Added createJsonKeys

json_annotation/CHANGELOG.md

@@ -1,6 +1,8 @@
 ## 4.8.2-wip
 
 - Require Dart 3.0
+- Added `JsonSerializable(createJsonKeys: true)`.
+ ([#1401](https://github.com/google/json_serializable.dart/pull/1401))
 
 ## 4.8.1
 

json_annotation/lib/src/json_serializable.dart

@@ -87,6 +87,21 @@ class JsonSerializable {
  /// such as [fieldRename].
  final bool? createFieldMap;
 
+ /// If `true` (defaults to false), a private class `_$ExampleJsonKeys`
+ /// constant is created in the generated part file.
+ ///
+ /// This class will contain every property, with the json key as value,
+ /// exposing a secured way to access the json key from the property.
+ ///
+ /// ```dart
+ /// @JsonSerializable(createJsonKeys: true)
+ /// class Example {
+ /// // ...
+ /// static const jsonKeys = _$PublicationImplJsonKeys();
+ /// }
+ /// ```
+ final bool? createJsonKeys;
+
  /// If `true` (defaults to false), a private, static `_$ExamplePerFieldToJson`
  /// abstract class will be generated in the part file.
  ///
@@ -247,6 +262,7 @@ class JsonSerializable {
  this.checked,
  this.constructor,
  this.createFieldMap,
+ this.createJsonKeys,
  this.createFactory,
  this.createToJson,
  this.disallowUnrecognizedKeys,

json_serializable/CHANGELOG.md

@@ -1,6 +1,8 @@
 ## 6.7.2-wip
 
 - Add type arguments to `Map` literals used for `Record` serialization.
+- Added support for generating `ExampleJsonKeys`, exposing a secured way to access the json keys from the properties.
+ ([#1164](https://github.com/google/json_serializable.dart/pull/1164))
 
 ## 6.7.1
 

json_serializable/README.md

@@ -276,6 +276,7 @@ targets:
  constructor: ""
  create_factory: true
  create_field_map: false
+ create_json_keys: false
  create_per_field_to_json: false
  create_to_json: true
  disallow_unrecognized_keys: false
@@ -297,15 +298,15 @@ targets:
 [`Enum`]: https://api.dart.dev/stable/dart-core/Enum-class.html
 [`int`]: https://api.dart.dev/stable/dart-core/int-class.html
 [`Iterable`]: https://api.dart.dev/stable/dart-core/Iterable-class.html
-[`JsonConverter`]: https://pub.dev/documentation/json_annotation/4.8.1/json_annotation/JsonConverter-class.html
-[`JsonEnum.valueField`]: https://pub.dev/documentation/json_annotation/4.8.1/json_annotation/JsonEnum/valueField.html
-[`JsonEnum`]: https://pub.dev/documentation/json_annotation/4.8.1/json_annotation/JsonEnum-class.html
-[`JsonKey.fromJson`]: https://pub.dev/documentation/json_annotation/4.8.1/json_annotation/JsonKey/fromJson.html
-[`JsonKey.toJson`]: https://pub.dev/documentation/json_annotation/4.8.1/json_annotation/JsonKey/toJson.html
-[`JsonKey`]: https://pub.dev/documentation/json_annotation/4.8.1/json_annotation/JsonKey-class.html
-[`JsonLiteral`]: https://pub.dev/documentation/json_annotation/4.8.1/json_annotation/JsonLiteral-class.html
-[`JsonSerializable`]: https://pub.dev/documentation/json_annotation/4.8.1/json_annotation/JsonSerializable-class.html
-[`JsonValue`]: https://pub.dev/documentation/json_annotation/4.8.1/json_annotation/JsonValue-class.html
+[`JsonConverter`]: https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonConverter-class.html
+[`JsonEnum.valueField`]: https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonEnum/valueField.html
+[`JsonEnum`]: https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonEnum-class.html
+[`JsonKey.fromJson`]: https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonKey/fromJson.html
+[`JsonKey.toJson`]: https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonKey/toJson.html
+[`JsonKey`]: https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonKey-class.html
+[`JsonLiteral`]: https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonLiteral-class.html
+[`JsonSerializable`]: https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonSerializable-class.html
+[`JsonValue`]: https://pub.dev/documentation/json_annotation/latest/json_annotation/JsonValue-class.html
 [`List`]: https://api.dart.dev/stable/dart-core/List-class.html
 [`Map`]: https://api.dart.dev/stable/dart-core/Map-class.html
 [`num`]: https://api.dart.dev/stable/dart-core/num-class.html

json_serializable/lib/src/encoder_helper.dart

@@ -63,6 +63,28 @@ mixin EncodeHelper implements HelperCore {
  return buffer.toString();
  }
 
+ /// Generates an object containing metadatas related to the encoding,
+ /// destined to be used by other code-generators.
+ String createJsonKeys(Set<FieldElement> accessibleFieldSet) {
+ assert(config.createJsonKeys);
+
+ final buffer = StringBuffer(
+ 'abstract final class _\$${element.name.nonPrivate}JsonKeys {',
+ );
+ // ..write('static const _\$${element.name.nonPrivate}JsonKeys();');
+
+ for (final field in accessibleFieldSet) {
+ buffer.writeln(
+ 'static const String ${field.name} = '
+ '${escapeDartString(nameAccess(field))};',
+ );
+ }
+
+ buffer.write('}');
+
+ return buffer.toString();
+ }
+
  Iterable<String> createToJson(Set<FieldElement> accessibleFields) sync* {
  assert(config.createToJson);
 

json_serializable/lib/src/generator_helper.dart

@@ -132,6 +132,10 @@ class GeneratorHelper extends HelperCore with EncodeHelper, DecodeHelper {
  yield createFieldMap(accessibleFieldSet);
  }
 
+ if (config.createJsonKeys) {
+ yield createJsonKeys(accessibleFieldSet);
+ }
+
  if (config.createPerFieldToJson) {
  yield createPerFieldToJson(accessibleFieldSet);
  }

json_serializable/lib/src/type_helpers/config_types.dart

@@ -49,6 +49,7 @@ class ClassConfig {
  final bool createFactory;
  final bool createToJson;
  final bool createFieldMap;
+ final bool createJsonKeys;
  final bool createPerFieldToJson;
  final bool disallowUnrecognizedKeys;
  final bool explicitToJson;
@@ -66,6 +67,7 @@ class ClassConfig {
  required this.createFactory,
  required this.createToJson,
  required this.createFieldMap,
+ required this.createJsonKeys,
  required this.createPerFieldToJson,
  required this.disallowUnrecognizedKeys,
  required this.explicitToJson,
@@ -85,6 +87,8 @@ class ClassConfig {
  constructor: config.constructor ?? ClassConfig.defaults.constructor,
  createFieldMap:
  config.createFieldMap ?? ClassConfig.defaults.createFieldMap,
+ createJsonKeys:
+ config.createJsonKeys ?? ClassConfig.defaults.createJsonKeys,
  createPerFieldToJson: config.createPerFieldToJson ??
  ClassConfig.defaults.createPerFieldToJson,
  createFactory:
@@ -113,6 +117,7 @@ class ClassConfig {
  createFactory: true,
  createToJson: true,
  createFieldMap: false,
+ createJsonKeys: false,
  createPerFieldToJson: false,
  disallowUnrecognizedKeys: false,
  explicitToJson: false,
@@ -129,6 +134,7 @@ class ClassConfig {
  createFactory: createFactory,
  createToJson: createToJson,
  createFieldMap: createFieldMap,
+ createJsonKeys: createJsonKeys,
  createPerFieldToJson: createPerFieldToJson,
  ignoreUnannotated: ignoreUnannotated,
  explicitToJson: explicitToJson,

json_serializable/lib/src/utils.dart

@@ -58,6 +58,7 @@ JsonSerializable _valueForAnnotation(ConstantReader reader) => JsonSerializable(
  createFactory: reader.read('createFactory').literalValue as bool?,
  createToJson: reader.read('createToJson').literalValue as bool?,
  createFieldMap: reader.read('createFieldMap').literalValue as bool?,
+ createJsonKeys: reader.read('createJsonKeys').literalValue as bool?,
  createPerFieldToJson:
  reader.read('createPerFieldToJson').literalValue as bool?,
  disallowUnrecognizedKeys:
@@ -106,6 +107,7 @@ ClassConfig mergeConfig(
  createFactory: annotation.createFactory ?? config.createFactory,
  createToJson: annotation.createToJson ?? config.createToJson,
  createFieldMap: annotation.createFieldMap ?? config.createFieldMap,
+ createJsonKeys: annotation.createJsonKeys ?? config.createJsonKeys,
  createPerFieldToJson:
  annotation.createPerFieldToJson ?? config.createPerFieldToJson,
  disallowUnrecognizedKeys:

json_serializable/pubspec.yaml

@@ -29,6 +29,10 @@ dependencies:
  source_gen: ^1.3.2
  source_helper: ^1.3.0
 
+dependency_overrides:
+ json_annotation:
+ path: ../json_annotation
+
 dev_dependencies:
  _json_serial_shared_test:
  path: ../shared_test

json_serializable/test/config_test.dart

@@ -153,6 +153,7 @@ const _invalidConfig = {
  'constructor': 42,
  'create_factory': 42,
  'create_field_map': 42,
+ 'create_json_keys': 42,
  'create_per_field_to_json': 42,
  'create_to_json': 42,
  'disallow_unrecognized_keys': 42,

json_serializable/test/integration/integration_test.dart

@@ -10,6 +10,7 @@ import 'converter_examples.dart';
 import 'create_per_field_to_json_example.dart';
 import 'field_map_example.dart';
 import 'json_enum_example.dart';
+import 'json_keys_example.dart' as js_keys;
 import 'json_test_common.dart' show Category, Platform, StatusCode;
 import 'json_test_example.dart';
 
@@ -471,4 +472,8 @@ void main() {
  test('value field index fun', () {
  expect(enumValueFieldIndexValues, [0, 701, 2]);
  });
+
+ test('ModelJsonKeys', () {
+ expect(js_keys.keys, {'first-name', 'LAST_NAME'});
+ });
 }

json_serializable/test/integration/json_keys_example.dart

@@ -0,0 +1,32 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'json_keys_example.g.dart';
+
+@JsonSerializable(createJsonKeys: true, fieldRename: FieldRename.kebab)
+class Model {
+ Model({
+ required this.firstName,
+ required this.lastName,
+ this.ignoredName,
+ });
+
+ factory Model.fromJson(Map<String, Object?> json) => _$ModelFromJson(json);
+
+ final String firstName;
+
+ @JsonKey(name: 'LAST_NAME')
+ final String lastName;
+
+ @JsonKey(includeFromJson: false, includeToJson: false)
+ final String? ignoredName;
+
+ String get fullName => '$firstName $lastName';
+
+ Map<String, Object?> toJson() => _$ModelToJson(this);
+}
+
+// TODO: use this once https://github.com/dart-lang/sdk/issues/54543 is fixed
+typedef ModelJsonKeys = _$ModelJsonKeys;
+
+// Work-around until https://github.com/dart-lang/sdk/issues/54543 is fixed
+Set<String> get keys => {_$ModelJsonKeys.firstName, _$ModelJsonKeys.lastName};

json_serializable/test/shared_config.dart

@@ -20,6 +20,7 @@ final generatorConfigNonDefaultJson =
  createFactory: false,
  createToJson: false,
  createFieldMap: true,
+ createJsonKeys: true,
  createPerFieldToJson: true,
  disallowUnrecognizedKeys: true,
  explicitToJson: true,

json_serializable/test/test_sources/test_sources.dart

@@ -16,6 +16,7 @@ class ConfigurationImplicitDefaults {
  createFactory: true,
  createToJson: true,
  createFieldMap: false,
+ createJsonKeys: false,
  createPerFieldToJson: false,
  disallowUnrecognizedKeys: false,
  explicitToJson: false,

json_serializable/tool/readme/readme_template.md

@@ -141,6 +141,7 @@ targets:
  constructor: ""
  create_factory: true
  create_field_map: false
+ create_json_keys: false
  create_per_field_to_json: false
  create_to_json: true
  disallow_unrecognized_keys: false