I'm trying to do a simple graph query in neo4j from python. My query looks like
def do_query(self):
graph = Graph(settings.NEO4J_CONNECTION_STRING)
query = 'MATCH (n:SomeNode) WHERE n.id = ' + id + ' RETURN n'
data = graph.cypher.execute(query)
but when I run it in a Django REST handler, I get the following error
Traceback (most recent call last):
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/django/core/handlers/base.py", line 149, in get_response
response = self.process_exception_by_middleware(e, request)
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/django/core/handlers/base.py", line 147, in get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
return view_func(*args, **kwargs)
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
return self.dispatch(request, *args, **kwargs)
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/rest_framework/views.py", line 466, in dispatch
response = self.handle_exception(exc)
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/rest_framework/views.py", line 463, in dispatch
response = handler(request, *args, **kwargs)
File "/Users/me/Development/app/search/api/views.py", line 351, in get
results = graph_queries.do_query(user_id)
File "/Users/me/Development/app/app/graph_queries.py", line 43, in do_query
data = graph.cypher.execute(query)
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/py2neo/core.py", line 661, in cypher
metadata = self.resource.metadata
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/py2neo/core.py", line 213, in metadata
self.get()
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/py2neo/core.py", line 258, in get
response = self.__base.get(headers=headers, redirect_limit=redirect_limit, **kwargs)
File "/Users/me/.virtualenvs/app/lib/python2.7/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 "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 943, in __get_or_head
return rq.submit(redirect_limit=redirect_limit, **kwargs)
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 433, in submit
http, rs = submit(self.method, uri, self.body, self.headers)
File "/Users/me/.virtualenvs/app/lib/python2.7/site-packages/py2neo/packages/httpstream/http.py", line 302, in submit
raise ValueError("Unsupported URI scheme " + repr(uri.scheme))
ValueError: Unsupported URI scheme None
I'm not really sure where to begin. I'm pretty confident the connection to Neo4J is good, and the handler is being invoked correctly as shown in the traceback. Is there something wrong with my query?
Turns out the problem was I was using import settings rather than from django.conf import settings, which meant I wasn't reading the correct setting.
Related
I have a few Django Rest Framework API endpoints I want to test.
They are behind an authenticated page. I'm trying to use the DRF RequestsClient to do that.
My code looks like this:
from rest_framework.test import APITestCase
from rest_framework.test import RequestsClient
from django.urls import reverse
import requests
URL_PREFIX="http://testserver"
API_TOKEN="tfhgffhgf675h"
class APITests(APITestCase):
#staticmethod
def _get_full_url(url, *args, **kwargs):
return URL_PREFIX + reverse(url, *args, **kwargs)
def setUp(self):
self.client = RequestsClient()
def test_stuff(self):
url = self._get_full_url("ahs:agena_results-list")
# Raw requests library - works fine
# Note: Testing shows that the RequestsClient() seems to do some sort of magic to
# be able to resolve http://testserver. A raw requests GET request must hit it at
# 127.0.0.1, and specify the port
response = requests.get("http://127.0.0.1:8000", headers={"Authorization": f"Token {API_TOKEN}"})
# RequestsClient() - doesn't work
response = self.client.get(url, headers={"Authorization": f"Token {API_TOKEN}"})
My RequestsClient request doesn't work, but my raw requests request works fine.
The exception raised when using the RequestsClient is pretty cryptic:
Internal Server Error: /ahs/api/agena_results/
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/compiler.py", line 1361, in execute_sql
cursor.execute(sql, params)
File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py", line 67, in execute
return self._execute_with_wrappers(
File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py", line 80, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py", line 83, in _execute
self.db.validate_no_broken_transaction()
File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/base.py", line 480, in validate_no_broken_transaction
raise TransactionManagementError(
django.db.transaction.TransactionManagementError: An error occurred in the current transaction. You can't execute queries until the end of the 'atomic' block.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/django/core/handlers/exception.py", line 55, in inner
response = get_response(request)
File "/usr/local/lib/python3.9/site-packages/django/core/handlers/base.py", line 197, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python3.9/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "/usr/local/lib/python3.9/site-packages/rest_framework/viewsets.py", line 125, in view
return self.dispatch(request, *args, **kwargs)
File "/usr/local/lib/python3.9/site-packages/rest_framework/views.py", line 509, in dispatch
response = self.handle_exception(exc)
File "/usr/local/lib/python3.9/site-packages/rest_framework/views.py", line 469, in handle_exception
self.raise_uncaught_exception(exc)
File "/usr/local/lib/python3.9/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
raise exc
File "/usr/local/lib/python3.9/site-packages/rest_framework/views.py", line 497, in dispatch
self.initial(request, *args, **kwargs)
File "/usr/local/lib/python3.9/site-packages/rest_framework/views.py", line 414, in initial
self.perform_authentication(request)
File "/usr/local/lib/python3.9/site-packages/rest_framework/views.py", line 324, in perform_authentication
request.user
File "/usr/local/lib/python3.9/site-packages/rest_framework/request.py", line 227, in user
self._authenticate()
File "/usr/local/lib/python3.9/site-packages/rest_framework/request.py", line 380, in _authenticate
user_auth_tuple = authenticator.authenticate(self)
File "/usr/local/lib/python3.9/site-packages/rest_framework/authentication.py", line 196, in authenticate
return self.authenticate_credentials(token)
File "/usr/local/lib/python3.9/site-packages/rest_framework/authentication.py", line 201, in authenticate_credentials
token = model.objects.select_related('user').get(key=key)
File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py", line 492, in get
num = len(clone)
File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py", line 302, in __len__
self._fetch_all()
File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py", line 1507, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py", line 57, in __iter__
results = compiler.execute_sql(
File "/usr/local/lib/python3.9/site-packages/django/db/models/sql/compiler.py", line 1364, in execute_sql
cursor.close()
File "/usr/local/lib/python3.9/site-packages/MySQLdb/cursors.py", line 83, in close
while self.nextset():
File "/usr/local/lib/python3.9/site-packages/MySQLdb/cursors.py", line 137, in nextset
nr = db.next_result()
MySQLdb._exceptions.OperationalError: (2006, '')
.
----------------------------------------------------------------------
Ran 1 test in 30.774s
The strange thing is that if I remove the Authorization header from the RequestsClient request, it doesn't crash, but does return a 403, so that doesn't help me.
I also tried setting the Authorization header on the RequestsClient this way, but that didn't help either:
self.client.headers.update({'Authorization': f'Token {API_TOKEN}'})
Any idea what I'm doing wrong?
Using APILiveServerTestCase instead of APITestCase when using RequestsClient solves the problem.
Apparently, the poor documentation around this has been known for some time now, but does not appear to have improved since then.
I use geopy to convet a coordinate into an address in order to get the name of the country and this is my code :
def convert_latandlong_to_address(self):
geolocator = Nominatim(user_agent="miz")
location = geolocator.reverse(self.lat+","+self.lng,timeout=10)
address = location.raw['address']
return address
it works fine but i realized that after several requests it returns 502 error :
geopy.exc.GeocoderServiceError: Non-successful status code 502
and this is full traceback:
Traceback (most recent call last):
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/geopy/geocoders/base.py", line 360, in _call_geocoder
result = self.adapter.get_json(url, timeout=timeout, headers=req_headers)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/geopy/adapters.py", line 373, in get_json
resp = self._request(url, timeout=timeout, headers=headers)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/geopy/adapters.py", line 401, in _request
raise AdapterHTTPError(
geopy.adapters.AdapterHTTPError: Non-successful status code 502
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/django/core/handlers/base.py", line 181, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/django/views/generic/base.py", line 70, in view
return self.dispatch(request, *args, **kwargs)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/rest_framework/views.py", line 509, in dispatch
response = self.handle_exception(exc)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/rest_framework/views.py", line 469, in handle_exception
self.raise_uncaught_exception(exc)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
raise exc
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/rest_framework/views.py", line 506, in dispatch
response = handler(request, *args, **kwargs)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/rest_framework/decorators.py", line 50, in handler
return func(*args, **kwargs)
File "/home/admin1/mizbanproject/location/preferlocation/api/views.py", line 15, in get_prefer_locations
address = location_obj.convert_latandlong_to_address()
File "/home/admin1/mizbanproject/location/preferlocation/api/utils.py", line 27, in convert_latandlong_to_address
location = geolocator.reverse(self.lat+","+self.lng,timeout=10)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/geopy/geocoders/nominatim.py", line 359, in reverse
return self._call_geocoder(url, callback, timeout=timeout)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/geopy/geocoders/base.py", line 378, in _call_geocoder
self._adapter_error_handler(error)
File "/home/admin1/envs/myvenv/lib/python3.8/site-packages/geopy/geocoders/base.py", line 392, in _adapter_error_handler
raise exc_cls(str(error)) from error
geopy.exc.GeocoderServiceError: Non-successful status code 502
and after a few seconds or minutes when i run the code again it works i can't figure out what causes this problem and how can i prevent it ?
I am making a website for myself. When I tried making a cart, it was crashing, but everything else works perfectly.
Here is the error:
Traceback (most recent call last):
File "C:\Users\Kali\PycharmProjects\djangoProject\venv\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
File "C:\Users\Kali\PycharmProjects\djangoProject\venv\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Kali\PycharmProjects\djangoProject\venv\lib\site-packages\django\views\generic\base.py", line 70, in view
return self.dispatch(request, *args, **kwargs)
File "C:\Users\Kali\PycharmProjects\djangoProject\venv\lib\site-packages\django\views\generic\base.py", line 98, in dispatch
return handler(request, *args, **kwargs)
File "C:\Users\Kali\PycharmProjects\djangoProject\shop\mainapp\views.py", line 47, in get
customer = Customer.objects.get(user=request.user)
File "C:\Users\Kali\PycharmProjects\djangoProject\venv\lib\site-packages\django\db\models\manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\Kali\PycharmProjects\djangoProject\venv\lib\site-packages\django\db\models\query.py", line 429, in get
raise self.model.DoesNotExist(
mainapp.models.Customer.DoesNotExist: Customer matching query does not exist.
You are using the query Customer.objects.get(....) without a try except at line 47 of file C:\Users\Kali\PycharmProjects\djangoProject\shop\mainapp\views.py
This means that the customer you are trying to retrieve does not exist in the database. Countercheck the parameters you are using to get the Customer.
Your code should be:
try:
customer = Customer.objects.get(....)
except Customer.DoesNotExist as e:
...
I installed the django_message package into my django app using django 2.0 and while it works on my development machine, it throws the following errors on production when I try to open the list of messages from Django Admin console.
TypeError: __str__ returned non-string (type NoneType)
[22/Mar/2019 15:08:12] ERROR [django.request:118] Internal Server Error: /admin/django_messages/message/
Traceback (most recent call last):
File "/opt/site_env/lib/python3.6/site-packages/django/core/handlers/exception.py", line 35, in inner
response = get_response(request)
File "/opt/site_env/lib/python3.6/site-packages/django/core/handlers/base.py", line 128, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/opt/site_env/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/options.py", line 574, in wrapper
return self.admin_site.admin_view(view)(*args, **kwargs)
File "/opt/site_env/lib/python3.6/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "/opt/site_env/lib/python3.6/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
response = view_func(request, *args, **kwargs)
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/sites.py", line 223, in inner
return view(request, *args, **kwargs)
File "/opt/site_env/lib/python3.6/site-packages/django/utils/decorators.py", line 62, in _wrapper
return bound_func(*args, **kwargs)
File "/opt/site_env/lib/python3.6/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "/opt/site_env/lib/python3.6/site-packages/django/utils/decorators.py", line 58, in bound_func
return func.__get__(self, type(self))(*args2, **kwargs2)
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/options.py", line 1570, in changelist_view
cl = self.get_changelist_instance(request)
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/options.py", line 705, in get_changelist_instance
self,
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/views/main.py", line 76, in __init__
self.queryset = self.get_queryset(request)
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/views/main.py", line 320, in get_queryset
filters_use_distinct) = self.get_filters(request)
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/views/main.py", line 130, in get_filters
self.model, self.model_admin, field_path=field_path
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/filters.py", line 157, in create
return list_filter_class(field, request, params, model, model_admin, field_path=field_path)
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/filters.py", line 168, in __init__
self.lookup_choices = self.field_choices(field, request, model_admin)
File "/opt/site_env/lib/python3.6/site-packages/django/contrib/admin/filters.py", line 195, in field_choices
return field.get_choices(include_blank=False)
File "/opt/site_env/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 812, in get_choices
limit_choices_to)]
File "/opt/site_env/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 811, in <listcomp>
for x in rel_model._default_manager.complex_filter(
File "/opt/site_env/lib/python3.6/site-packages/django/utils/encoding.py", line 34, in smart_text
return force_text(s, encoding, strings_only, errors)
File "/opt/site_env/lib/python3.6/site-packages/django/utils/encoding.py", line 67, in force_text
s = str(s)
TypeError: __str__ returned non-string (type NoneType)
The biggest concern is that this is not the only model that is throwing the error. I have the same from django-allauth throwing the same error with SocialAccount.
Another concern is that I don't think I should be fixing the codes from this packages but I am left with nothing else.
Also to note, that none of the models for the application itself causes these error.
Only applies to django_allauth and django_messages. However, the failure doesn't happen in my development machine.
The mysql table for django_messages is empty (without records).
Is there a config that causes these kinds of errors or somethings.
I am using django 2.0 and python 3.6 in both enviroments.
Figured out.
It turns out that all the models failing are related to the User model whose str() method points to a field that has its database column as NULLs.
Solution: I have to make that field not nullable at the database level and at django level by assigning default value at the pre_save phase.
It worked.
I recently upgraded from Django 1.6.11 to Django 1.8.9, and installed django-formtools==1.0 as part of the process. I am getting this error, which does not point to a single line of my code. Has anyone come across this?
Internal Server Error: /accounts/activation-process/maria-cristo-2/
Traceback (most recent call last):
File "/home/vagrant/virtualenvs/staging/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/vagrant/virtualenvs/staging/local/lib/python2.7/site-packages/django/views/generic/base.py", line 71, in view
return self.dispatch(request, *args, **kwargs)
File "/home/vagrant/virtualenvs/staging/local/lib/python2.7/site-packages/formtools/wizard/views.py", line 237, in dispatch
response = super(WizardView, self).dispatch(request, *args, **kwargs)
File "/home/vagrant/virtualenvs/staging/local/lib/python2.7/site-packages/django/views/generic/base.py", line 89, in dispatch
return handler(request, *args, **kwargs)
File "/home/vagrant/virtualenvs/staging/local/lib/python2.7/site-packages/formtools/wizard/views.py", line 300, in post
return self.render_done(form, **kwargs)
File "/home/vagrant/virtualenvs/staging/local/lib/python2.7/site-packages/formtools/wizard/views.py", line 358, in render_done
self.storage.reset()
File "/home/vagrant/virtualenvs/staging/local/lib/python2.7/site-packages/formtools/wizard/storage/base.py", line 34, in reset
wizard_files = self.data[self.step_files_key]
File "/home/vagrant/virtualenvs/staging/local/lib/python2.7/site-packages/formtools/wizard/storage/session.py", line 13, in _get_data
return self.request.session[self.prefix]
File "/home/vagrant/virtualenvs/staging/local/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py", line 48, in __getitem__
return self._session[key]
KeyError: 'wizard_activation_wizard'