Not able to retrieve node property

[Nikhanj]

Hi,

   I have a list of vertices in a list like - vertexList=[48,47]

   Now I want to traverse this list and get the node property "Type" of its previous node. 

  So I wrote this script

   i=-1; vertexProperty=[]

   while(++i<vertexList.size()) vertexProperty[i]=vertexList[i].in('CATEGORY').Type

  But in the vertexProperty list I did not have the property value stored, rather had information about pipes like-

 

 [StartPipe, InPipe(CATEGORY), PropertyPipe(Type)]

 [StartPipe, InPipe(CATEGORY), PropertyPipe(Type)]

How to get the property from these pipes ???

Regards,

Nikhanj

[Nikhanj]

Hi,

can anyone help with this issue ??

[Andres Taylor]

I have no idea what you are asking about. You write about pipes and vertices. If this a gremlin question? You have to give us a little more information before we can help.

Andrés

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[Nikhanj]

I have id's of vertices stored in a list like vertexList=[48,2750]

Now for the node with ids in the above list, I want to access its incoming edge :CATEGORY and access the node property:Type.

For that i tried 

    i=-1;

   vertexProperty=[];

   while(++i<vertexList.size()) vertexProperty[i]=vertexList[i].in('CATEGORY').Type

  But in the vertexProperty list I did not have the property value stored, rather had information about pipes like-

 

 [StartPipe, InPipe(CATEGORY), PropertyPipe(Type)]

 [StartPipe, InPipe(CATEGORY), PropertyPipe(Type)].

But when i try for individual id like vertexList[0].in('CATEGORY').Type ,i am able to get the property-Type, correctly

On iterating the list of ids ,it is not coming as expected

[Peter Neubauer]

Nikhanj,
you need to pull out the first element from the propertyPipe, like


i=-1;
vertexProperty=[]; 

vertexList=[0]; 

while(++i<vertexList.size()) {

  vertexProperty[i]=g.v(vertexList[i]).in('CATEGORY').Type.next(); 

}

vertexProperty

/peter

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[Peter Neubauer]

Hi all,

since this comes up all the time, I added it as a tip to the docs, should be up soon at http://docs.neo4j.org/chunked/snapshot/gremlin-plugin.html

/peter

[Nikhanj]

Peter,

As per your code,

     i=-1; 

vertexProperty=[]; 

vertexList=[0]; 

while(++i<vertexList.size()) {

  vertexProperty[i]=g.v(vertexList[i]).in('CATEGORY').Type.next(); 

}

vertexProperty

But if you do, vertexList=[0],the value 0 will be stored in vertexList and how will it correspond to pulling first element from propertyPipe..I tried your code without vertexList=[0], and I am able to get Type value. Thanks!

[Peter Neubauer]

Glad to be able to help :)

/peter