title: Neo4j Cypher : transfer all relationships before replacing a node by another
body: <p>I'm trying to transfert all ingoing and outgoing relationships from a node to another, before deleting the first one. they both have the same label.
  I saw this <a href="https://stackoverflow.com/questions/21634936/neo4j-cypher-copy-relationships-and-delete-node">Neo4j Cypher: copy relationships and delete node</a>
  but in my case i don't know the type of the relations and i want to transfer both ingoing and outgoing ones.</p>
  
  <p>i'm looking for either a cypher query or a query based on neo4j.rb</p>