Support Kotlin data classes

[slavaatsig]

Because why not?
It started as a StackOverflow question and I wonder if amazing geniuses behind ArangoDB could elaborate more about a possibility of such support?

[mvollmary]

@slavaatsig Thanks for your input. I will take a look at it. Meanwhile I answered your question with a workaround using Jackson.

[rashtao]

@slavaatsig Thanks for reporting!

In your code you should use:

arango.setSerializer(VelocyJack...

instead of:

arango.serializer(VelocyJack...

otherwise you only use it for serializing and not for deserializing.

I created a pull request which you can use as workaround, using the kotlin no-arg maven plugin, here:
https://github.com/slavaatsig/arangodb-jackson-dataformat-velocypack-issue/pull/1/files

Even if the jackson KotlinModule works with data classes (as I verified here: https://github.com/rashtao/arangodb-jackson-dataformat-velocypack-issue/blob/dbg_serde/src/main/kotlin/com/example/issue/main.kt#L16-L21 ), somehow the driver tries accessing the no-arg constructor...

I will investigate further about it.

[slavaatsig]

Great thanks @rashtao for the workaround! It worked for me for both cases when my data-class inherits from DocumentEntity or if I specify properties _key, _rev, _id explicitly.

Wait to hear from you regarding your investigation results.

[rashtao]

fixed since java-velocypack 2.2.0: https://github.com/arangodb/java-velocypack#kotlin-data-classes