CODEWITHSUNDEEP
gremlingraph-databasestinkerpopamazon-neptune
xeroshogun
xeroshogun

Reputation: 1092

Get a boolean value if an edge exsists in gremlin

I want to do a simple query in which I have a user and a group. Users have an edge "memberOf" to group vertex. Given a userId and a groupId, I want to write a query that returns true or false if there is an edge between the user and the group.

Upvotes: 2

Views: 471

Answers (2)

Kelvin Lawrence
Kelvin Lawrence

Reputation: 14371

Just adding a second answer to mention that you can also use the hasNext step for this. It will return true or false depending on whether the target exists.

g.V().hasId('userid').
      out().hasId('group1').
      hasNext()

Upvotes: 3

PrashantUpadhyay
PrashantUpadhyay

Reputation: 877

You can use coalesce to do such operation.

g.V().hasId('userid').coalesce(out().hasId('group1').constant(true), constant(false))

Upvotes: 2

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