java - Spring-data-neo4j は複数のパスを取得します

Question

現在、2 つのノード間のパスを取得するために spring-data-neo4j を使用しています。リポジトリは次のとおりです。

@Query("MATCH p=((n:GLNode)-[:GLRelationship*0..]->(m:GLNode)) WHERE id(n)={0} and id(m)={1} RETURN nodes(p)")
Collection<GLNode> getAllPathes(Long sid, Long eid);

ただし、例外は、1行のみが期待されているが2つ見つかったということです。

詳細については、コードを次のように変更した場合:

@Query("MATCH p=((n:GLNode)-[:GLRelationship*0..]->(m:GLNode)) WHERE id(n)={0} and id(m)={1} RETURN nodes(p)")
Collection<Collection<GLNode>> getAllPathes(Long sid, Long eid);

domain に正しくマッピングされていない応答を取得できますGLNode。たとえば、idnode が欠落しています。

最短経路のみを見つけた場合、たとえば、

@Query("MATCH p=shortestPath((n:GLNode)-[:GLRelationship*0..]->(m:GLNode)) WHERE id(n)={0} and id(m)={1} RETURN nodes(p)")
Collection<GLNode> getAllPathes(Long sid, Long eid);

その後、すべてが正常に機能します。

では、neo4j からクエリされた複数のパスを Java の単一のオブジェクトにマップする正しい方法は何ですか?

ありがとう。

=============== 更新 ==============

ノードのIDを取得するだけで一時的な解決策を思いつきました。つまり、

@Query("MATCH p=((n:GLNode)-[:GLRelationship*0..]->(m:GLNode)) WHERE id(n)={0} AND id(m)={1} RETURN [node in nodes(p) | id(node)] AS nodes, [rel in relationships(p) | id(rel)] AS  rels")
Collection<HashMap> getAllPathes(Long sid, Long eid);

クライアントがすべてのグラフを知っている場合にのみ機能します。

===================== 更新 2 ======================

1 行のみが予期されますが、実際には次のコードで 2 つの例外がスローされます。

@Query("MATCH p=((n:GLNode)-[:GLRelationship*0..]->(m:GLNode)) WHERE id(n)={0} AND id(m)={1} RETURN nodes(p)")
HashMap getAllPathes(Long sid, Long eid);

例外の詳細は次のとおりです。

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.RuntimeException: Result not of expected size. Expected 1 row but found 15
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    com.hersbitcloud.cancercloud.CORSFilter.doFilter(CORSFilter.java:24)
    org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:87)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
root cause

java.lang.RuntimeException: Result not of expected size. Expected 1 row but found 15
    org.neo4j.ogm.session.delegates.ExecuteQueriesDelegate.queryForObject(ExecuteQueriesDelegate.java:65)
    org.neo4j.ogm.session.Neo4jSession.queryForObject(Neo4jSession.java:308)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:497)
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
    org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
    com.sun.proxy.$Proxy51.queryForObject(Unknown Source)
    org.springframework.data.neo4j.repository.query.GraphRepositoryQuery.execute(GraphRepositoryQuery.java:78)
    org.springframework.data.neo4j.repository.query.GraphRepositoryQuery.execute(GraphRepositoryQuery.java:52)
    org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:482)
    org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:460)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:208)
    com.sun.proxy.$Proxy62.getAllPathes(Unknown Source)
    com.hersbitcloud.cancercloud.services.GLService.getAllPathes(GLService.java:77)
    com.hersbitcloud.cancercloud.controllers.GLController.getAllPathes(GLController.java:64)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:497)
    org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    com.hersbitcloud.cancercloud.CORSFilter.doFilter(CORSFilter.java:24)
    org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:87)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)