Hello, I'm having a problem with deserializing object using delegate interface, any ideas?

# jackson-kotlin

[Jukka Siivonen]

Hello, I'm having a problem with deserializing object using delegate interface, any ideas?

[Jukka Siivonen]

class FooRequest(
    private val payload: PayloadImpl,
    override val someInterfaceField: Boolean
) : Payload by payload, SomeInterface

[Jukka Siivonen]

that one does not work but this will work without having additional "payload" object in JSON, I wonder why that is

[Jukka Siivonen]

class FooRequest(
    private val payload: PayloadImpl
) : Payload by payload

[Jukka Siivonen]

alson @JsonUnwrapped does not work for deserialization because then I get problem described in

[Jukka Siivonen]

https://github.com/FasterXML/jackson-module-kotlin/issues/56

[Jukka Siivonen]

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot define Creator property "payload" as `@JsonUnwrapped`: combination not yet supported

[Jukka Siivonen]

What I would like to know is why the latter example behaves like its magically using @JsonUnrapped somehow

[araqnid]

Istr that when the target class for deserialization has a single-parameter constructor, Jackson automagically supports deserializing to that constructor parameter and then calling the constructor - sort of an implicit builder pattern. I’ve certainly used this for constructing objects from strings during deserialization in the past