Neo4j mutable Cypher, e.g. creating comments (node + relationships + update stats)

gistfile1.coffee

results = @query _, """
    START author=node({authorId}), target=node({targetId})
    CREATE comment={commentData}
    CREATE comment -[:#{@REL_AUTHOR} {relAuthorData}]-> author
    CREATE comment <-[:#{@REL_COMMENT} {relTargetData}]- target
    SET author.numCommentsBy = COALESCE(author.numCommentsBy?, 0) + 1
    SET target.numComments = COALESCE(target.numComments?, 0) + 1
    RETURN comment
""",
    authorId: author.id
    targetId: target.id
    commentData: @_createNodeData(data)
    relAuthorData: @_createRelationshipData()
    relTargetData: @_createRelationshipData()