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kotlinlang

Q: I have a serializable data class Foo which has two properties a, b
```
@Serializable
data class Foo(
    val a: String,
    val b: List&lt;String&gt;
)
```
I'd like to handle read/write asymmetrically in this case (using JSON):
- For *read* I'd like to read both *a and b* properties from json string
- For *write* however I'd like to serialize *only b* to json string

I've tried the Mapper to convert this to a map remove the unwanted key, but then I could not find a way to serialize the Map&lt;String, Any&gt;

What do you think would be the best solution for this case?

Something like @Transient(In|Out|InOut) would be great :slightly_smiling_face:

Just curious, why wont @Optional with `val a:String? = null` be enough?

because it should not be null I just don't want to write it

Foo itself need all of the properties set :disappointed:

Seems awfully weird. The basis for serialization is that the serialized format is going to match whatever your model holds. It still has to zero pad the bytes ending up in the output even though its going to be empty