When using SerialName, the Bson document generated by kmongo is incorrect

[FishHawk]

When using SerialName, the Bson document generated by kmongo is incorrect.

Code:

@Serializable
data class BookEpisode(
    ...
    @SerialName("paragraphsZh")
    val baiduParagraphs: List<String>?,
    val youdaoParagraphs: List<String>? = null,
)

println(setValue(BookEpisode::youdaoParagraphs.pos(0), "test").toBsonDocument())
println(setValue(BookEpisode::baiduParagraphs.pos(0), "test").toBsonDocument())

Output:

{"$set": {"youdaoParagraphs.0": "test"}}
{"$set": {"paragraphsZh.paragraphsZh": "test"}}

[miguelalexteixeira]

Found a similar issue with posOp. When adding an array positional operator, the lib is creating an instance of CustomProperty which inherits the annotations from the previous path property:

private class CustomProperty<T, R>(val previous: KPropertyPath<*, T>, path: String) : KProperty1<T, R> {
    override val annotations: List<Annotation> get() = previous.annotations
    // ...
}

When resolving the property path, it calls calculatePath in SerializationClassMappingTypeService, which will return the SerialName's value:

override fun <T> calculatePath(property: KProperty<T>): String =
    property.findAnnotation<SerialName>()?.value
        ?: (if (property.hasAnnotation<MongoId>()) "_id" else property.findAnnotation<MongoProperty>()?.value)
        ?: property.name

[zigzago]

Thank you for reporting. Will be fixed in next release (coming soon)