kotlinlang #serialization

. I'm happy to provide a pull request, but there's more than one way to do this and I don't want to spend time and then discover I've picked a way the maintainers don't like.

Toddobryan

06/27/2019, 6:26 AM

In the meantime, you can add these to the

JsonTreeTest

to verify the problem:

Toddobryan

06/27/2019, 6:27 AM

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@Test
    fun testParseBoolean() {
        assertEquals(true, parse("true").booleanOrNull)
        assertNull(parse("\"true\"").booleanOrNull) // currently fails
    }

    @Test
    fun testParseNumeric() {
        assertEquals(123, parse("123").intOrNull)
        assertNull(parse("\"123\"").intOrNull) // currently fails
    }

mathew murphy

07/19/2019, 4:56 PM

I'm hitting a wall on polymorphic serialization/deserialization too.

mathew murphy

07/19/2019, 4:59 PM

I'm about ready to resort to Map<String, Any> and deal with it at runtime 😕

rrader

07/20/2019, 6:30 AM

Also looking for polymophysm

Matej Drobnič

07/28/2019, 7:00 PM

maybe some magic through reified?

Nezteb

08/02/2019, 6:30 PM

It looks like the answer is no, but does https://github.com/kotlin/kotlinx.serialization support CSV?

Jeremy

08/07/2019, 2:39 AM

Is ktor mockengine+json supported? When using MockEngine get the error "No transformation found: class kotlinx.coroutines.io.ByteBufferChannel". When using OkHttp Engine works as expected

tylerwilson

08/07/2019, 1:06 PM

I have run into some JSON that has things like “\~“, “\$” and other garbage. I have strictMode false. Is there perhaps an even more lenient mode than this that might let them pass?

ross_a

08/07/2019, 9:10 PM

It's quite possible I'm simply using too many experimental bits of Kotlin together, but has anyone come across the following exception (only after I've added the serialization plugin, but before I've actually annotated anything

@Serializable

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e: org.jetbrains.kotlin.util.KotlinFrontEndException: Front-end Internal error: Failed to analyze declaration ConnectionActorMessage
Cause: Recursive call in a lazy value under LockBasedStorageManager@861713f (GlobalContext)
File being compiled at position: (29,5) in C:/Users/rossd/IdeaProjects/Backlight/src/main/kotlin/com/github/rossdanderson/backlight/serial/SerialService.kt
The root cause was thrown at: LazyAnnotations.kt:-1
        at org.jetbrains.kotlin.resolve.ExceptionWrappingKtVisitorVoid.visitDeclaration(ExceptionWrappingKtVisitorVoid.kt:43)

thana

08/08/2019, 4:00 PM

how is it possible that the context of how a class is used can make compiling this class fail? I have a data class that doesnt look very suspicious but the compiler says that there is bad byte code involved compiling this class. now that i deleted a huge bunch of code around this class WITHOUT TOUCHING IT i t suddenly compiles 😞

Jeremy

08/08/2019, 4:03 PM

Could it be possible it was just a cache issue? Did you try doing gradle clean build on command line?

thana

08/08/2019, 4:03 PM

unfortunately yes, i did - very often inded

thana

08/08/2019, 4:55 PM

i think i got it - it was my inability to ready byte-code-stacktraces

thana

08/08/2019, 4:55 PM

i was looking on the wrong file and now i got the correct one i'am next to finding a minimal test case

Jeremy

08/08/2019, 4:58 PM

ide support is still work inprg, unit tests will be much more reliable executing on gradle command line

Nikky

08/14/2019, 1:31 PM

does this even work? Foo is not

open

and

data

makes it final too right ?

leandro

08/14/2019, 1:31 PM

apologies, I had it marked as open 😞

leandro

08/14/2019, 1:32 PM

I edited the message to add the

open

on both the class and on the property

Dominaezzz

08/16/2019, 1:49 PM

How can I achieve this?

altavir

08/17/2019, 6:55 AM

I've hit my head hard on https://github.com/Kotlin/kotlinx.serialization/issues/378. It seems like the only way to solve it is to declare ancestor class non-serializable and override it in final class which is actually serialized. It could be done, but brings a lot of code duplication.

ankushg

08/21/2019, 9:16 PM

Does

Mapper.mapNullable

not support nested `Map`s? When I try to something like

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@Serializable
data class Wrapper(val nested: Nested)

@Serializable
data class Nested(val string: String)

fun test() {
    val wrapper = Wrapper(Nested("test"))
    val mapped = Mapper.map(Wrapper.serializer(), wrapper)
}

I get a Map with the nested object flattened like

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{
        "nested.string" -> "test"
    }

Instead, what I want is something like:

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{ 
        "nested" -> { // another Map<String, Any?>
            "string" -> "test"
        }
    }

ankushg

08/22/2019, 12:50 AM

^^ It looks like this github issue is basically what I need: https://github.com/Kotlin/kotlinx.serialization/issues/116 If anyone knows of a youtrack ticket I should follow and/or a workaround that doesn't involve serializing to an intermediate

String

, please let me know 🙏

Fudge

08/23/2019, 10:05 AM

Apparently it was a result of forgetting to call

endStructure

...

ankushg

08/27/2019, 9:32 PM

Is there a way to deserialize

dynamic

into a sealed (polymorphic) class using

DynamicObjectParser

, use a different mechanism than the normal

classDiscriminator=SerialName

to determine which concrete type is selected? For context, I'm consuming

dynamic

json objects from an external source (which will be very very hard to change to provide a

classDiscriminator

along with everything). They've got typescript definitions such as:

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type AttributeContentType =
  | {
      word: String;
    }
  | {
      definition: String;
    };

I've represented this in Kotlin as:

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sealed class AttributeContentType
data class WordAttributeContent(val word: String) : AttributeContentType()
data class DefinitionAttributeContent(val definition: String) : AttributeContentType()

In the above case, I'd want something like

js("""{ word: "foo" }""")

to be deserialized into a

WordAttributeContent

by (somehow) seeing that it has the

word

field.

kevin.cianfarini

08/28/2019, 12:50 AM

I have a json object that looks like this

kevin.cianfarini

08/28/2019, 12:52 AM

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{
  data: {
    "children": [ ... ],
    "after": ...
    "before": ...
  }
}

kevin.cianfarini

08/28/2019, 12:52 AM

and I'd like to deserialize it to an object like this

kevin.cianfarini

08/28/2019, 12:53 AM

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data class PaginatedResponse(
    val children: List<Post>,
    val after: String?,
    val before: String?
)