David Butler edited this page May 24, 2013 · 2 revisions
Clone this wiki locally

You can split the graph database (and the lucene database) into separated parts by setting the reference node.

Example (using Neo4j::Rails::Model) :

a = User.all[0] # could be any Neo4j node object
b = User.all[1]
Neo4j.threadlocal_ref_node = a  # store this in the current thread
Product.all.size #=> 1
Product.find('name: p') #=> the product p
Neo4j.threadlocal_ref_node = b
Product.all.size #=> 0
Product.find('name: p') #=> nil

If you want to share data between different users, example:

class Shared < Neo4j::Rails::Model
  property :foo
  ref_node { Neo4j.default_ref_node }

When used from rails the thread context variable Neo4j.threadlocal_ref_node is automtically reset after each request (Rack Middleware). The same is true for lucene connections.

Multitenency is supported for both Neo4j::NodeMixin and Neo4j::Rails::Model.

For more information – multitenancy-with-neo4jrb.

In Neo4j there is just one reference node. Neo4j.rb has support for having more than one reference node. Instead of returning the reference node from the Java API, neo4j.rb uses the thread local storage where the user can have his own node as a reference node. By doing that the lucene files will also be prefixed so that the lucene database is also split.