I'm confused by the way to implement `AbstractEnco...

# serialization

[CLOVIS]

I'm confused by the way to implement AbstractEncoder .

Let's say I want to serialize:

@Serializable
class User(val id: Int)

From what I understand, KotlinX.Serialization will call:

MyEncoder.beginStructure(User.serializer.serialDescriptor).apply {
    encodeInt(1234)
    endStructure(User.serializer.serialDescriptor)
}

What I don't understand is: when encodeInt(1234) is called, how do I know it's the field id and not another field that could exist? Am I supposed to store the serialDescriptor of the enclosing class, keep track of the index of the last written element, and use that to query the descriptor to know what the field is?

TL;DR: within the implementation of encodeInt() I need to find to know the current field's name, but I don't know how to.

[Adam S]

iirc id should be encoded using AbstractEncoder.encodeElement(descriptor: SerialDescriptor, index: Int) (which will eventually call encodeInt())

[Adam S]

maybe the kdoc for beginStructure(...) helps

https://github.com/Kotlin/kotlinx.serialization/blob/4667a1891a925dc9e3e10490c274a875b0be4da6/core/commonMain/src/kotlinx/serialization/encoding/Encoding.kt#L230-L263

[CLOVIS]

Thanks!