apoc.schema.relationship.constraintExists

Details
Syntax	`apoc.schema.relationship.constraintExists(type, propertyName)`
Description	Returns a `BOOLEAN` depending on whether or not a constraint exists for the given `RELATIONSHIP` type with the given property names.
Arguments	Name	Type	Description
	`type`	`STRING`	The relationship type to check for a constraint on.
	`propertyName`	`LIST<STRING>`	The property names to check for a constraint on.
Returns	`BOOLEAN`

This function is not considered safe to run from multiple threads. It is therefore not supported by the parallel runtime (introduced in Neo4j 5.13). For more information, see the Cypher Manual → Parallel runtime.

Usage Examples

The examples in this section are based on a database that has applied the following constraints:

CREATE CONSTRAINT likesDay
FOR ()-[like:LIKED]-()
REQUIRE (like.day) IS NOT NULL;

RETURN apoc.schema.relationship.constraintExists("LIKED", ["day"]) AS output;

Results
output
TRUE

More documentation of apoc.schema.relationship.constraintExists