You can create a node type "community-role" with two outgoing relations
"in_community" and "with_role", which respectively point to a "community" and
to a "role". The "user node" can then have a relationship "has_community-role"
pointing to a "community-role" node. Every hypergraph structure can in
principle be modeled in a property graph by introducing an intermediate node. >
Date: Fri, 17 Jun 2011 18:52:55 +0200
> From: [email protected]
> To: [email protected]
> Subject: Re: [Neo4j] Node and Relationships as properties
>
> Peter
>
> This could be a use case:
>
> Let's have "users", "roles", "permissions" and "communities".
>
> Each role is defined as a permissions set. Users have assigned a list of
> roles for every community they belong to.
>
> If roles could be assigned this way (user)--
> (has_role)[community_neo4j] --> (role)
>
> we can manage separately each user, permissions in role and community.
> we don't need to have a set of roles for each community. The communities
> won't be erased if role assignments are enacted. And mainly they could
> be used in custom traversers and patterns.
>
> I agree we are not used to see these kind of handwritten graphs, but how
> can you draw a clean graph and use it in neo4j with referential
> integrity without the ability of having a node as property value?
>
> Regards
> Aniceto
>
> > Aniceto,
> > introducing real Node and Relationship links as fields on Nodes and
> > relationships would essentially blur the distinction between Nodes,
> > Properties and Relationships, and let you treat the graph as a
> > Hypergraph. We find that model too abstract and hard to deal with the
> > edge cases of these structures in real world scenarios.
> >
> > Instead, would it be possible for you to store NodeIDs in properties
> > instead, or serialise Node[] into byte arrays as properties? I don't
> > recommend it since it duplicates and unlinks information in the graph
> > that has to be maintained by triggers and updates, but that would be
> > one possibility. What is the concrete usecase that drives you to these
> > constructs?
> >
> > Cheers,
> >
> > /peter neubauer
>
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