Dijsktra and Neo4j :: Rails

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Manolo Velduque

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Feb 11, 2015, 12:04:32 PM2/11/15
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Hello! How is it possible to use Dijsktra in
Neo4j :: Rails ?, is used in the same way?

Neo4j::Algo.dijkstra_path(@x,@y).cost_evaluator{|rel,*| rel[:weight]}

Thank You!

Brian Underwood

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Feb 11, 2015, 2:12:40 PM2/11/15
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We haven't been focusing on algorithms for a bit in the gem (though
it's not something that we're opposed to). I think you have two
options:

You can work in embedded more and use the java APIs directly:
http://neo4j.com/api_docs/2.0.3/org/neo4j/graphalgo/GraphAlgoFactory.html

Also see the neo4j-core API for how we support neo4j java objects in Ruby:
https://github.com/neo4jrb/neo4j-core/wiki

Secondly, you can hit the REST endpoint:
http://neo4j.com/docs/stable/rest-api-graph-algos.html#rest-api-execute-a-dijkstra-algorithm-and-get-a-single-path

The neo4j and neo4j-core gems don't currently support these endpoints,
but you can use a library like Faraday or httparty (maybe even
neography, not sure). It would probably be cool if we could support
hitting arbitrary endpoints in neo4j and returning node/relationship
objects.

Brian
;p
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