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

Neo4j Graph Platform Cypher
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(:Men)-[:MARRIED]-(:Women)

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

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

Meanwhile you can implement that behaviour yourself using a TransactionEventHandler.

1 Like
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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?

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