CODEWITHSUNDEEP
neo4j
Emmanuel
Emmanuel

Reputation: 47

Performing time-based actions on node

How do I trigger an action to be performed (set the property to something) on a node after a particular time in neo4j?

I know about the graphaware's neo4j-expire, but it only deletes nodes or relationships when the time is up, which is not what I want?

Upvotes: 1

Views: 188

Answers (1)

stdob--
stdob--

Reputation: 29147

You can use a combination of apoc.date.expireIn and apoc.trigger procedures. For example first add trigger:

CALL apoc.trigger.add('doVertexTask', '
      UNWIND {deletedRelationships} AS dRel
      WITH dRel WHERE type(dRel) = "taskRelation"
      WITH endNode(dRel) AS vertexNode WHERE "Vertex" IN labels(vertexNode)
      SET vertexNode.prop = rand()
      RETURN true', 
    {phase: "before"})

Then add the data and task:

MERGE (A:Vertex {id: 1})
CREATE (T:TASK)
CREATE (T)-[:taskRelation]->(A)
WITH A, T
CALL apoc.date.expireIn(T, 10, 's')
RETURN A, T

Upvotes: 1

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