Avro to Scala case class annotation with nested types - scala

Question

I am using Avro serialization for messages on Kafka and processing with some custom Scala code using this annotation method currently. The following is a basic schema with a nested record:
{
"type": "record",
"name": "TestMessage",
"namespace": "",
"fields": [
{"name": "message", "type": "string"},
{
"name": "metaData",
"type": {
"type": "record",
"name": "MetaData",
"fields": [
{"name": "source", "type": "string"},
{"name": "timestamp", "type": "string"}
]
}
}
]
}
And the annotation, I believe should quite simply look like:
#AvroTypeProvider("schema-common/TestMessage.avsc")
#AvroRecord
case class TestMessage()
The message itself is something like the following:
{"message":"hello 1",
"metaData":{
"source":"postman",
"timestamp":"123456789"
}
}
However when I log the TestMessage type or view the output in a Kafka consumer in the console, all I see is:
{"message":"hello 1"}
And not the subtype I added to capture MetaData. Anything I am missing? Let me know if I can provide further information - thanks!

Answer 1

This should now be fixed in version 0.10.3 for Scala 2.11, and version 0.4.5 for scala 2.10
Keep in mind that for every record type in a schema, there needs to be a case class that represents it. And for Scala 2.10, the most nested classes must be defined first. A safe definition is the following:
#AvroTypeProvider("schema-common/TestMessage.avsc")
#AvroRecord
case class MetaData()
#AvroTypeProvider("schema-common/TestMessage.avsc")
#AvroRecord
case class TestMessage()