How to retrieve individual values in the list?

Question

I'm new to Janusgraph database. I have created a property key with cardinality as "LIST" and added that property to a vertex. Now I would like to retrieve individual value of that vertex's property. Currently I'm getting entire list as a string.

youtubeUrls = graph.makePropertyKey('youturls').dataType(String.class).cardinality(Cardinality.LIST).make()

urls = graph.addVertex(T.label, 'urls', 'youturls', ["google.com", "yahoo.com", "geekbull.in"])

I am not able to get the first value from the list. I tried so many ways like below,

g.V(urls).values('youturls')[0]

But I'm getting entire list as one string. Where am I doing mistake? Any suggestions and solutions are highly appreciated.

score 2 · Answer 1 · answered Apr 04 '19 at 18:06

The way you add the values is wrong, you need to add each String separately.

g.addV('url').
    property(list, 'youturls', 'google.com').
    property(list, 'youturls', 'yahoo.com').
    property(list, 'youturls', 'geekbull.in').iterate()

Then, when it comes to querying, you can access a specific value like this:

gremlin> g.V().map(values('youturls').range(0,1))
==>google.com
gremlin> g.V().map(values('youturls').range(1,2))
==>yahoo.com
gremlin> g.V().map(values('youturls').range(2,3))
==>geekbull.in

How to retrieve individual values in the list?

1 Answers1