Defaulting values do not work when using it on child objects

[JustinSchwarzwald]

Library Version
graphql-kotlin-spring-server version "6.1.0"
org.springframework.boot version "2.7.2"

Describe the bug
When using a default argument for a child object, the default parameter is given "null" instead of a default value.

To Reproduce
Steps to reproduce the behavior. Please provide:
For a depth of 1

@Component
class DefaultValueQueryDepth1 : Query {
    suspend fun returnTrueIfModelValueDefaults(queryModel: QueryModel?): Boolean {
        return queryModel?.value == "defaultValue"
    }
}
data class QueryModel(val value: String? = "defaultValue")

For a depth of 2

@Component
class DefaultValueQueryDepth2 : Query {
    suspend fun returnTrueIfChildValueDefaults(parentQueryModel: ParentQueryModel): Boolean {
        return parentQueryModel.childQueryModel?.value == "defaultValue"
    }
}
data class ParentQueryModel(val childQueryModel: ChildQueryModel? = ChildQueryModel("defaultValue"))
data class ChildQueryModel(val value: String? = "defaultValue")

Please also see the following repo for the bug : https://github.com/JustinSchwarzwald/GraphQLDefaultingValuesBug

Expected behavior
The child object should receive the default value that is specified.

[JustinSchwarzwald]

linking default arguments
#981

[samuelAndalon]

I think this issue was caused by stop using object mapper to serialize arguments into classes, was able to repro, will check how to fix it.
The reason is that we use reflections to check the arguments of the primary constructor and we map them against the fields of the objects provided as query argument, so in this case childQueryModel does not exists and is evaluated to null, which is passed to the primary constructor of ParentQueryModel

[samuelAndalon]

fix for this will be included in next release

[cryptoki]

@samuelAndalon is there a time frame for the next release, including the fix / upgrade?

[samuelAndalon]

@cryptoki We will release a minor version in the following days.

[samuelAndalon]

https://github.com/ExpediaGroup/graphql-kotlin/releases/tag/6.2.0

[cryptoki]

@samuelAndalon 👍 thanks. first service upgraded, tests successful and runs with graphql-kotlin 6.2.0 🥳