CODEWITHSUNDEEP
memgraphdb
Juliette Gia
Juliette Gia

Reputation: 148

Getting Node object from Edge in Memgraph

When I am working with an Edge, there is a scenario where I want to find which Node is it, and I only have Memgraph node ID, and not the whole object. And I would want further to make a query with those Nodes I got from Edge property, but I can't as I can't make a query towards database with Memgraph ID of Node.

In other words, it would be good to return Node instead of Node-id in Memgraph when calling edge.start_node or edge.end_node

Upvotes: 0

Views: 134

Answers (1)

Juliette Gia
Juliette Gia

Reputation: 148

The reason for this kind of implementation is twofold. Since the memgraph as per bolt specification returns not nodes but nodes ID when fetching edge, the only way to tackle this issue is from the client-side.

Note there can be two solutions:

  • One would be to implicitly change every user's query to fetch nodes as well and to bind the nodes to edges, which would make another layer of query parsing from the client's side. That would be very complicated (you would need to return all the nodes that could be found in edges). Or make it easier but slower, for every fetched edge perform another query that would get nodes (if that didn't already happen). This solution is needlessly complex

  • Another solution would be to keep the graph structure in memory so that whenever a user would fetch nodes, the structure is in memory and mapped (if possible) to edges. This is how neo4j does it. The issue with this is an obvious inconsistency: sometimes you get an ID and sometimes you get a node.

Upvotes: 0

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