filter

[Manolo Velduque]

Hi !

Is it possible to filter nodes in the graph algorithms?

e.g.

algs = Neo4j::Algo.all_simple_paths(my,obj).outgoing(:have).incoming(:likes)

I tried everything and it does not seem possible .....

It seems too get all the routes first and then have to cross it to filter

Thanks !!

[Andreas Ronge]

Hi

Well, you could do it in ruby with normal find_all method. If that is too slow, then have a look at Cypher.

I guess it will be something like this

   Neo4j.query(my,obj) do

      my - "r:have|likes*" - obj

      // add condition on relationships r here, or condition on the whole path.

   end 

Read more about cypher here: http://docs.neo4j.org/chunked/stable/query-match.html#match-variable-length-relationships.

Maybe you can also use the Neo4j::Algo expand method, e.g.:

Neo4j::Algo.shortest_path(@x,@y).expand{|node| node._rels(:outgoing, :friends)}

to tell which paths to use.

Cheers

Andreas

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