Custom de-/serialization of models: Are serialize and deserialize functions in FirestoreAttribute annotation possible?

[lukas-h]

class FakeEnum{
    String _val;
    FakeEnum._(this._val);
    factory FakeEnum.fromString(String val){
        switch(val) {
            case 'option1':
                return FakeEnum._(val);
                break;
            default:
                throw UnsupportedError('illegal value');
        }
    }
    factory FakeEnum.option1() => FakeEnum._('option1');
    
    @override
    toString() => _val;
}

@FirestoreDocument
class Model {
    @FirestoreAttribute(serialize: (FakeEnum val) => val.toString(), deserialize: (String value) => FakeEnum(String val))
    FakeEnum fakeEnum;

[lukas-h]

Another possibe way to write this:

class FakeEnum implements FirestoreSerializableHelper {
    final String _val;
    FakeEnum._(this._val);

    // demanded constructor by code generated for Model
    factory FakeEnum.deserialize(String val) => FakeEnum._(val);
    
    // demanded function by code generated for Model
   @override 
    String serialize() => _val;
}

@FirestoreDocument
class Model {
    @FirestoreAttribute(customSerialization: true)
    FakeEnum fakeEnum;

-> code generator uses by deserialize constructor and serialize function by default, if type has is not ignored, of supported type or not annotated with @FirestoreDocument.

[lukas-h]

idea: introduce new annotation to mark a model with custom serialization