python - 如何添加 g :Vertex GraphSON in Python Gremlin?

Question

我把 example vertex GraphSON文件中的 g:Vertex:

$ cat vertex.json 
{ "@type" : "g:Vertex", "@value" : { "id" : { "@type" : "g:Int32", "@value" : 1 }, "label" : "person", "properties" : { "name" : [ { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 0 }, "value" : "marko", "label" : "name" } } ], "location" : [ { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 6 }, "value" : "san diego", "label" : "location", "properties" : { "startTime" : { "@type" : "g:Int32", "@value" : 1997 }, "endTime" : { "@type" : "g:Int32", "@value" : 2001 } } } }, { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 7 }, "value" : "santa cruz", "label" : "location", "properties" : { "startTime" : { "@type" : "g:Int32", "@value" : 2001 }, "endTime" : { "@type" : "g:Int32", "@value" : 2004 } } } }, { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 8 }, "value" : "brussels", "label" : "location", "properties" : { "startTime" : { "@type" : "g:Int32", "@value" : 2004 }, "endTime" : { "@type" : "g:Int32", "@value" : 2005 } } } }, { "@type" : "g:VertexProperty", "@value" : { "id" : { "@type" : "g:Int64", "@value" : 9 }, "value" : "santa fe", "label" : "location", "properties" : { "startTime" : { "@type" : "g:Int32", "@value" : 2005 } } } } ] } } }

尝试将其读入 Python Gremlin 服务器:

from gremlin_python.process.anonymous_traversal import traversal 
from gremlin_python.driver.driver_remote_connection import DriverRemoteConnection 

g = traversal().withRemote(DriverRemoteConnection('ws://localhost:8182/gremlin','g')) 
g.io("/home/ubuntu/vertex.json").read().iterate()                                                                                                                                                                       

产生错误:

GremlinServerError: 500: org.apache.tinkerpop.shaded.jackson.databind.JsonMappingException: Could not deserialize the JSON value as required. Nested exception: java.lang.InstantiationException: Cannot deserialize the value with the detected type contained in the JSON ('g:Vertex') to the type specified in parameter to the object mapper (interface java.util.Map). Those types are incompatible. at [Source: (ByteArrayInputStream); line: 1, column: 36]

我试过弄乱 DriverRemoteConnection 的 graphson_reader 和 message_serializer 参数来指定 GraphSONSerializersV3d0 但我可以'克服那个错误。

如何将上面的示例顶点 GraphSON 从 Python 的 Gremlin 服务器读入图形？

Answer 1

您是如何创建 GraphSON 的？可能值得使用 TinkerGraph 创建一个简单的 GraphSON 文件并将您的文件与该文件进行比较以确保语法正确。我使用以下步骤创建了如下所示的 JSON。您示例中的 GraphSON 看起来更像是查询结果，而不是描述图形的文件。无论如何，这是一个例子:

gremlin> g.addV('test').property('name','some-name').property('age','some-age')
==>v[61015]
gremlin> g.io('test.json').write()   

{"id":{"@type":"g:Int64","@value":61015},"label":"test","properties":{"name":[{"id":{"@type":"g:Int64","@value":61016},"value":"some-name"}],"age":[{"id":{"@type":"g:Int64","@value":61017},"value":"some-age"}]}}

这是指向 Apache TinkerPop GraphSON 引用文档的链接。

http://tinkerpop.apache.org/docs/3.4.6/dev/io/#graphson