How to find if a relationship of correct type and parameters exists in Neo4j using python neo4jrestclient

Question

Is there a way using the python neo4jrestclient library to determine if two nodes are connected by a specific relationship? I can only provide properties and values as parameters (and not nodes or relationship types) in a call to the query method so after getting a result set, I need to iterate over it and check if the start, end and relationship type are all correct.

ridx = gdb.relationships.indexes['relationship_auto_index']
results = ridx.query('flag:true')
filtered = [r for r in results if r.type=='Link']
# .. code to check start and end

Answer 1

neo4jrestclient supports cypher as query language. So if you have some means of identifying the start and end node, eg index lookup, you can query directly:

START n = node:mynodes(key='someuuidperhaps'), m = node:mynodes(key='otheruuidperhaps')
MATCH n -[r:KNOWS]-m
WHERE r.flag = True
return r

You can match on the direction of the relationship, using -> or <- .

In addition to that, I'd recommend py2neo , which I consider to have the better API.