neo4j create node if property of node does not match

Question

i have a node.js app where i have to create a unique user based on the username property of a node such as

(:USER {name:'username',password:'pass123'})

so i want to run a query that checks if a user with the given username exists or not and if not then create the node and set its password.

I am thinking about which way to go.. either create a CONSTRAINT or use CREATE UNIQUE ON MATCH ON CREATE or first run a MATCH query and if it returns data then run CREATE query based on the result

i am using the neo4j-driver for node and the query run returns the result Obj

Answer 1

Sounds like name on :USER is meant to be unique in your model, so creating a unique constraint on this is the way to go.

As for the creation of the node itself, using MERGE along with its ON CREATE clause should do the trick.