Hi, would it be possible to implement a general `@...

# serialization

[Ivan Đorđević]

Hi, would it be possible to implement a general @Flatten annotation (or a custom serializer that works for any @Serializable class), that would flatten nested classes into a flat JSON structure?

Example from stack overflow (https://stackoverflow.com/questions/64556699/serialize-kotlin-nested-classes-to-flat-json)

An Example:

@Serializable
data class Address(val street: String, val postalCode: String)

@Serializable
data class Customer(val id: String, val name: String, val address: Address)

The default behaviour upon serialization is:

{
    "id": "123ABC",
    "name": "Joe"
    "address": {
        "street": "my street",
        "postalCode": "123456"
    }
}

What i want is:

{
    "id": "123ABC",
    "name": "Joe"
    "street": "my street",
    "postalCode": "123456"
}

The accepted answer does work, but it requires basically a per-type custom implementation which is a lot of boilerplate. Is there a way to do this in a general manner, so that it works for any nested serializable class?