Hybrid dual database Neo4j and Postgres based Application

Hello, I want to build a application with graph db that will also use RDBMS already existing and serving another application. I want application supporting operation that will query from both database.
I have explored neoid gem but it is very old not maintained and ubstable.
Can anyone Please help

What language are you writing your application in? There are drivers for Neo4j for all they popular languages? I'd think you should be able to query both databases in your application whenever you need to go to one or the other.

I am writing application in ruby on rails

for ruby maybe ??? maybe ? try http://neo4jrb.io/