Thread by @adamcowley

Detecting and visualising nodes in #neo4j using Neo4j Graph Algorithms and APOC.

This works really well with Neo4j Bloom and will show you whether you're on the right track.

1/

// Run the appropriate Community Detection Algorithm
CALL algo.louvain.stream('User', 'FRIENDS')
YIELD nodeId, community

WITH community, collect(nodeId) AS ids

// Use APOC to create a Virtual Node for the Community
CALL apoc.create.vNode(['Community'], { name: community })
YIELD node AS communityNode

// For each user in that community, create a virtual relationship
UNWIND ids AS nodeId
MATCH (user) where id(user) = nodeId

CALL apoc.create.vRelationship(user, 'BELONGS_TO', {}, communityNode) YIELD rel

// Return the nodes and relationships
RETURN communityNode, user, rel

@neo4j