feat: allow exclude fields from toJson and toMap

packages/dart_mappable/lib/src/annotations.dart

@@ -13,6 +13,7 @@ class MappableClass extends MappableInterface {
   const MappableClass({
     super.caseStyle,
     super.ignoreNull,
+    super.ignore,
     super.uniqueId,
     this.discriminatorKey,
     this.discriminatorValue,
@@ -145,6 +146,7 @@ class MappableRecord extends MappableInterface {
   const MappableRecord({
     super.caseStyle,
     super.ignoreNull,
+    super.ignore,
     super.uniqueId,
     super.hook,
     super.includeCustomMappers,
@@ -158,6 +160,7 @@ abstract class MappableInterface {
   const MappableInterface._({
     this.caseStyle,
     this.ignoreNull,
+    this.ignore,
     this.uniqueId,
     this.hook,
     this.generateMethods,
@@ -170,6 +173,9 @@ abstract class MappableInterface {
   /// If true removes all map keys with null values.
   final bool? ignoreNull;
 
+  /// Property keys to exclude from `toMap` and `toJson`.
+  final Iterable<String>? ignore;
+
   /// A unique id representing this class.
   ///
   /// This only needs to be set when you have two classes with the same name
@@ -205,6 +211,7 @@ class MappableLib {
     this.caseStyle,
     this.enumCaseStyle,
     this.ignoreNull,
+    this.ignore,
     this.discriminatorKey,
     this.generateMethods,
     this.generateInitializerForScope,
@@ -219,6 +226,9 @@ class MappableLib {
   /// If true removes all map keys with null values.
   final bool? ignoreNull;
 
+  /// Property keys to exclude from `toMap` and `toJson`.
+  final Iterable<String>? ignore;
+
   /// Property key used for type discriminators.
   final String? discriminatorKey;
 

packages/dart_mappable/lib/src/mappers/class_mapper.dart

@@ -200,8 +200,13 @@ abstract class ClassMapperBase<T extends Object>
 
   @override
   Object? encode(T value, EncodingContext context) {
-    var result =
-        InterfaceMapperBase.encodeFields(value, _params, ignoreNull, context);
+    var result = InterfaceMapperBase.encodeFields(
+      value,
+      _params,
+      ignoreNull,
+      ignore,
+      context,
+    );
     if (_encodedStaticParams != null) {
       return {...result, ...?_encodedStaticParams};
     }

packages/dart_mappable/lib/src/mappers/interface_mapper.dart

@@ -114,6 +114,9 @@ abstract class InterfaceMapperBase<T extends Object> extends MapperBase<T> {
   /// Whether to ignore null values when encoding the fields of this interface.
   bool get ignoreNull => false;
 
+  /// Whether to ignore values when encoding the fields of this interface.
+  Iterable<String> get ignore => [];
+
   /// The optional mapping hook defined for this interface.
   MappingHook? get hook => null;
 
@@ -185,21 +188,35 @@ abstract class InterfaceMapperBase<T extends Object> extends MapperBase<T> {
       T value,
       Iterable<Field<T, dynamic>> fields,
       bool ignoreNull,
+      Iterable<String> ignore,
       EncodingContext context) {
     bool shallow = context.options?.shallow ?? false;
+
+    // Helper to determine if a field should be ignored
+    bool shouldIncludeField(Field<T, dynamic> f) {
+      return !ignore.contains(f.key);
+    }
+
     if (shallow) {
       return {
         for (var f in fields)
-          if (!ignoreNull || f.get(value) != null) f.key: f.get(value),
+          if (shouldIncludeField(f) && (!ignoreNull || f.get(value) != null))
+            f.key: f.get(value),
       };
     }
+
     if (ignoreNull) {
       return {
         for (var f in fields)
-          if (f.get(value) != null) f.key: f.encode(value, context),
+          if (shouldIncludeField(f) && f.get(value) != null)
+            f.key: f.encode(value, context),
       };
     }
-    return {for (var f in fields) f.key: f.encode(value, context)};
+
+    return {
+      for (var f in fields)
+        if (shouldIncludeField(f)) f.key: f.encode(value, context),
+    };
   }
 
   V decodeMap<V>(Map<String, dynamic> map) => decodeValue<V>(map);

packages/dart_mappable/lib/src/mappers/record_mapper.dart

@@ -26,8 +26,13 @@ abstract class RecordMapperBase<T extends Record> extends InterfaceMapperBase<T>
 
   @override
   Object? encode(T value, EncodingContext context) {
-    return InterfaceMapperBase.encodeFields(value, fields.values, ignoreNull,
-        context.change(args: () => apply(context)));
+    return InterfaceMapperBase.encodeFields(
+      value,
+      fields.values,
+      ignoreNull,
+      ignore,
+      context.change(args: () => apply(context)),
+    );
   }
 
   @override

packages/dart_mappable_builder/lib/src/builder_options.dart

@@ -12,6 +12,7 @@ class MappableOptions {
   final CaseStyle? caseStyle;
   final CaseStyle? enumCaseStyle;
   final bool? ignoreNull;
+  final Iterable<String>? ignore;
   final String? discriminatorKey;
   final int? generateMethods;
   final InitializerScope? initializerScope;
@@ -23,6 +24,7 @@ class MappableOptions {
     this.caseStyle,
     this.enumCaseStyle,
     this.ignoreNull,
+    this.ignore,
     this.discriminatorKey,
     this.generateMethods,
     this.initializerScope,
@@ -36,6 +38,7 @@ class MappableOptions {
         enumCaseStyle =
             CaseStyle.fromString(options['enumCaseStyle'] as String?),
         ignoreNull = options['ignoreNull'] as bool?,
+        ignore = options['ignore'] as Iterable<String>?,
         discriminatorKey = options['discriminatorKey'] as String?,
         generateMethods =
             parseGenerateMethods(toList(options['generateMethods'])),
@@ -53,6 +56,7 @@ class MappableOptions {
       caseStyle: options.caseStyle ?? caseStyle,
       enumCaseStyle: options.enumCaseStyle ?? enumCaseStyle,
       ignoreNull: options.ignoreNull ?? ignoreNull,
+      ignore: options.ignore ?? ignore,
       discriminatorKey: options.discriminatorKey ?? discriminatorKey,
       generateMethods: options.generateMethods ?? generateMethods,
       initializerScope: options.initializerScope ?? initializerScope,
@@ -66,6 +70,7 @@ class MappableOptions {
       caseStyle: caseStyleFromAnnotation(object.read('caseStyle')),
       enumCaseStyle: caseStyleFromAnnotation(object.read('enumCaseStyle')),
       ignoreNull: object.read('ignoreNull')?.toBoolValue(),
+      ignore: object.read('ignore')?.toStringList(),
       discriminatorKey: object.read('discriminatorKey')?.toStringValue(),
       generateMethods: object.read('generateMethods')?.toIntValue(),
       initializerScope: initScope?.isNull ?? true

packages/dart_mappable_builder/lib/src/elements/class/class_mapper_element.dart

@@ -64,6 +64,9 @@ abstract class ClassMapperElement extends InterfaceMapperElement<ClassElement>
           superElement?.ignoreNull ??
           false;
 
+  late final Iterable<String> ignore =
+      annotation.value?.read('ignore')?.toStringList() ?? [];
+
   late final int generateMethods =
       annotation.value?.read('generateMethods')?.toIntValue() ??
           options.generateMethods ??

packages/dart_mappable_builder/lib/src/generators/class_mapper_generator.dart

@@ -50,6 +50,11 @@ class ClassMapperGenerator extends MapperGenerator<TargetClassMapperElement>
       output.write('  @override\n  final bool ignoreNull = true;\n');
     }
 
+    if (element.ignore.isNotEmpty) {
+      output.write(
+          '  @override\n  final Iterable<String> ignore = const [${element.ignore.map((e) => "'$e'").join(', ')}];\n');
+    }
+
     if (element.isDiscriminatingSubclass) {
       await generateDiscriminatorFields(output);
       generateInheritOverride(output);

packages/dart_mappable_builder/lib/src/utils.dart

@@ -167,6 +167,9 @@ extension NullableType on DartType {
 extension TypeList on DartObject {
   List<DartType>? toTypeList() =>
       toListValue()?.map((o) => o.toTypeValue()).whereType<DartType>().toList();
+
+  List<String>? toStringList() =>
+      toListValue()?.map((o) => o.toStringValue()).whereType<String>().toList();
 }
 
 extension ObjectReader on DartObject {