1

语境

我正在创建一个 api rest，它与已经由节点和边填充的图形数据库接口，该节点和边描述了事件和展览在几个以区域为特征的博物馆内的位置。特别是在展览和区域之间存在一些边缘，这些边缘具有开始时间和坐标等属性。开始时间是一个符合DateTime neo4j 格式的属性，下面是一个例子：

{
  "start": "2018-01-01T00:00:01.300Z",
  "coordinate": [
    0,
    0,
    0
  ]
}

我创建边缘的方式是：

CREATE (exhibit)-[:belongs_to {start:datetime('2018-01-01T00:00:01.300Z')}]->(zone)

其中展览和区域分别是节点 ID。

问题

我想从特定边缘检索 start 属性，但结果如下：

Unsupported property type: class java.time.ZonedDateTime

代码

findZone 函数产生问题：

<?php

    namespace App;

    use Vinelab\NeoEloquent\Eloquent\Model;
    use App\Http\Controllers\ZoneController;

    class Exhibit extends Model{
        protected $label = 'Exhibit';

        protected $fillable = [];

        protected $hidden = [];

        public function zones(){
            return $this->belongsToMany('App\Zone', 'belongs_to');
        }

        public static function findZone($exhibit){
            $edge = $exhibit->zones()->edge(ZoneController::showZoneByName("Parlatorio"));

            return $edge->start;
        }
    }

我试图只给边缘坐标属性，当我用坐标函数替换开始属性时。

堆栈跟踪

Headers: Array
(
    [Date] =>  Mon, 15 Oct 2018 21:28:14 GMT
    [Access-Control-Allow-Origin] =>  *
    [Content-Type] =>  application/json; charset=UTF-8; stream=true
    [Content-Length] =>  6379
)
Body: Array
(
    [message] => Unsupported property type: class java.time.ZonedDateTime
    [exception] => IllegalArgumentException
    [fullname] => java.lang.IllegalArgumentException
    [stackTrace] => Array
        (
            [0] => org.neo4j.server.helpers.PropertyTypeDispatcher.dispatchOtherProperty(PropertyTypeDispatcher.java:246)
            [1] => org.neo4j.server.helpers.PropertyTypeDispatcher.dispatch(PropertyTypeDispatcher.java:95)
            [2] => org.neo4j.server.helpers.PropertyTypeDispatcher.consumeProperties(PropertyTypeDispatcher.java:51)
            [3] => org.neo4j.server.rest.repr.PropertiesRepresentation.serialize(PropertiesRepresentation.java:51)
            [4] => org.neo4j.server.rest.repr.RelationshipRepresentation.extraData(RelationshipRepresentation.java:127)
            [5] => org.neo4j.server.rest.repr.ObjectRepresentation.serialize(ObjectRepresentation.java:147)
            [6] => org.neo4j.server.rest.repr.MappingRepresentation.serialize(MappingRepresentation.java:41)
            [7] => org.neo4j.server.rest.repr.OutputFormat.lambda$stream$0(OutputFormat.java:183)
            [8] => org.neo4j.server.rest.dbms.AuthorizationEnabledFilter.doFilter(AuthorizationEnabledFilter.java:123)
            [9] => org.neo4j.server.rest.web.CorsFilter.doFilter(CorsFilter.java:115)
            [10] => org.neo4j.server.rest.web.CollectUserAgentFilter.doFilter(CollectUserAgentFilter.java:69)
            [11] => java.base/java.lang.Thread.run(Unknown Source)
        )

    [errors] => Array
        (
            [0] => Array
                (
                    [code] => Neo.DatabaseError.General.UnknownError
                    [message] => Unsupported property type: class java.time.ZonedDateTime
                    [stackTrace] => java.lang.IllegalArgumentException: Unsupported property type: class java.time.ZonedDateTime
\tat org.neo4j.server.helpers.PropertyTypeDispatcher.dispatchOtherProperty(PropertyTypeDispatcher.java:246)
\tat org.neo4j.server.helpers.PropertyTypeDispatcher.dispatch(PropertyTypeDispatcher.java:95)
\tat org.neo4j.server.helpers.PropertyTypeDispatcher.consumeProperties(PropertyTypeDispatcher.java:51)
\tat org.neo4j.server.rest.repr.PropertiesRepresentation.serialize(PropertiesRepresentation.java:51)
\tat org.neo4j.server.rest.repr.RelationshipRepresentation.extraData(RelationshipRepresentation.java:127)
\tat org.neo4j.server.rest.repr.ObjectRepresentation.serialize(ObjectRepresentation.java:147)
\tat org.neo4j.server.rest.repr.MappingRepresentation.serialize(MappingRepresentation.java:41)
\tat org.neo4j.server.rest.repr.OutputFormat.lambda$stream$0(OutputFormat.java:183)
\tat com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:71)
\tat com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:57)
\tat com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:302)
\tat com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510)
\tat com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
\tat com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
\tat com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
\tat com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558)
\tat com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733)
\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
\tat org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865)
\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1655)
\tat org.neo4j.server.rest.dbms.AuthorizationEnabledFilter.doFilter(AuthorizationEnabledFilter.java:123)
\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
\tat org.neo4j.server.rest.web.CorsFilter.doFilter(CorsFilter.java:115)
\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
\tat org.neo4j.server.rest.web.CollectUserAgentFilter.doFilter(CollectUserAgentFilter.java:69)
\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
\tat org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
\tat org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
\tat org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
\tat org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
\tat org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)
\tat org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
\tat org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
\tat org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
\tat org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
\tat org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)
\tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
\tat org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:61)
\tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
\tat org.eclipse.jetty.server.Server.handle(Server.java:531)
\tat org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
\tat org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
\tat org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
\tat org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
\tat org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
\tat org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
\tat org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
\tat org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)
\tat org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)
\tat java.base/java.lang.Thread.run(Unknown Source)

                )

        )

)
at E:\\laravel-projects\\api_certose\\vendor\\heydavid713\
eo4jphp\\lib\\Everyman\\Neo4j\\Command.php:116)
[stacktrace]
#0 E:\\laravel-projects\\api_certose\\vendor\\heydavid713\
eo4jphp\\lib\\Everyman\\Neo4j\\Command\\GetRelationship.php(78): Everyman\\Neo4j\\Command->throwException('Unable to retri...', 500, Array, Array)
#1 E:\\laravel-projects\\api_certose\\vendor\\heydavid713\
eo4jphp\\lib\\Everyman\\Neo4j\\Command.php(69): Everyman\\Neo4j\\Command\\GetRelationship->handleResult(500, Array, Array)
#2 E:\\laravel-projects\\api_certose\\vendor\\heydavid713\
eo4jphp\\lib\\Everyman\\Neo4j\\Client.php(828): Everyman\\Neo4j\\Command->execute()
#3 E:\\laravel-projects\\api_certose\\vendor\\heydavid713\
eo4jphp\\lib\\Everyman\\Neo4j\\Client.php(544): Everyman\\Neo4j\\Client->runCommand(Object(Everyman\\Neo4j\\Command\\GetRelationship))
#4 E:\\laravel-projects\\api_certose\\vendor\\heydavid713\
eo4jphp\\lib\\Everyman\\Neo4j\\Relationship.php(102): Everyman\\Neo4j\\Client->loadRelationship(Object(Everyman\\Neo4j\\Relationship))
#5 E:\\laravel-projects\\api_certose\\vendor\\heydavid713\
eo4jphp\\lib\\Everyman\\Neo4j\\PropertyContainer.php(235): Everyman\\Neo4j\\Relationship->load()
#6 E:\\laravel-projects\\api_certose\\vendor\\heydavid713\
eo4jphp\\lib\\Everyman\\Neo4j\\Relationship.php(78): Everyman\\Neo4j\\PropertyContainer->loadProperties()
#7 E:\\laravel-projects\\api_certose\\vendor\\vinelab\
eoeloquent\\src\\Eloquent\\Edges\\Finder.php(144): Everyman\\Neo4j\\Relationship->getStartNode()
#8 E:\\laravel-projects\\api_certose\\vendor\\vinelab\
eoeloquent\\src\\Eloquent\\Edges\\Finder.php(171): Vinelab\\NeoEloquent\\Eloquent\\Edges\\Finder->directionFromRelation(Object(Everyman\\Neo4j\\Relationship), Object(App\\Exhibit), Object(App\\Zone))
#9 E:\\laravel-projects\\api_certose\\vendor\\vinelab\
eoeloquent\\src\\Eloquent\\Edges\\Finder.php(80): Vinelab\\NeoEloquent\\Eloquent\\Edges\\Finder->edgeFromRelationWithDirection(Object(Everyman\\Neo4j\\Relationship), Object(App\\Exhibit), Object(App\\Zone), 'any')
#10 E:\\laravel-projects\\api_certose\\vendor\\vinelab\
eoeloquent\\src\\Eloquent\\Relations\\BelongsToMany.php(158): Vinelab\\NeoEloquent\\Eloquent\\Edges\\Finder->first(Object(App\\Exhibit), Object(App\\Zone), 'belongs_to')
#11 E:\\laravel-projects\\api_certose\\app\\Exhibit.php(20): Vinelab\\NeoEloquent\\Eloquent\\Relations\\BelongsToMany->edge(Object(App\\Zone))
#12 E:\\laravel-projects\\api_certose\\app\\Http\\Controllers\\ExhibitController.php(44): App\\Exhibit::findZone(Object(App\\Exhibit))
#13 [internal function]: App\\Http\\Controllers\\ExhibitController->retrieveZone('187')
#14 E:\\laravel-projects\\api_certose\\vendor\\illuminate\\container\\BoundMethod.php(29): call_user_func_array(Array, Array)
#15 E:\\laravel-projects\\api_certose\\vendor\\illuminate\\container\\BoundMethod.php(87): Illuminate\\Container\\BoundMethod::Illuminate\\Container\\{closure}()
#16 E:\\laravel-projects\\api_certose\\vendor\\illuminate\\container\\BoundMethod.php(31): Illuminate\\Container\\BoundMethod::callBoundMethod(Object(Laravel\\Lumen\\Application), Array, Object(Closure))
#17 E:\\laravel-projects\\api_certose\\vendor\\illuminate\\container\\Container.php(564): Illuminate\\Container\\BoundMethod::call(Object(Laravel\\Lumen\\Application), Array, Array, NULL)
#18 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(373): Illuminate\\Container\\Container->call(Array, Array)
#19 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(339): Laravel\\Lumen\\Application->callControllerCallable(Array, Array)
#20 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(313): Laravel\\Lumen\\Application->callLumenController(Object(App\\Http\\Controllers\\ExhibitController), 'retrieveZone', Array)
#21 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(275): Laravel\\Lumen\\Application->callControllerAction(Array)
#22 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(260): Laravel\\Lumen\\Application->callActionOnArrayBasedRoute(Array)
#23 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(230): Laravel\\Lumen\\Application->handleFoundRoute(Array)
#24 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(164): Laravel\\Lumen\\Application->handleDispatcherResponse(Array)
#25 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(413): Laravel\\Lumen\\Application->Laravel\\Lumen\\Concerns\\{closure}()
#26 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(166): Laravel\\Lumen\\Application->sendThroughPipeline(Array, Object(Closure))
#27 E:\\laravel-projects\\api_certose\\vendor\\laravel\\lumen-framework\\src\\Concerns\\RoutesRequests.php(107): Laravel\\Lumen\\Application->dispatch(NULL)
#28 E:\\laravel-projects\\api_certose\\public\\index.php(28): Laravel\\Lumen\\Application->run()
#29 {main}
"}
4

2 回答 2

1

我也遇到了这个问题，并且无法以您想要的方式解决这个问题。据我所知，它在新雄辩图书馆本身。但是，我想出了一个不理想的替代方案，因为最好能够使用库来完成它，但它可以工作。

我写了一个RawQueryService可以接受原始Neo4j查询并将输出作为关联数组检索的方法。

RawQueryService如下：

<?php

namespace App\Services;

use Illuminate\Support\Facades\DB;

class RawQueryService
{

    public static function executeRawQuery(string $query, $noProcessing=false) {
        $result = DB::select($query);

        $resultArray = array();
        foreach($result as $row){
            $result = $row['n'];
            array_push($resultArray, $result);
        }

        return $resultArray;
    }


}

然后检索开始时间：

$start = \App\Services\RawQueryService::executeRawQuery(
         "match(n) where n.title=\"".$title."\" return toString(n.start)");

它在内部将日期时间转换为字符串，因此 Neo4j 库不会收到IllegalArgumentException.

我希望这可以帮助你。

于 2018-10-16T07:02:16.473 回答
0

我一直在努力解决这个问题，发现datetime在服务器 REST API 中序列化属性存在问题。根据 http vs bolt 和查询类型，会产生一些不同的错误，但是当datetime从响应中删除属性时它们会消失。

服务器的 v3.5.0 为 HTTP 请求修复了它。我还没有验证这个版本的螺栓。

我的调查和解决方案的更多细节位于https://github.com/neo4jrb/neo4j/issues/1522（ruby gem 客户端）。该问题在 v3.4.1 和 3.4.6 中都存在。

于 2019-01-23T14:51:17.383 回答