Hello! I’m getting this stacktrace when trying to deserialize my model. It is in proto3 format, but has no

packed

fields and all fields in data class are nullable or provided with defaults. Any tips?

Issue: using Kotlinx serialization in AppCode, in a class that is marked Serializable, the serialize method that should be generated by the compiler is not found when building the iOS Framework. Known issue? Any fix I can apply?

similar to @Nikky above I am a bit stumped where to go next when an api response either empty object

{}

or the structure that my serialiser expects e.g.

{"id": "ABC123", "status": "STATUS"}

. I have tried a number of approaches that i’ve documented on this SO ticket; https://stackoverflow.com/questions/56541201/parsing-empty-object-with-kotlinx-serialization Would anyone be able to point out where I am going wrong?

Is there a way to override the

encodeDefaults

value for a given field? I have a

type

field that I'm using to distinguish subclasses. Obviously, I set the val in each subclass, but when I'm deserializing, I only know it's the superclass and without the

type

, there's no way to know which subclass to deserialize to.

Hi, I have encountered an error because of discriminator field name clash:

sealed class A {

    @Serializable
    data class B(val type: String) : A()
}

@Test
fun main() {
    val json = Json(
        configuration = JsonConfiguration.Common,
        context = SerializersModule {
            polymorphic<A> {
                addSubclass<A.B>()
            }
        }
    )

    val s = PolymorphicSerializer(A::class)
    val j = json.stringify(s, A.B(type = "Test"))

    json.parse(s, j)
}

The code will produce error:

Test is not registered for polymorphic serialization in the scope of class A

The error occurs because there are two

type

fields. If it is possible it would be nice that this name clash issue would be reported at compile time or if it is not possible I think there should be a better error message that states that one has two

type

fields and it is impossible to resolve the polymorphic type. What do you think?

On that note - what is the reason that the discriminator field name is set globally rather than on a per-type/serializer basis? Depending on what model you consume (or produce) it may be necessary to have it named differently for different types.

Did the structure of

kotlinx-serialization-runtime

modules change from

0.11.0

to

0.11.1

? Having only a common dependency to

kotlinx-serialization-runtime:0.11.0

works. With

0.11.1

this doesn't work anymore. It cannot find the classes and the module has no metadata thus Gradle doesn't automatically resolve

common

,

jvm

etc.

Hey all, getting my feet wet with Kotlinx Serialization and have a question: if I have an API request (in JSON) form which I only need, say, 3 primitives from for my usecase, what is the best practice way to define a @ Serializable data class to process this request? Do I have to generate a data class with every possibly entry and set default values, or can I just make a data class that only has the primitives I need and process it before the data class is generated somehow?

📣 kotlinx.serialization

0.11.1

has been released. This release is binary compatible with Kotlin/Native 1.3.40. This is mostly a patch release, see notes here: https://github.com/Kotlin/kotlinx.serialization/blob/master/CHANGELOG.md#v0111--2019-06-19

After upgrade to 0.11.1 I have problems resolving

kotlinx-serialization-runtime-js

module. I've noticed the

kotlinx-serialization-runtime-js-0.11.1.jar

contains

kotlinx-serialization-kotlinx-serialization-runtime.js

file and the previous

kotlinx-serialization-runtime-js-0.11.0.jar

contains

kotlinx-serialization-runtime.js

file. Is it intentional or is it a bug?

How do I serialize/deserialize to/from a simple String using

kotlinx.serialization

?

@Serializable
class Wrapper(val test : Test)

enum class Test {
    @SerialName("Bar")
    Foo
}
  println(json.stringify(Wrapper.serializer(), Wrapper(Test.Foo)))

This prints

{test: "Foo"}

, I would've expected

{test: "Bar"}

though, what am I doing wrong?

I think I found a bug.

JsonElement.booleanOrNull

doesn't check to see whether

isString

is true, so

parse("true").booleanOrNull

and

parse("\"true\"").booleanOrNull

both return

true

, even though I think the secord one should return

null

.

Is there a built-in serializer to "inline" singular-field classes? Example:

@Serializable(InlineSerializer::class)
    class Inlined(val str :String)

   fun main(){
        val obj = Inlined("test")
        val str = json.stringify(Inlined.serializer(),obj)
        assertEquals("\"test\"",str) // And not {"str":"test"}
   }

I need some help. I am trying to set up a custom annotation that will allow me to set a data format value for the my external parser to use. Something like seen here, but with a customizable format (https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/custom_serializers.md#external-serializers-for-library-classes). My goal data declaration would be something like:

class MyObject {
   @Format("mm/dd/yyyy")
   @Serializable(with = MyDateSerializer::class)
  val poorlyFormattedDate: Date
}

Any way to get the Format data from within the MyDateSerializer (without writing a whole custom parsing class for every model in my app/library? Thank you!

I am trying to find an example of working Polymorphic serialization with sealed class hierarchy and for now found only some scraps in commit history of kotlinx.serialization. Do anybody have a reference. My class hierarchy looks like this https://pastebin.com/59usEBxS and I need to have a List of those, which will be transformed into XML (via @pdvrieze plugin) and read back depending on tag name.

Is there a way to pretty-print a

JsonObject

in kotlinx.serialization ?

When kotlinx.serialization support (to CBOR format) for native (ios) is expected?

is there any way to debug bad bytecode generated by the serialization plugin?

I don’t how to repro this but I had an issue uploading a build of my app to the Google playstore and it turned out to be a problem with applying the serialization plugin. In my case, I applied the serialization plugin to an android library module that the main app module depended on and uploading the app to the google play store failed with “some parts of the apk were not signed correctly” (paraphrasing)

Hello! Does inheritance supported? For example: class A { .... } class B : A { .... } val a : A = deserialize(serialize(B())) // a has runtime type of B

Where does the code that does the annotation processing live in the serialization repo? I can't find it anywhere?

are there any android libraries that work with androidx serialization out of the box?

Hello, currently I'm using

PolymorphicSerializer

for sealed class like this

@Serializable(PolymorphicSerializer::class)
sealed class Response {

    @Serializable
    data class Success(val token: Token) : Response()
        
    // serializer defined in serial module
    object Failure : Response()
}

I found this section in doc comment of

@Polymorphic

annotation.

Does not affect sealed classes, because they are gonna be serialized with subclasses automatically with special compiler plugin support which would be added later.

At first I thought I could use

@Polymorphic

instead of

@Serializable(PolymorphicSerializer::class)

but it does not work that way. Will this approach change in the future?

hi all! can anyone help me with enum serialization? i have enum values 1,2,3,4 and write this enum:

enum class Status {
    @SerialName("1")
    ACTIVE,
    @SerialName("2")
    BLOCKED,
    @SerialName("3")
    WAIT_UPDATE_PROFILE,
    @SerialName("4")
    WAIT_APPROVE;
}

but serialization can't parse Status:

kotlinx.serialization.SerializationException: com.icerockdev.generated.ktor.models.RelativeProfileResponse.Status does not contain element with name '1'

enums not support

@SerialName

?

Configuring polymorphic serialization by tag/ID is proving surprisingly difficult due to the lack of documentation. Are there any resources I should look at?

Just getting my grips with kotlinx.serialization. If I have a class

MDCacheItem

which is

@Serializable

(and I do, I've got that working fine and have written custom serializers), what do I need to do to serialize a

Set<MDCacheItem>

?

val jsonData = json.stringify(MDCacheItem.serializer(), setToCache)

is not allowed.

Inline class serialization/deserialization doesn’t work in

1.3.50-eap-5

even with custom serializer.

@Serializable(with=KeySerializer::class)
inline class Key(val source:String)

Error:

Inline class serialization not supported

No problem in

1.3.41

. Is it planned regression for

1.3.50

?

@serebit So I was also having problems getting polymorphic deserialization to work, using Moshi. I switched to Klaxon and got it working without too much trouble. Just something to consider if you still didn't get it working.