• pub_semver 2.0.0 [collection]
• pubspec_parse 1.0.0 [checked_yaml collection json_annotation pub_semver yaml]
• quiver 3.0.1 [matcher]
• rxdart 0.26.0
• shared_preferences_linux 2.0.0 [flutter file meta path path_provider_linux shared_preferences_platform_interface]
• shared_preferences_macos 2.0.0 [shared_preferences_platform_interface flutter]
• shared_preferences_platform_interface 2.0.0 [flutter]
• shared_preferences_web 2.0.0 [shared_preferences_platform_interface flutter flutter_web_plugins meta]
• shared_preferences_windows 2.0.0 [shared_preferences_platform_interface flutter file meta path path_provider_platform_interface path_provider_windows]
• shelf 1.1.1 [async collection http_parser path stack_trace stream_channel]
• shelf_web_socket 1.0.1 [shelf stream_channel web_socket_channel]
• sky_engine 0.0.99
• source_gen 1.0.0 [analyzer async build dart_style glob meta path pedantic source_span]
• source_span 1.8.0 [charcode collection path term_glyph]
• sqflite 2.0.0+3 [flutter sqflite_common path]
• sqflite_common 2.0.0+2 [synchronized path meta]
• stack_trace 1.10.0 [path]
• stream_channel 2.1.0 [async]
• stream_transform 2.0.0
• string_scanner 1.1.0 [charcode source_span]
• synchronized 3.0.0
• term_glyph 1.2.0
• test_api 0.2.19 [async boolean_selector collection meta path source_span stack_trace stream_channel string_scanner term_glyph matcher]
• timing 1.0.0 [json_annotation]
• tuple 2.0.0 [quiver]
• typed_data 1.3.0 [collection]
• universal_platform 1.0.0-nullsafety
• url_launcher_linux 2.0.0 [flutter]
• url_launcher_macos 2.0.0 [flutter]
• url_launcher_platform_interface 2.0.2 [flutter plugin_platform_interface]
• url_launcher_web 2.0.0 [url_launcher_platform_interface meta flutter flutter_web_plugins]
• url_launcher_windows 2.0.0 [flutter]
• uuid 3.0.4 [crypto]
• vector_math 2.1.0
• watcher 1.0.0 [async path pedantic]
• web_socket_channel 2.0.0 [async crypto stream_channel]
• win32 2.0.5 [ffi]
• xdg_directories 0.2.0 [meta path process]
• xml 5.1.0 [collection meta petitparser]
• yaml 3.1.0 [collection source_span string_scanner]

[DrNorton]

I have same problem. @JsonKey( fromJson: getShapeDtoFromJson, toJson: getJsonFromShapeDto) final NgApiShapeDto? geometry;

It generate geometry: getShapeDtoFromJson(json['geometry'] as Map<String, dynamic>)

[nzackoya]

I have same problem. @JsonKey( fromJson: getShapeDtoFromJson, toJson: getJsonFromShapeDto) final NgApiShapeDto? geometry;

It generate geometry: getShapeDtoFromJson(json['geometry'] as Map<String, dynamic>)

Hey, as a workaround just change Map<String, dynamic> to simply Map in your getShapeDtoFromJson. It will generate as Map?

[DrNorton]

I changed to NgApiShapeDto? getShapeDtoFromJson(Map? json)

It generated - getShapeDtoFromJson(json['geometry'] as Map?),

Thank you. Its great

[kevmoo]

This has been fixed in 4.1.3