如果不存在关系，新主义就存在

Question

I've only just started using neoism and enjoying it so far. I've hit a bit of a problem and wondered if it my naivety of neoism or neoism itself that's at fault.

I've got a line in my go code:

agent.Relate(relation, node.Id() , neoism.Props{})

The issue is that if I run it more than once it will duplicate the relationship. Is there a way to create only if the relationship doesn't already exist - something similar to the GetOrCreateNodeFunction.

Or will I have to write some raw cql to check if the relationship already exists before running the statement above?

Thanks in advance

Answer 1

There is not a native function or REST endpoint for creating unique directed relationships. You might assign a unique property value to each relationship and add a unique index on the relationship property, or you might use a cypher query and the CREATE UNIQUE clause.

http://neo4j.com/docs/stable/query-create-unique.html#_create_unique_relationships