nicolewhite / neo4j-flask Goto Github PK

Hi Nicole,

I am trying to do this:

port = gdb.labels.create(“Port”)

buenos_aires = gdb.nodes.create(name=”Buenos Aires”)
new_york = gdb.nodes.create(name=”New York”)
liverpool = gdb.nodes.create(name=”Liverpool”)
casablanca = gdb.nodes.create(name=”Casablana”)
cape_town = gdb.nodes.create(name=”Cape Town”)

port.add(buenos_aires, new_york, liverpool, casablanca, cape_town)

buenos_aires.relationships.create(“6 days”, new_york)
buenos_aires.relationships.create(“5 days”, casablanca)
buenos_aires.relationships.create(“4 days”, cape_town)

then how to do the query as each relationship is not the same as generic ‘LIKE’ but different number of days?

say needing to find out number of days from New York to Liverpool to Cape Town etc?

First thanks for the code and tutorial -- they are both very helpful.

Issue:

• When logged in as a user and looking at the profile page of another user, the system does not correctly display the number of likes or the common tags.

Potential Cause:

• the return call on the get_commonality_of_user method in models.py uses the following syntax:

return graph.run(query, they=other.username, you=self.username).next

Fix:
Modify the return call to be:
return graph.run(query, they=other.username, you=self.username).next()

or wrap it with:
return next(graph.run(query, they=other.username, you=self.username))

Environment:

• Python 3.6
• Windows 10

Problem
Console output

PS D:\Projects\neo4j-flask> python run.py
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\site-packages\werkzeug\serving.py", line 65, in <module>
    from SocketServer import ThreadingMixIn, ForkingMixIn
ModuleNotFoundError: No module named 'SocketServer'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "run.py", line 6, in <module>
    app.run(host='0.0.0.0', port=port)
  File "C:\ProgramData\Anaconda3\lib\site-packages\flask\app.py", line 828, in run
    from werkzeug.serving import run_simple
  File "C:\ProgramData\Anaconda3\lib\site-packages\werkzeug\serving.py", line 68, in <module>
    from socketserver import ThreadingMixIn, ForkingMixIn
ImportError: cannot import name 'ForkingMixIn'
PS D:\Projects\neo4j-flask> pip install -U werkzeug

What Worked for Me

As per: https://stackoverflow.com/a/39214538/2805700

This is fixed as of Werkzeug 0.11.15. Make sure you have installed the latest version of Werkzeug. pip install -U werkzeug.

So I ran pip install -U werkzeug

Updated requirements.txt should to Werkzeug>=0.14.10

hi ma'am,
could we create search page so that we can search by using 'user' or 'tag'?I need to search blog using username and tag. Elasticsearch is not possible so that I want to make search form.
Please, Try to share some code
Thank You,

i cloned the repo and used the same code. i got the neo4j server running on localhost/7474. But when i run the app i get a 505 error saying :Internal Server Error

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application. Please help me resolve it.

(venv) antonina@antonina-HP-Pavilion-g6-Notebook-PC:~/neo4j-flask$ python run.py
Traceback (most recent call last):
File "run.py", line 1, in
from blog import app
File "/home/antonina/neo4j-flask/blog/init.py", line 1, in
from .views import app
File "/home/antonina/neo4j-flask/blog/views.py", line 1, in
from .models import User, get_todays_recent_posts
File "/home/antonina/neo4j-flask/blog/models.py", line 2, in
from passlib.hash import bcrypt
ImportError: No module named passlib.hash

File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\database_init_.py", line 318, in new
inst = cls.__instances[key]
KeyError: (<class 'py2neo.database.Graph'>, <ServerAddress settings={'host': 'localhost', 'http_port': 7474}>, 'data')
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\packages\httpstream\http.py", line 322, in submit
response = send()
File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\packages\httpstream\http.py", line 317, in send
http.request(xstr(method), xstr(uri.absolute_path_reference), body, headers)
File "C:\Users\abc\AppData\Local\Programs\Python\Python36-32\lib\http\client.py", line 1239, in request
self._send_request(method, url, body, headers, encode_chunked)
File "C:\Users\abc\AppData\Local\Programs\Python\Python36-32\lib\http\client.py", line 1285, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "C:\Users\abc\AppData\Local\Programs\Python\Python36-32\lib\http\client.py", line 1234, in endheaders
self.send_output(message_body, encode_chunked=encode_chunked)
File "C:\Users\abc\AppData\Local\Programs\Python\Python36-32\lib\http\client.py", line 1026, in send_output
self.send(msg)
File "C:\Users\abc\AppData\Local\Programs\Python\Python36-32\lib\http\client.py", line 964, in send
self.connect()
File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\packages\httpstream\http.py", line 80, in connect
self.source_address)
File "C:\Users\abc\AppData\Local\Programs\Python\Python36-32\lib\socket.py", line 724, in create_connection
raise err
File "C:\Users\abc\AppData\Local\Programs\Python\Python36-32\lib\socket.py", line 713, in create_connection
sock.connect(sa)
ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Program Files\JetBrains\PyCharm 2018.1.2\helpers\pydev\pydevd.py", line 1664, in
main()
File "C:\Program Files\JetBrains\PyCharm 2018.1.2\helpers\pydev\pydevd.py", line 1658, in main
globals = debugger.run(setup['file'], None, None, is_module)
File "C:\Program Files\JetBrains\PyCharm 2018.1.2\helpers\pydev\pydevd.py", line 1068, in run
pydev_imports.execfile(file, globals, locals) # execute the script
File "C:\Program Files\JetBrains\PyCharm 2018.1.2\helpers\pydev_pydev_imps_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"\n", file, 'exec'), glob, loc)
File "C:/Users/abc/PycharmProjects/FlaskWithNeo4j/run.py", line 1, in
from blog import app
File "C:\Users\abc\PycharmProjects\FlaskWithNeo4j\blog_init.py", line 1, in
from .views import app
File "C:\Users\abc\PycharmProjects\FlaskWithNeo4j\blog\views.py", line 1, in
from .models import User, get_todays_recent_posts
File "C:\Users\abc\PycharmProjects\FlaskWithNeo4j\blog\models.py", line 11, in
graph = Graph(url + '/db/data/')
File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\database_init.py", line 327, in new
use_bolt = version_tuple(inst.remote.get().content["neo4j_version"]) >= (3,)
File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\database\http.py", line 154, in get
response = self.__base.get(headers=headers, redirect_limit=redirect_limit, **kwargs)
File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\packages\httpstream\http.py", line 966, in get
return self.__get_or_head("GET", if_modified_since, headers, redirect_limit, **kwargs)
File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\packages\httpstream\http.py", line 943, in __get_or_head
return rq.submit(redirect_limit=redirect_limit, **kwargs)
File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\packages\httpstream\http.py", line 433, in submit
http, rs = submit(self.method, uri, self.body, self.headers)
File "C:\Users\abc\venv\untitled2\lib\site-packages\py2neo\packages\httpstream\http.py", line 362, in submit
raise SocketError(code, description, host_port=uri.host_port)
py2neo.packages.httpstream.http.SocketError: Unknown error

is uuid4 actually unique when we are dealing with ten thousands of nodes?

(venv) antonina@antonina-HP-Pavilion-g6-Notebook-PC:~/neo4j-flask$ pip install -r requirements.txt
Collecting adium-theme-ubuntu==0.3.4 (from -r requirements.txt (line 1))
Could not find a version that satisfies the requirement adium-theme-ubuntu==0.3.4 (from -r requirements.txt (line 1)) (from versions: )
No matching distribution found for adium-theme-ubuntu==0.3.4 (from -r requirements.txt (line 1))

I'm trying to run it for the second time and i have constraint exception:
~/Desktop/flasktest/nicolewhite-neo4j-flask-27476c5$ python run.py
Traceback (most recent call last):
File "run.py", line 1, in
from blog import app
File "/home/antonina/Desktop/flasktest/nicolewhite-neo4j-flask-27476c5/blog/init.py", line 4, in
graph.schema.create_uniqueness_constraint("User", "username")
File "/usr/local/lib/python2.7/dist-packages/py2neo/database/init.py", line 775, in create_uniqueness_constraint
{"property_keys": [property_key]})
File "/usr/local/lib/python2.7/dist-packages/py2neo/database/http.py", line 212, in post
raise_from(GraphError(message, **content), error)
File "/usr/local/lib/python2.7/dist-packages/py2neo/util.py", line 122, in raise_from
raise exception
py2neo.database.status.ConstraintViolationException: Constraint already exists: CONSTRAINT ON ( user:User ) ASSERT user.username IS UNIQUE

How it can be solved?

Hi,
I am new to pycharm. I am using py2neo.
When I am using termial(inside pycharm), the code is working fine.
But when I use run(Alt+shift+f10), it is giving me import error.

I am not using virtualenv.

Thanks.

Hey Nicole,

I am trying to follow this code and I keep getting "ImportError: No module named py2neo", However, it works fine on python console in Pycharm.

Do you have any idea why this happen? I am using python3.5

Thanks

Hi

I am new to py2neo too, I have download and made changes suggested here to neo4j-flask blog code tutorial on my anaconda enviroment. I am having this error when trying to register user.

ValueError: Node (:U {}) does not belong to this graph

Hi,
when testing the app in the browser (i did not follow the deploy to heroku step) i get this error message:

py2neo.error.Unauthorized
py2neo.error.Unauthorized: http://localhost:7474/db/data/

and a traceback list:

Traceback (most recent call last):
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\_compat.py", line 33, in reraise
    raise value
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\_compat.py", line 33, in reraise
    raise value
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Users\Niels\Anaconda3\lib\site-packages\flask\app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Users\Niels\Documents\Visual Studio 2015\Projects\neo4j_an_d3\neo4j_and_flask\neo4j_and_flask\blog\views.py", line 9, in index
    posts = get_todays_recent_posts()
  File "C:\Users\Niels\Documents\Visual Studio 2015\Projects\neo4j_an_d3\neo4j_and_flask\neo4j_and_flask\blog\models.py", line 41, in get_todays_recent_posts
    posts = graph.cypher.execute(query, today = date())
  File "C:\Users\Niels\Anaconda3\lib\site-packages\py2neo\core.py", line 667, in cypher
    metadata = self.resource.metadata
  File "C:\Users\Niels\Anaconda3\lib\site-packages\py2neo\core.py", line 213, in metadata
    self.get()
  File "C:\Users\Niels\Anaconda3\lib\site-packages\py2neo\core.py", line 261, in get
    raise Unauthorized(self.uri.string)
py2neo.error.Unauthorized: http://localhost:7474/db/data/

I also testet the login credentials as described in the py2neo essentials

$ neoauth neo4j my-p4ssword
Password change not required

It would be nice if you could help me out with this.

Btw. thanks for the great tutorial!

Thanks for the great tutorial. Starting it up, two of us here both experienced problems with uniqueness constraint conflicts. We were eventually able to work around this by commenting out the uniqueness constraint check, but we don't know what the proper fix is.

This occurred even on a freshly deleted (and created) database.
In my case, the flask server was running in debug mode and neo4j was running on special localhost ports.

Here is the stack trace:

Traceback (most recent call last):
  File "/home/dad/jason_work/nicole/venv_nicole/lib/python3.5/site-packages/py2neo/database/http.py", line 203, in post
    response = self.__base.post(body, headers, **kwargs)
  File "/home/dad/jason_work/nicole/venv_nicole/lib/python3.5/site-packages/py2neo/packages/httpstream/http.py", line 984, in post
    return rq.submit(**kwargs)
  File "/home/dad/jason_work/nicole/venv_nicole/lib/python3.5/site-packages/py2neo/packages/httpstream/http.py", line 452, in submit
    return Response.wrap(http, uri, self, rs, **response_kwargs)
  File "/home/dad/jason_work/nicole/venv_nicole/lib/python3.5/site-packages/py2neo/packages/httpstream/http.py", line 489, in wrap
    raise inst
py2neo.packages.httpstream.http.ClientError: 409 Conflict

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "run.py", line 1, in <module>
    from blog import app
  File "/home/dad/jason_work/nicole/blog/__init__.py", line 4, in <module>
    graph.schema.create_uniqueness_constraint("User", "username")
  File "/home/dad/jason_work/nicole/venv_nicole/lib/python3.5/site-packages/py2neo/database/__init__.py", line 775, in create_uniqueness_constraint
    {"property_keys": [property_key]})
  File "/home/dad/jason_work/nicole/venv_nicole/lib/python3.5/site-packages/py2neo/database/http.py", line 212, in post
    raise_from(GraphError(message, **content), error)
  File "/home/dad/jason_work/nicole/venv_nicole/lib/python3.5/site-packages/py2neo/util.py", line 124, in raise_from
    raise exception
py2neo.database.status.ConstraintViolationException: Constraint already exists: CONSTRAINT ON ( user:User ) ASSERT user.username IS UNIQUE

I am trying to use neo4jsandbox.com/browser/ for query.
I don't prefer to download it.
please suggest me a solution.