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  1. Java Driver
  2. JAVA-5338

KBson & Polymorphic - Update operations

    • Type: Icon: Bug Bug
    • Resolution: Unresolved
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Kotlin
    • Java Drivers
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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

      I have a big data classes:

      @Serializable
      sealed interface Sample {
           val fieldName: String
      }
       
      @Serializable
      @SerialName("sample1")
      data class SomeSample1(
          override val fieldName: String = "Im sample 1",
          val someMap: Map<String, Sample> = mutableMapOf()
      )
      
      @Serializable
      @SerialName("sample2")
      data class SomeSample2(override val fieldName: String = "Im sample 2")
      

      SerializersModule:

      val serializersModule = SerializersModule {
                  polymorphic(Sample::class) {
                      subclass(SomeSample1::class)
                      subclass(SomeSample2::class)
                  }
              }
      

      Registered codecs:

      val someSample = KotlinSerializerCodec.create<Sample>(
          serializersModule, BsonConfiguration(encodeDefaults = true)
      )
      val codecs = CodecRegistries.fromRegistries(
          CodecRegistries.fromCodecs(*codecs), codecRegistry
      )
      

      In terms of standard Json.encode, this works fine. But if you use the ready-made version for BSON, it gives an error that SomeSample 1 is not registered in the polymophic hierarchy. This is a rather strange behavior, I tried not to use the sealed interface, specifying a class that has a field with a polymorphic value and there was still a mistake. The most interesting thing is if I package one of the classes into an object, and then pass it to KotlinSerializerCodec.create, then it will work. But I don't want to overwrite the entire element of the collection, I only need to overwrite the field in it.

      Example:

      @Serializable
      data class Profile(
           val name: String,
           val sample: Sample
      )
      

      The sample needs to be overwritten, but the error I get does not allow it to be adequately implemented.

      Stacktrace:

      kotlinx.serialization.SerializationException: Class 'SomeSample1' is not registered for polymorphic serialization in the scope of 'Sample'.
      To be registered automatically, class 'SomeSample1' has to be '@Serializable', and the base class 'Nbt' has to be sealed and '@Serializable'.
      Alternatively, register the serializer for 'SomeSample1' explicitly in a corresponding SerializersModule.
      	at kotlinx.serialization.internal.AbstractPolymorphicSerializerKt.throwSubtypeNotRegistered(AbstractPolymorphicSerializer.kt:102) ~[?:?]
      	at kotlinx.serialization.internal.AbstractPolymorphicSerializerKt.throwSubtypeNotRegistered(AbstractPolymorphicSerializer.kt:114) ~[?:?]
      	at kotlinx.serialization.PolymorphicSerializerKt.findPolymorphicSerializer(PolymorphicSerializer.kt:109) ~[?:?]
      	at kotlinx.serialization.internal.AbstractPolymorphicSerializer.serialize(AbstractPolymorphicSerializer.kt:32) ~[?:?]
      	at kotlinx.serialization.encoding.Encoder$DefaultImpls.encodeSerializableValue(Encoding.kt:279) ~[?:?]
      	at kotlinx.serialization.encoding.AbstractEncoder.encodeSerializableValue(AbstractEncoder.kt:18) ~[?:?]
      	at kotlinx.serialization.encoding.AbstractEncoder.encodeSerializableElement(AbstractEncoder.kt:80) ~[?:?]
      

            Assignee:
            nabil.hachicha@mongodb.com Nabil Hachicha
            Reporter:
            iura.andrianov@Yandex.ru Yuri N/A
            Votes:
            1 Vote for this issue
            Watchers:
            4 Start watching this issue

              Created:
              Updated: