Avro4s generic toByteArray / fromByteArray

Question

I has a problems with generic version toByteArray / fromByteArray functions for Avro4s

I found this Avro serialization with generic type issue

this is works:

def fromByteArray[A: SchemaFor : FromRecord](bytes: Array[Byte]): Option[A] = {
    val in: ByteArrayInputStream = new ByteArrayInputStream(bytes)
    val input: AvroBinaryInputStream[A] = AvroInputStream.binary[A](in)
    val result: Option[A] = input.iterator.toSeq.headOption
    input.close()
    result
  }

but this is not!

def toByteArray[T : SchemaFor : FromRecord](obj: T): Array[Byte] = {
    val byteArrayStream = new ByteArrayOutputStream()
    val output = AvroOutputStream.binary[T](byteArrayStream)
    output.write(obj)
    output.close()
    byteArrayStream.toByteArray
  }

it throws compile exception:

Error:(48, 44) could not find implicit value for evidence parameter of type com.sksamuel.avro4s.ToRecord[T] val output = AvroOutputStream.binaryT Error:(48, 44) not enough arguments for method binary: (implicit evidence$23: com.sksamuel.avro4s.SchemaFor[T], implicit evidence$24: com.sksamuel.avro4s.ToRecord[T])com.sksamuel.avro4s.AvroBinaryOutputStream[T]. Unspecified value parameter evidence$24. val output = AvroOutputStream.binaryT

what i am doing wrong?

upd stupid mistake

def toByteArray[T : SchemaFor : FromRecord](obj: T): Array[Byte] ...

must be

def createByteArray[T : SchemaFor : ToRecord](obj: T): Array[Byte] ...

:D

on problem not solved yet

if one of the field of class is AnyRef

val output = AvroOutputStream.binary[T](byteArrayStream)

failed to compile with : Could not find implicit SchemaFor ...