I just came across the following when I try and link a node to itself:
java.lang.IllegalArgumentException: Start node equals end node
at org.neo4j.impl.core.RelationshipImpl.<init>(RelationshipImpl.java:57)
at
org.neo4j.impl.core.NodeManager.createRelationship(NodeManager.java:280)
at org.neo4j.impl.core.NodeImpl.createRelationshipTo(NodeImpl.java:308)
at
org.neo4j.impl.core.NodeProxy.createRelationshipTo(NodeProxy.java:177)
This is probably working as expected but why is this constraint necessary?
It is sometimes meaningful to create such relationships I think - e.g. I'm
trying to represent UML associations in a Neo graph. I suppose I can insert
an intermediate node into every relationship that represents an association,
turning a
subject_node -> relationship -> object_node
into a
subject_node -> subject_relationship -> node_representation_of_relationship
node_representation_of_relationship -> object_relationship -> object_node
to represent the case where subject_node = object_node
but I will have to do some special rendering to get it looking right.
Any insight into how critical this constraint is?
Rob.
_______________________________________________
Neo mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
