I am trying to sequentially insert vertices and edges in neo4j using python. The existing nodes aren't recognised as such when I add edges. Whether I use py2neo or bulbs I got a similar error message.
Note I am working with: linux64 python2.7 bulbs0.3 py2neo1.5 neo4j-community1.8.2
With bulbs:
>>> from bulbs.neo4jserver import Graph
>>> g = Graph()
>>> g.vertices.create(name="James")
>>> g.vertices.create(name="Julie")
>>> g.edges.create(james, "knows", julie)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-46-9ba24256218d> in <module>()
----> 1 g.edges.create(james, "knows", julie)
NameError: name 'james' is not defined
With py2neo
from py2neo import neo4j
graph=neo4j.GraphDatabaseService()
node=graph.create({"name":'James'},{'name':'Julie'})
rel=graph.create((james,"knows",julie))
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-8-591f826cfd05> in <module>()
2 graph=neo4j.GraphDatabaseService()
3 node=graph.create({"name":'James'},{'name':'Julie'})
----> 4 rel=graph.create((james,"knows",julie))
NameError: name 'james' is not defined
Moreover I got the same error with bulbs if I use rexster instead of neo4j, i.e.
>>> from bulbs.rexster import Graph
>>> g = Graph()
>>> g.vertices.create(name="James")
>>> g.vertices.create(name="Julie")
>>> g.edges.create(james, "knows", julie)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-6-2cfb5faa42d1> in <module>()
3 g.vertices.create(name="James")
4 g.vertices.create(name="Julie")
----> 5 g.edges.create((james, "knows", julie))
NameError: name 'james' is not defined
What's wrong here?
Thanks
Your application variables james and julie won't automatically be created simply by creating nodes with a similar name property. You haven't shared any of your py2neo code and I'm not familiar with bulbs but within py2neo you will need to do something like:
from py2neo import neo4j
graph_db = neo4j.GraphDatabaseService()
james, julie = graph_db.create(node(name="James"), node(name="Julie"))
graph_db.create(rel(james, "KNOWS", julie))
You could of course instead create both nodes and relationship in the same statement (and batch) if you preferred:
from py2neo import neo4j
graph_db = neo4j.GraphDatabaseService()
james, julie, friendship = graph_db.create(
node(name="James"), node(name="Julie"), rel(0, "KNOWS", 1)
)