我在bulbs和Rexster使用python OrientDB。我正在尝试创建一个边缘，但是我收到了这个错误：
>> g.edges.create(g.V[0], "aoeu", g.V[1])
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "/usr/local/lib/python2.7/dist-packages/bulbs/element.py", line 879, in create
resp = self.client.create_edge(outV, label, inV, data, keys=_keys)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 454, in create_edge
return self.create_indexed_edge(outV,label,inV,data,index_name,keys=keys)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 990, in create_indexed_edge
resp = self.gremlin(script,params)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 356, in gremlin
return self.request.post(gremlin_path, params)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rest.py", line 131, in post
return self.request(POST, path, params)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rest.py", line 186, in request
return self.response_class(http_resp, self.config)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 198, in __init__
self.handle_response(response)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 222, in handle_response
response_handler(http_resp)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rest.py", line 50, in server_error
raise SystemError(http_resp)
SystemError: ({'status': '500', 'transfer-encoding': 'chunked', 'server': 'grizzly/2.2.16', 'connection': 'close', 'date': 'Fri, 24 Jan 2014 19:49:10 GMT', 'access-control-allow-origin': '*', 'content-type':
'application/json'}, '{"message":"","error":"javax.script.ScriptException: java.lang.ClassCastException: com.orientechnologies.orient.core.id.ORecordId cannot be cast to com.orientechnologies.orient.core.re
cord.ORecord","api":{"description":"evaluate an ad-hoc Gremlin script for a graph.","parameters":{"rexster.returnKeys":"an array of element property keys to return (default is to return all element propertie
s)","rexster.showTypes":"displays the properties of the elements with their native data type (default is false)","load":"a list of \'stored procedures\' to execute prior to the \'script\' (if \'script\' is n
ot specified then the last script in this argument will return the values","rexster.offset.end":"end index for a paged set of data to be returned","rexster.offset.start":"start index for a paged set of data
to be returned","params":"a map of parameters to bind to the script engine","language":"the gremlin language flavor to use (default to groovy)","script":"the Gremlin script to be evaluated"}},"success":false
}')
有趣的是，当我再次执行命令时，它可以工作，但是我创建了2条边，这是错误的。
在我的Rexster服务器上
我收到此错误
....
at Script5.run(Script5.groovy:23)
at com.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:219)
... 58 more
[WARN] GraphResource - The [tp:gremlin+*] extension raised an error response.
我的图表配置
<graph>
<graph-enabled>true</graph-enabled>
<graph-name>orientdb</graph-name>
<graph-type>orientgraph</graph-type>
<graph-location>local:/tmp/orientdb</graph-location>
<properties>
<username>admin</username>
<password>admin</password>
</properties>
<extensions>
<allows>
<allow>tp:gremlin</allow>
</allows>
</extensions>
</graph>
我一直在犯的错误是什么，我该如何解决？
添加了DEBUG信息：
>>> from bulbs.rexster import DEBUG
>>> g.config.set_logger(DEBUG)
>>> g.edges.create(g.V[0], "a", g.V[1])
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST body: {"params": null, "script": "g.getVertices()"}
POST body: {"params": null, "script": "g.getVertices()"}
POST body: {"params": null, "script": "g.getVertices()"}
POST body: {"params": null, "script": "g.getVertices()"}
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST body: {"params": null, "script": "g.getVertices()"}
POST body: {"params": null, "script": "g.getVertices()"}
POST body: {"params": null, "script": "g.getVertices()"}
POST body: {"params": null, "script": "g.getVertices()"}
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST url: http://localhost:8182/graphs/orientdb/tp/gremlin
POST body: {"params": {"label_var": "label", "outV": "#9:0", "keys": null, "data": {}, "inV": "#9:1", "index_name": "edge", "label": "a"}, "script": "def createIndexedEdge = {\n index = g.idx(index_name)\n edge = g.addEdge(g.v(outV),g.v(inV),label)\n for (entry in data.entrySet()) {\n if (entry.value == null) continue;\n edge.setProperty(entry.key,entry.value)\n if (keys == null || keys.contains(entry.key))\n\tindex.put(entry.key,String.valueOf(entry.value),edge)\n }\n index.put(label_var,String.valueOf(label),edge)\n return edge\n }\n def transaction = { final Closure closure ->\n try {\n results = closure();\n g.commit();\n return results; \n } catch (e) {\n g.rollback();\n throw e;\n }\n }\n return transaction(createIndexedEdge);"}
POST body: {"params": {"label_var": "label", "outV": "#9:0", "keys": null, "data": {}, "inV": "#9:1", "index_name": "edge", "label": "a"}, "script": "def createIndexedEdge = {\n index = g.idx(index_name)\n edge = g.addEdge(g.v(outV),g.v(inV),label)\n for (entry in data.entrySet()) {\n if (entry.value == null) continue;\n edge.setProperty(entry.key,entry.value)\n if (keys == null || keys.contains(entry.key))\n\tindex.put(entry.key,String.valueOf(entry.value),edge)\n }\n index.put(label_var,String.valueOf(label),edge)\n return edge\n }\n def transaction = { final Closure closure ->\n try {\n results = closure();\n g.commit();\n return results; \n } catch (e) {\n g.rollback();\n throw e;\n }\n }\n return transaction(createIndexedEdge);"}
POST body: {"params": {"label_var": "label", "outV": "#9:0", "keys": null, "data": {}, "inV": "#9:1", "index_name": "edge", "label": "a"}, "script": "def createIndexedEdge = {\n index = g.idx(index_name)\n edge = g.addEdge(g.v(outV),g.v(inV),label)\n for (entry in data.entrySet()) {\n if (entry.value == null) continue;\n edge.setProperty(entry.key,entry.value)\n if (keys == null || keys.contains(entry.key))\n\tindex.put(entry.key,String.valueOf(entry.value),edge)\n }\n index.put(label_var,String.valueOf(label),edge)\n return edge\n }\n def transaction = { final Closure closure ->\n try {\n results = closure();\n g.commit();\n return results; \n } catch (e) {\n g.rollback();\n throw e;\n }\n }\n return transaction(createIndexedEdge);"}
POST body: {"params": {"label_var": "label", "outV": "#9:0", "keys": null, "data": {}, "inV": "#9:1", "index_name": "edge", "label": "a"}, "script": "def createIndexedEdge = {\n index = g.idx(index_name)\n edge = g.addEdge(g.v(outV),g.v(inV),label)\n for (entry in data.entrySet()) {\n if (entry.value == null) continue;\n edge.setProperty(entry.key,entry.value)\n if (keys == null || keys.contains(entry.key))\n\tindex.put(entry.key,String.valueOf(entry.value),edge)\n }\n index.put(label_var,String.valueOf(label),edge)\n return edge\n }\n def transaction = { final Closure closure ->\n try {\n results = closure();\n g.commit();\n return results; \n } catch (e) {\n g.rollback();\n throw e;\n }\n }\n return transaction(createIndexedEdge);"}
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "/usr/local/lib/python2.7/dist-packages/bulbs/element.py", line 879, in create
resp = self.client.create_edge(outV, label, inV, data, keys=_keys)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 454, in create_edge
return self.create_indexed_edge(outV,label,inV,data,index_name,keys=keys)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 990, in create_indexed_edge
resp = self.gremlin(script,params)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 356, in gremlin
return self.request.post(gremlin_path, params)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rest.py", line 131, in post
return self.request(POST, path, params)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rest.py", line 186, in request
return self.response_class(http_resp, self.config)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 198, in __init__
self.handle_response(response)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rexster/client.py", line 222, in handle_response
response_handler(http_resp)
File "/usr/local/lib/python2.7/dist-packages/bulbs/rest.py", line 50, in server_error
raise SystemError(http_resp)
SystemError: ({'status': '500', 'transfer-encoding': 'chunked', 'server': 'grizzly/2.2.16', 'connection': 'close', 'date': 'Mon, 27 Jan 2014 18:33:00 GMT', 'access-control-allow-origin': '*', 'content-type': 'application/json'}, '{"message":"","error":"javax.script.ScriptException: java.lang.ClassCastException: com.orientechnologies.orient.core.id.ORecordId cannot be cast to com.orientechnologies.orient.core.record.ORecord","api":{"description":"evaluate an ad-hoc Gremlin script for a graph.","parameters":{"rexster.returnKeys":"an array of element property keys to return (default is to return all element properties)","rexster.showTypes":"displays the properties of the elements with their native data type (default is false)","load":"a list of \'stored procedures\' to execute prior to the \'script\' (if \'script\' is not specified then the last script in this argument will return the values","rexster.offset.end":"end index for a paged set of data to be returned","rexster.offset.start":"start index for a paged set of data to be returned","params":"a map of parameters to bind to the script engine","language":"the gremlin language flavor to use (default to groovy)","script":"the Gremlin script to be evaluated"}},"success":false}')
答案 0 :(得分：0)
如果你在灯泡中打开调试，你可以看到Bulbs发送给Rexster的命令和参数：
>>> from bulbs.rexster import Graph, DEBUG
>>> g = Graph()
>>> g.config.set_logger(DEBUG)
>>> g.edges.create(g.V[0], "aoeu", g.V[1])
此处g.edges.create() ...
https://github.com/espeed/bulbs/blob/master/bulbs/element.py#L854
def create(self, outV, label, inV, _data=None, _keys=None, **kwds):
"""
Creates an edge in the database and returns it.
:param outV: The outgoing vertex.
:type outV: Vertex or int
:param label: The edge's label.
:type label: str
:param inV: The incoming vertex.
:type inV: Vertex or int
:param _data: Optional property data dict.
:type _data: dict
:param kwds: Optional property data keyword pairs.
:type kwds: dict
:rtype: Edge
"""
assert label is not None
data = build_data(_data, kwds)
outV, inV = coerce_vertices(outV, inV)
resp = self.client.create_edge(outV, label, inV, data, keys=_keys)
return initialize_element(self.client, resp.results)
...正在调用低级client.create_edge()方法......
https://github.com/espeed/bulbs/blob/master/bulbs/rexster/client.py#L433
# Edge Proxy
def create_edge(self, outV, label, inV, data={}, keys=None):
"""
Creates a edge and returns the Response.
:param outV: Outgoing vertex ID.
:type outV: int
:param label: Edge label.
:type label: str
:param inV: Incoming vertex ID.
:type inV: int
:param data: Property data.
:type data: dict or None
:rtype: RexsterResponse
"""
if keys or self.config.autoindex is True:
index_name = self.config.edge_index
return self.create_indexed_edge(outV,label,inV,data,index_name,keys=keys)
data = self._remove_null_values(data)
edge_data = dict(_outV=outV,_label=label,_inV=inV)
data.update(edge_data)
return self.request.post(edge_path, data)
...如果您将config.autoindex设置为True（这是默认设置），那么它最终会调用client.create_indexed_edge() ...
https://github.com/espeed/bulbs/blob/master/bulbs/rexster/client.py#L960
def create_indexed_edge(self, outV, label, inV, data, index_name, keys=None):
"""
Creates a edge, indexes it, and returns the Response.
:param outV: Outgoing vertex ID.
:type outV: int
:param label: Edge label.
:type label: str
:param inV: Incoming vertex ID.
:type inV: int
:param data: Property data.
:type data: dict
:param index_name: Name of the index.
:type index_name: str
:param keys: Property keys to index. Defaults to None (indexes all properties).
:type keys: list
:rtype: RexsterResponse
"""
data = self._remove_null_values(data)
edge_params = dict(outV=outV,label=label,inV=inV,label_var=self.config.label_var)
params = dict(data=data,index_name=index_name,keys=keys)
params.update(edge_params)
script = self.scripts.get("create_indexed_edge")
resp = self.gremlin(script,params)
resp.results = resp.one()
return resp
...注意client.create_indexed_edge() Python方法将create_indexed_edge() Gremlin脚本的 body 发送给Rexster ......
https://github.com/espeed/bulbs/blob/master/bulbs/rexster/gremlin.groovy#L75
// from Bulbs/Rexster gremlin.groovy
def create_indexed_edge(outV,label,inV,data,index_name,keys,label_var) {
def createIndexedEdge = {
index = g.idx(index_name)
edge = g.addEdge(g.v(outV),g.v(inV),label)
for (entry in data.entrySet()) {
if (entry.value == null) continue;
edge.setProperty(entry.key,entry.value)
if (keys == null || keys.contains(entry.key))
index.put(entry.key,String.valueOf(entry.value),edge)
}
index.put(label_var,String.valueOf(label),edge)
return edge
}
def transaction = { final Closure closure ->
try {
results = closure();
g.commit();
return results;
} catch (e) {
g.rollback();
throw e;
}
}
return transaction(createIndexedEdge);
}
答案 1 :(得分：0)
在OrientDB 1.7中已修复，有关详细信息，请参阅https://github.com/tinkerpop/rexster/issues/341。