Re: Django and Neo4J - installation issue

[Matt Luongo]

Have you tried importing `Person` from your models module? Eg `from my_project.my_app.models import Person`.

The docs were written expecting people to be familiar with the Python path and Django project layout, and glosses over non-neo4django-specific imports- I'm planning a more comprehensive tutorial / example app soon that I hope will address those needs. Until then, I'd appreciate any suggestions to make the language / examples in the docs more clear.

On Friday, June 7, 2013 2:26:23 PM UTC-4, Nimrod M wrote:

 

Hello, 

I installed neo4django and followed the tutorial 

https://neo4django.readthedocs.org/en/latest/writing-models.html

but after I created the models I cannot create the models objects.

What could be the reason?

models.py

# from django.db import models

from neo4django.db import models

class Person(models.NodeModel):

    name = models.StringProperty()

    age = models.IntegerProperty()

    friends = models.Relationship('self',rel_type='friends_with')

class OnlinePerson(Person):

email = models.EmailProperty()

homepage = models.URLProperty()

class EmployedPerson(Person):

    job_title = models.StringProperty(indexed=True)

settings.py

DATABASES = {

    'default': {

        'ENGINE': 'django.db.backends.sqlite3',

        # 'NAME': os.path.join(BASE_DIR, 'db', 'test_database.sqlite3')

    }

}

NEO4J_DATABASES = {

    'default' : {

        'HOST':'localhost',

        'PORT':7474,

        'ENDPOINT':'/db/data'

    }

}

DATABASE_ROUTERS = ['neo4django.utils.Neo4djangoIntegrationRouter']

-------------------

Shell

Nimrod:neo elianamordekovich$ python neo/manage.py shell

Python 2.7.2 (default, Jun 20 2012, 16:23:33) 

[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

(InteractiveConsole)

>>> pete = Person.objects.create(name='Pete', age=30)

Traceback (most recent call last):

  File "<console>", line 1, in <module>

NameError: name 'Person' is not defined

>>> 

Thanks in advance!

Nimrod

[Nimrod M]

Yes, I did it.

Anyway, now I have an another problem.

I didn't find any similar issue on my searches.

Do you know how to help?

>>> from person.models import *

>>> pete = Person.objects.create(name='Pete', age=30)

Traceback (most recent call last):

  File "<console>", line 1, in <module>

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/neo4django/db/models/manager.py", line 42, in create

    return self.get_query_set().create(**kwargs)

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/neo4django/db/models/query.py", line 1052, in create

    return super(NodeQuerySet, self).create(**kwargs)

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/django/db/models/query.py", line 377, in create

    obj.save(force_insert=True, using=self.db)

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/neo4django/db/models/base.py", line 325, in save

    return super(NodeModel, self).save(using=using, **kwargs)

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/django/db/models/base.py", line 463, in save

    self.save_base(using=using, force_insert=force_insert, force_update=force_update)

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/neo4django/db/models/base.py", line 341, in save_base

    self._save_neo4j_node(using)

  File "<string>", line 2, in _save_neo4j_node

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/neo4django/db/models/base.py", line 115, in trans_method

    ret = func(*args, **kw)

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/neo4django/db/models/base.py", line 371, in _save_neo4j_node

    typesToIndex=type_names_to_index)

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/neo4django/neo4jclient.py", line 178, in gremlin_tx

    return self.gremlin(script, tx=True, **params)

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/neo4django/neo4jclient.py", line 126, in gremlin

    ext = self.extensions.GremlinPlugin

  File "/Users/ee/Development/projects/mycoolproject/lib/python2.7/site-packages/neo4jrestclient/client.py", line 2086, in __getattr__

    self._dict[attr] = ExtensionModule(self._extensions[attr], self._auth)

KeyError: 'GremlinPlugin'

Thanks!

בתאריך יום שבת, 8 ביוני 2013 01:34:34 UTC+3, מאת Matt Luongo:

[Matt Luongo]

What version of Neo4j are you using? Neo4django master supports 1.8.2 and 1.9, while the release on PyPi only supports up to 1.8.2. It looks like you're missing the GremlinPlugin, which was removed by default after Neo4j 1.9, and is currently a neo4django requirement.

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[Nimrod M]

Thank you for your comment.

I'm using in community-1.9-unix version.

I installed it by the commands:

brew update
brew install neo4j
neo4j start

Do you have any idea?

I really will appreciate your help.

בתאריך יום ראשון, 9 ביוני 2013 17:41:34 UTC+3, מאת Matt Luongo:

[Nimrod M]

I managed to solve it.

Just killed a locked process and then restarted the neo4j server.

Thank you.

בתאריך יום ראשון, 9 ביוני 2013 23:44:36 UTC+3, מאת Nimrod M:

[Matt Luongo]

Could you run `curl -XGET 'http://localhost:7474/db/data/' while the database is running and share the result?

[Nimrod M]

I got it:

(mycoolproject)Nimrod:neo_test ee$ curl -XGET 'http://localhost:7474/db/data/'

{

  "extensions" : {

    "CypherPlugin" : {

      "execute_query" : "http://localhost:7474/db/data/ext/CypherPlugin/graphdb/execute_query"

    },

    "GremlinPlugin" : {

      "execute_script" : "http://localhost:7474/db/data/ext/GremlinPlugin/graphdb/execute_script"

    }

  },

  "node" : "http://localhost:7474/db/data/node",

  "reference_node" : "http://localhost:7474/db/data/node/0",

  "node_index" : "http://localhost:7474/db/data/index/node",

  "relationship_index" : "http://localhost:7474/db/data/index/relationship",

  "extensions_info" : "http://localhost:7474/db/data/ext",

  "relationship_types" : "http://localhost:7474/db/data/relationship/types",

  "batch" : "http://localhost:7474/db/data/batch",

  "cypher" : "http://localhost:7474/db/data/cypher",

  "neo4j_version" : "1.9"

Is it fine?

I have an another issue now...

I cannot open the url http://localhost:7474.

I think it's because of the virtualenv.

What should I do in order to view the neo4j pages?

בתאריך יום שני, 10 ביוני 2013 00:01:13 UTC+3, מאת Matt Luongo:

[Matt Luongo]

The virtualenv is just for Python packages- it shouldn't affect browsing the Neo4j interface. If you can curl the port, you *should* be able to visit it with a browser.

Anyone have any ideas?

[Nimrod M]

Once I'm running neo4j start

I get the message:

WARNING! You are using an unsupported version of the Java runtime. Please use Oracle(R) Java(TM) Runtime Environment 7.

Starting Neo4j Server...WARNING: not changing user

process [83944]... waiting for server to be ready...... OK.

Go to http://localhost:7474/webadmin/ for administration interface.

and it's although I updated it to JDK7..

Perhaps I need change something in my paths?

I use OSX.

The link still is not working

Any advices?

בתאריך יום שני, 10 ביוני 2013 00:24:12 UTC+3, מאת Matt Luongo:

[Dela Lange]

I got the same problem on my Raspberry Pi.

First check your java version with

java -version

is it 1.7 ? 

If not, then update.

If yes, is it openjdk7 or oracle jdk?

On my raspberry it din't run with oracle, but with opendjk, so maybe u try this.

[Michael Hunger]

What does 

java -version

and

/usr/libexec/java_home -v 1.7

report ?

Michael

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