CODEWITHSUNDEEP
neo4jcypherconstraints
alexanoid
alexanoid

Reputation: 25770

UNIQUE constraint for Neo4j relationship property

I know how to create an index on the relationship property in Neo4j:

CREATE INDEX IF NOT EXISTS FOR ()-[r:CONTAINS]-() ON (r.uuid)

but how to add UNIQUE constraint to r.uuid there?

Upvotes: 2

Views: 526

Answers (1)

nimrod serok
nimrod serok

Reputation: 16033

EDIT: According to Michael Hunger from neo4j and stdob--, this is not yet possible.

**

I can't check it, since I don't have the Enterprise edition,

but If I combine the docs example for Unique node property constraints:

CREATE CONSTRAINT constraint_name FOR (book:Book) REQUIRE book.isbn IS UNIQUE

With the docs example for Relationship property existence constraints:

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

I can only assume that when it is possible, its syntax will be:

CREATE CONSTRAINT constraint_name FOR ()-[r:CONTAINS]-() REQUIRE r.uuid IS UNIQUE

Upvotes: 1

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