Modelling tree structure?

[Jiri Jakes]

Hello.

I'm playing with mongo-scala-driver and wondering whether it is
possible to model a tree. For example comments forming a hierarchy.

article : {
title : "...",
comments : [
{ text : "...", replies : [] },
{ text : "...", replies : [
{ "text : "...", replies : [] },
{ "text : "...", replies : [] }
]
]
}

where:


class Article(val title: String, val comments: List[Comment])
class Comment(val text: String, val replies: List[Comment])


With a help of manga-scala-driver's test in git and wiki I was able to
model a comment list without replies. But I don't know how to add the
replies to the comment. If I naively add


object replies extends ArrayEmbeddedField[Comment]("replies",
_.replies, None) with CommentIn[Comment]


to CommentIn trait, I intuitively feel that it is not correct (and
also does not compile).

Is there a way how to model tree structures with mongo-scala-driver?

Thank you.

[Alexander Azarov]

Hello,

Sorry for the late reply, it seems that Google Groups notification was lost somewhere in Spam mailbox, so I didn't know there is a message waiting for moderation

Mongo-scala-driver requires a lot of boilerplate to express nested structures indeed. This is one of the reasons I've created the next generation library, "Subset". Please see the announcement in the group.

There is a similar example in Subset's documentation, please see here http://osinka.github.com/subset/Sub-document.html I expect you should have no problem creating extra level of nesting or more than one. I'd be grateful if you share your experience

Regards,
Alexander

[Jiří Jakeš]

Hello.

No problem, thank you anyway.

Yes, I just read the announcement and going to observe Subset a bit.
If I discover something interesting, I will share.

J.