CODEWITHSUNDEEP
orientdb
Rivas
Rivas

Reputation: 123

Use edge during traverse in while for Orientdb

I have a database with classes users, groups, and networks. Users can have out_ edges to groups or networks. Groups can have out_ edges only to networks. There are three different types of edges, admin, write, and read.

I want to be able to retrieve networks a user has permissions to. The easiest way to do this would be to look at the edges connecting users, groups, and networks. I am trying the following:

select from (traverse out() from <User Record RID> 
                            while $depth <=2 
                            AND ( (@class = 'group' AND <edgeType = write>
                                 OR (@class = 'network' AND <edgeType = read>) 
                                 OR @class ='user') ) 
       where @class = 'network'

How can I write the boolean 

 <edgeType = write>

in the context of the of the current traversal.

Upvotes: 1

Views: 2110

Answers (1)

Lvca
Lvca

Reputation: 9060

From a vertex (you're jumping from vertex to vertex skipping edges with out()) You can use inE() to get the incoming edge and outE(). So try to add:

inE().@class = 'WriteEdge'

If you have one class per edge type (suggested). Or you can also do:

inE('WriteEdge').size() > 0

Otherwise you could not skip edges in traversal but traverse vertex and edge, adding WHILE conditions that match edges and vertices. Example:

select from (traverse outV(), outE() from <User Record RID> 
                        while $depth <=4 
                        AND ... )
   where @class = 'network'

Another option is move forward and check back the traversed vertices and edges with the functions:

  • traversedVertex()
  • traversedEdge()
  • traversedElement()

Use -1 to get last traversed. -2 the one before last, etc.

Upvotes: 2

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