CODEWITHSUNDEEP
neo4jcypher
Old Programmer
Old Programmer

Reputation: 554

How to update existing relationship in neo4j?

I have two nodes A and B. They have a relationship R, with some property P, on this relationship.

How I can update this relationship R, with a new value for P? I tried merge, but this creates a new relationship, but I want to update the existing one.

Upvotes: 5

Views: 16510

Answers (2)

artemitSoft
artemitSoft

Reputation: 302

Match (a:A), (b:B) Merge (a)-[r:YourRelations]->(b) Set r.P="new Prop" Return r

Before

After

Upvotes: 3

InverseFalcon
InverseFalcon

Reputation: 30397

Match on your nodes and the relationship, then use SET to update the relationship property. For example:

MATCH (a {name:"A"})-[r]-(b {name:"B"})
SET r.P = "bar"

It's generally best, when looking up specific nodes, to use labels in the query, and have an index or unique constraint (whichever makes the most sense) to speed up your lookups.

Upvotes: 19

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