py2neo.neo4j.GraphDatabaseService.node(id) raise ClientError(e)

Question

I think this might be an obvious to the seasoned py2neo users, but I could not get over it since I'm new. I'm trying to follow py2neo online doc: http://book.py2neo.org/en/latest/graphs_nodes_relationships/, but I was able to use the 'Node' methods for the instance returned from GraphDatabaseService.create, but when I use GraphDatabaseService.node to retrieve the node, all the expected Node methods stop working, I've narrowed it down to an example below using the Node.len method.

Thanks in advance for any helpful insights.

Bruce

My env: windows 7 professional pycharm 3.4 py2neo 1.6.4 python2.7.5

Here are the codes:

from py2neo import node, neo4j

db = neo4j.GraphDatabaseService()
db.clear()
a, = db.create(node({'name': ['a']}))
a.add_labels('Label')
b = db.node(a._id)
print db.neo4j_version
print b, type(b)
print "There is %s node in db" % db.order
print len(b)

Here are the outputs:

C:\Python27\python.exe C:/Users/you_zhang/PycharmProjects/py2neo/ex11.py
(2, 0, 3, u'')
(10) <class 'py2neo.neo4j.Node'>
There is 1 node in db
Traceback (most recent call last):
  File "C:/Users/you_zhang/PycharmProjects/py2neo/ex11.py", line 11, in <module>
    print len(b)
  File "C:\Users\you_zhang\AppData\Roaming\Python\Python27\site-packages\py2neo\neo4j.py", line 1339, in __len__
    return len(self.get_properties())
  File "C:\Users\you_zhang\AppData\Roaming\Python\Python27\site-packages\py2neo\neo4j.py", line 1398, in get_properties
    self._properties = assembled(self._properties_resource._get()) or {}
  File "C:\Users\you_zhang\AppData\Roaming\Python\Python27\site-packages\py2neo\neo4j.py", line 1349, in _properties_resource
    return self._subresource("properties")
  File "C:\Users\you_zhang\AppData\Roaming\Python\Python27\site-packages\py2neo\neo4j.py", line 403, in _subresource
    uri = URI(self.__metadata__[key])
  File "C:\Users\you_zhang\AppData\Roaming\Python\Python27\site-packages\py2neo\neo4j.py", line 338, in __metadata__
    self.refresh()
  File "C:\Users\you_zhang\AppData\Roaming\Python\Python27\site-packages\py2neo\neo4j.py", line 360, in refresh
    self._metadata = ResourceMetadata(self._get().content)
  File "C:\Users\you_zhang\AppData\Roaming\Python\Python27\site-packages\py2neo\neo4j.py", line 367, in _get
    raise ClientError(e)
py2neo.exceptions.ClientError: Not Found

score 0 · Answer 1 · answered Jun 23 '14 at 18:57

Your exact code snippet works for me (OS X, neo4j 2.1.2). There shouldn't be any problem. Have you tried to install the latest version of neo4j and run your code on a fresh and untouched database? I have encountered inconsistencies in corrupted databases.

Have you tried to load the node with .find()?

result = db.find('Label')
for n in result:
    print(n)

py2neo.neo4j.GraphDatabaseService.node(id) raise ClientError(e)

Here are the codes:

Here are the outputs:

1 Answers1