UNIQUE Constraints for relationship for example Marriage (:Men)-[:MARRIED]-(:Women)

[shubham_jaizz00]

(:Men)-[:MARRIED]-(:Women)

One men should marry one women i want to force this in db how do i implement this using cypher query

[stefan_armbrust]

Cardinality constraints are not yet implemented, you might see them in an upcoming release.

Meanwhile you can implement that behaviour yourself using a TransactionEventHandler.

[arentschler]

Hi Stefan -- Any news on implementing "Cardinality Constraints"? This would be very helpful for us to maintain the integrity of our schema. Will Neo4j 4.0 have this?

[stefan_armbrust]

Unfortunately this won't be in 4.0, but it's rather high on the backlog.