How retrieve all nodes linked by a relationship

1
votes

I am using neo4j, I have nodes with two properties: name and id. I have an index on id. I have relationships "CALL" with a property: "by_test". This property can take different value (id of any node).

Two nodes can have multiple CALL relationships with different by_test property value.

So let's say I have 1..N nodes linked by the same CALL.by_test property value.

Node1 -> Node2 -> Node3 -> .. -> Node N

  • How can I get all these nodes?

    1. Do I need to put an Index on the relationship?

    2. Do I have to create dynamic relationship? Instead of CALL.by_test=value, use value has a relationship.

Thanks!

1
neo4j

1 Answers

1
votes

Using Cypher, you could query for that list like this:

START n=node:node_auto_index(name="one") 
MATCH p=(n)-[r:CALL*1..]->(m)
WHERE ALL(x in r WHERE x.by_test = 3)
RETURN n,m

In the MATCH you bind a term r to the CALL relationships, which you then use in the WHERE clause to check the by_test property of each.

As Michael Hunger noted, the r is a collection of relationships, so the WHERE needs to use ALL to check each of the relationships.