2011/4/25 Chris Gioran chris.gio...@neotechnology.com:
If I understand you correctly, you want to create groups of your nodes
+ relationships that exist in your graph. The way you do that depends
on some things.
1. What is the degree of logical separation you desire? If two nodes,
A and B have a relationship in common, will they always end up in the
same category? If not, should the relationship remain?*
2. How do you plan to access those nodes? If you want to find out the
category of nodes and relationships as you iterate over your data,
then maybe a tagging property would work. If you want direct access to
the nodes that belong to a category, an option is a supernode which
represents that category and have it relate to every node that belongs
to it.
Creating a tagging property has the advantage of being indexable and
works both on nodes and relationships. A supernode (the quotes are
justified since we are talking about a simple node that just receives
special semantics, not some inherently different node kind) is a more
graphy way of doing things and probably faster too.
Example of tagging property:
// Add
Node resource = graphDb.createNode();
resource.setProperty( category, some category );
categoryIndex.add( resource, category, resource.getProperty(
category ) );
// Get
for ( Node resource : categoryIndex.get( category, some category ) ) {
// Each resource with that category
}
Example of having the tags as nodes with relationships to its group members:
// Add
// TODO: check if the category you're creating exists first,
// or create all categories up front
Node category = categoryIndex.get( name, some category ).getSingle();
Node resource = graphDb.createNode();
resource.createRelationshipTo( category, CATEGORY );
// Get
Node category = categoryIndex.get( name, some category ).getSingle();
for ( Relationship rel : category.getRelationships( CATEGORY,
Direction.INCOMING ) ) {
Node resource = rel.getStartNode();
}
Where the latter solution is traversal friendly, whereas the former isn't.
I am sure there are other ways and I would also like to see how people
categorize entities in their graphs.
*What currently cannot be done is role-based hard separation of
nodes. Suppose there are two nodes, a and b with a relation a--b. Say
a ends up in category A and b in category B and the relationship
stays. If someone with access to A accesses a, then she will be able
to access b, no matter what.
cheers,
CG
On Mon, Apr 25, 2011 at 9:53 PM, pooja naik npooj...@yahoo.com wrote:
Hi Chris,
Thanks for a prompt response.
I am trying to create a Network Graph Infrastructure for SP 's , in such a
way that they can lease out the parts of this network infrastructure to
other small companies.
This requirement make it necessary to create a logical boundary on the main
Network graph , in other words to create a overlay graphs on the underlying
physical graph.
Does categories would still help me here?
Is there any another way to do it?
Let me know
Thanks n Regards
Pooja
From: Chris Gioran chris.gio...@neotechnology.com
To: Neo4j user discussions user@lists.neo4j.org
Sent: Monday, April 25, 2011 11:34 AM
Subject: Re: [Neo4j] Regarding Sub grouping In Graph DB
Hi Pooja,
what would qualify as a subcategory in your use case?
The most straightforward thing I can come up with is a property in
each node named category or something similar, that has an
enumerated value (not a Java Enumeration but something treated as
such) that would place the node in its category. This is one of many
ways to go ahead, depending on what degrees of separation you want,
flexibility etc.
Could you elaborate a little on what you are trying to do?
cheers,
CG
On Mon, Apr 25, 2011 at 9:27 PM, pooja naik npooj...@yahoo.com wrote:
Hi all,
I am using ne04j for a IP network resource graph in my project.
I would like to know whether there is a way to divide the graphical
network into sub categories in neo4j?
Any help or pointers is appreciated.
Thanks
Pooja
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Mattias Persson, [matt...@neotechnology.com]
Hacker, Neo Technology
www.neotechnology.com
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