Adding a edge for existing vertices [TP3]

[smunx]

Hi,

I am using tinkerpop 3 and TinkerGraph

• I would like to know if its possible to add an edge to a existing vertex in tinkerpop 3 ?
• I see that addE has been removed (http://tinkerpop.incubator.apache.org/javadocs/3.1.0-SNAPSHOT/full/org/apache/tinkerpop/gremlin/process/traversal/dsl/graph/GraphTraversalSource.html) is there an alternative ?
• And also in order to add a edge I need a TinkerVertex object. How can I get a vertex object while I am iterating through the vertices ?   So that I can use the addEdge method (http://tinkerpop.incubator.apache.org/javadocs/3.1.0-SNAPSHOT/full/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerVertex.html#properties)

--Thanks

[Daniel Kuppitz]

You can't add an edge by only using a GraphTraversalSource (e.g. g.addE(...)), but you can edges within a traversal:

g.V().as('a').out('mother').as('b').addE('child').from('b').to('a')

The JavaDocs you should be looking at are these:

http://tinkerpop.incubator.apache.org/javadocs/3.1.0-SNAPSHOT/full/org/apache/tinkerpop/gremlin/process/traversal/dsl/graph/GraphTraversal.html

Cheers,

Daniel

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[smunx]

Hi Daniel,

Can you please explain the above query in detail ?

But what about the newly created vertex that dose not have a connection with the graph yet ? 

And should I specify the vertex index id if I want to target a specific node ?

   g.V(13).as('a').out('mother').as('b').addE('child').from('b').to('a')

Thanks

[Daniel Kuppitz]

But what about the newly created vertex that dose not have a connection with the graph yet ? 

Maybe show your code..? If you have a reference to a vertex, then you can simply do this:

existingVertex.addEdge("label", otherVertex)

Since this is pretty basic stuff, it's probably worth to give the Getting Started tutorial a read.

Cheers,

Daniel

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[Michalis Michaelidis]

I think what you are trying to do could be done like that:

g.addV("SomeLabel").as("newA").V(existingBId).as("existingB").addE("SomeEdge").from("newA").to("existingB")