A Gremlin Query to Return a Results as a Tree?

[James Thornton]

I'm looking at ways to get Gremlin to return query results in tree form, such as returning all the nested comments for a Web page in one query. 

For example:

comment

comment

- comment

- - comment

- - - comment

comment

- comment

Is this a job for paths?

[James Thornton]

Actually, using something like gather might be more appropriate...

comments = []

g.V.out.gather{comments << it}.loop....

...still playing with it though.

[James Thornton]

closer...

g.v(1).out.sideEffect{ x = [it]; li.push(x) }.out.sideEffect{ x << [it] }

[James Thornton]

Ok, here's what I have so far...

comments = []

 g.v(1).in('comment_on').sideEffect{ x = [it]; comments << x; next = true }.in('comment_on').sideEffect{ if (next == true) {  nest = []; x << nest; next = false; } ; nest << it }.loop(4){it.loops < 1000} >> -1 

return comments

However, Rexster returns this...

{"results":["[v[18], [v[30], v[21], v[24], v[27]]]"],"success":true,"version":"0.5-SNAPSHOT","queryTime":4.963128}

...notice that the value of the results list is a single string instead of list items.

[Pierre De Wilde]

An issue has been created for the incorrect Rexster result.

Thanks for reporting,

Pierre

2011/6/25 James Thornton <james.t...@gmail.com>

[stephen mallette]

I'm sure you both got the message update at this point from github
where I commented on the issue, but I'll just mention it here too.
The gremlin script engine is returning the result as a string, so from
Rexster's perspective I think it's doing what it is supposed to do.
Perhaps, Marko can provide some insight...

https://github.com/tinkerpop/rexster/issues/118

Best regards,

Stephen

[James Thornton]

Is the right approach to writing a query like this, or is there a better way?

Is there a way to break up the query into multiple lines so it doesn't have to wrap in your editor?

[Marko Rodriguez]

Hi James,

I'm on travel. I will get you an answer when I settle.

See you,
Marko

[James Thornton]

Cool. Thanks, Marko!

[Marko Rodriguez]

I'm thinking about your query and about making embedded lists based on where you are in the loop (it.loops) is where I'm thinking of going with this... but its sorta ugly... I may have to make a "tree path"-based pipe to make this pretty... perhaps I'm over traveled and not thinking correctly.....

...
..
.

Marko.

http://markorodriguez.com

On Jun 25, 2011, at 8:36 PM, James Thornton wrote:

> Cool. Thanks, Marko!

[James Thornton]

Thanks for looking into that Stephen!