How can I exclude value from `@Parcelize`? I have a class where `Bar` is 3rd party library class. ``...

# android

[martynas]

How can I exclude value from @Parcelize? I have a class where Bar is 3rd party library class.

data class Foo(
  val id : Int = 0,
  val bar : Bar? = null
)

At compile time I get Type is not directly supported by 'Parcelize'. Annotate the parameter type with '@RawValue' if you want it to be serialized using 'writeValue()' on Bar.
That is fine by me. I’m happy to lose that value. But no combination of @IgnoredOnParcel and @RawValue did not worked for me yet - runtime error when serializing value.

[Lucas Ł]

It's probably not exactly what you need, but you could do something like this:

@Parcelize
data class Foo(val id: Int = 0) : Parcelable {
    @IgnoredOnParcel
    var bar: Bar? = null
}

The error doesn't appear, even without the @IgnoredOnParcel annotation

or just do it the old fashioned way, and implement the Parcelable interface yourself 🙂

[martynas]

Yeah that would, but then I have to make bar mutable

[martynas]

Which is not desirable

[martynas]

Worked around it by implementing Parceler.

NoOpParceler : Parceler<Any?> {
    override fun create(parcel: Parcel): Any? = null
    override fun Any?.write(parcel: Parcel, flags: Int) = Unit
}

[martynas]

now it works with any “undesirable” 🙂

[kenkyee]

I filed a ticket for @IgnoredOnParcel... Doesn't work

[martynas]

@kenkyee could you share a link to the ticket?

[kenkyee]

https://youtrack.jetbrains.com/issue/KT-24459

[kenkyee]

comment on it w/ your use case to make sure it's accounted for

[martynas]

I see, that Yan commented about my case

[martynas]

It’s not supposed to work on constructor parameters

[Lucas Ł]

I guess I was pretty close with my snippet to the intended use 😂

[kenkyee]

I still don't understand why it can't work on constructor parameters, especially with data classes...