Here is an example of query
Keymaker.service.execute_cypher("START n=node:skillindex('*:*') MATCH (n)-[:belongsTo]->(x)<-[:belongsTo]-(y) , n-[:relatedTo*2..2]-y WHERE n.name IN [{names}] RETURN DISTINCT y limit 12", {names: skill_names})
I also tried {names: skill_names.map{|skill| "'#{skill}'"}.join(', ')}), IN [{names}] and just IN {names}