Scala case class recursion

Question

I am writing a recursive function

Can we use a case classs 'A' inside of the same case class 'A'

Ex:

case class FramesFolderData(key: String, title: String, parentId: Long, children: Option[List[FramesFolderData]])

It is working fine but I just got a doubt that might be anything wrong in it or may be is it a bad practice — Garapati Anil
– Garapati Anil, Commented Feb 4, 2019 at 11:52

Tim · Accepted Answer · 2019-02-04 12:14:19Z

4

Yes, this is valid Scala and is a good way to define a recursive data structure.

I would recommend removing the Option in the children field. You can indicate "no children" with an empty list (Nil) so there is probably no need to use an Option as well.

answered Feb 4, 2019 at 12:14

Tim

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3 Comments

James Whiteley Over a year ago

If the point of this is to convert it to/from JSON (I noticed the playframework tag and that's a pretty common use case with play), the Option is relevant otherwise any JSON read without that field would cause the JSON-to-case class conversion to fail. I could be wrong about the use case though. :)

Tim Over a year ago

@JamesWhiteley Good thought. I removed the playframework tag because I thought it wasn't relevant, but I have put it back in case you are right about the use case.

Garapati Anil Over a year ago

I am using it for play framework only. Thanks you James and Tim :)

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