从任何给定的节点开始,我想运行遍历器,直到它到达类型为“contentpage”的节点(所有节点都有类型属性)。
我已经用以下遍历器尝试过
{
"order":"depth first",
"uniqueness" : "node global",
"relationships":[
{"type":"CONTAINS","direction":"in"},
{"type":"HAS","direction":"in"}
],
"prune evaluator":{"language":"javascript","body":"position.endNode().getProperty('type')!='contentpage';"},
"max depth":10000000
}
但我得到的只是 HTTP 错误 500。 有什么想法吗?
编辑:这是一个堆栈跟踪(我对它进行了一些修剪,因为它很大)
Problem accessing /db/data/node/782350/traverse/node. Reason:
javax.script.ScriptException: sun.org.mozilla.javascript.WrappedException: Wrapped org.neo4j.graphdb.NotFoundException: type property not found for NodeImpl#782348. (<Unknown Source>#1) in <Unknown Source> at line number 1
Caused by:
org.neo4j.server.rest.domain.EvaluationException: javax.script.ScriptException: sun.org.mozilla.javascript.WrappedException: Wrapped org.neo4j.graphdb.NotFoundException: type property not found for NodeImpl#782348. (<Unknown Source>#1) in <Unknown Source> at line number 1
at org.neo4j.server.rest.domain.EvaluatorFactory$CompiledScriptExecutor.eval(EvaluatorFactory.java:183)
at org.neo4j.server.rest.domain.EvaluatorFactory$ScriptedPruneEvaluator.pruneAfter(EvaluatorFactory.java:241)
at org.neo4j.kernel.impl.traversal.TraversalDescriptionImpl$WrappedPruneEvaluator.evaluate(TraversalDescriptionImpl.java:239)
at org.neo4j.kernel.impl.traversal.MultiEvaluator.evaluate(MultiEvaluator.java:41)
at org.neo4j.kernel.impl.traversal.TraversalBranchImpl.initialize(TraversalBranchImpl.java:93)
at org.neo4j.kernel.impl.traversal.TraversalBranchImpl.next(TraversalBranchImpl.java:112)
at org.neo4j.kernel.impl.traversal.StartNodeTraversalBranch.next(StartNodeTraversalBranch.java:50)
at org.neo4j.kernel.PreorderDepthFirstSelector.next(PreorderDepthFirstSelector.java:48)
at org.neo4j.kernel.impl.traversal.TraverserImpl$TraverserIterator.fetchNextOrNull(TraverserImpl.java:127)
at org.neo4j.kernel.impl.traversal.TraverserImpl$TraverserIterator.fetchNextOrNull(TraverserImpl.java:94)
at org.neo4j.helpers.collection.PrefetchingIterator.hasNext(PrefetchingIterator.java:55)
at org.neo4j.server.rest.web.DatabaseActions.traverse(DatabaseActions.java:922)
at org.neo4j.server.rest.web.RestfulGraphDatabase.traverse(RestfulGraphDatabase.java:641)
at sun.reflect.GeneratedMethodAccessor99.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
最佳答案
首先,看来你应该有
"uniqueness" : "node global"
通常,您不能发送空值。如果您想要默认值,请不要设置任何内容。请参阅此处了解更多信息:Neo4j REST API .
编辑更新的问题:
所以异常说:
NotFoundException: type property not found for NodeImpl
其原因是:
position.endNode().getProperty('type')
要避免这种情况,请为该属性设置默认值,例如:
getProperty('type','')
关于java - Neo4j Traverser - 只需获取特定类型的项目,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6408294/