Django.core.Exceptions.ImproperlyConfigured: создание ModelForm без атрибута «fields» или атрибута «exclude» запрещено. ⇐ Python

[Anonymous]

Код: Выделить всё

(ll_env) brads-MacBook-Pro:learning_log $ python manage.py runserver
Performing system checks...

Unhandled exception in thread started by 
Traceback (most recent call last):
File "/learning_log/ll_env/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
fn(*args, **kwargs)
File "/learning_log/ll_env/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 117, in inner_run
self.check(display_num_errors=True)
File "/learning_log/ll_env/lib/python3.6/site-packages/django/core/management/base.py", line 379, in check
include_deployment_checks=include_deployment_checks,
File "/learning_log/ll_env/lib/python3.6/site-packages/django/core/management/base.py", line 366, in _run_checks
return checks.run_checks(**kwargs)
File "/learning_log/ll_env/lib/python3.6/site-packages/django/core/checks/registry.py", line 71, in run_checks
new_errors = check(app_configs=app_configs)
File "/learning_log/ll_env/lib/python3.6/site-packages/django/core/checks/urls.py", line 13, in check_url_config
return check_resolver(resolver)
File "/learning_log/ll_env/lib/python3.6/site-packages/django/core/checks/urls.py", line 23, in check_resolver
return check_method()
File "/learning_log/ll_env/lib/python3.6/site-packages/django/urls/resolvers.py", line 396, in check
for pattern in self.url_patterns:
File "/learning_log/ll_env/lib/python3.6/site-packages/django/utils/functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/learning_log/ll_env/lib/python3.6/site-packages/django/urls/resolvers.py", line 533, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/learning_log/ll_env/lib/python3.6/site-packages/django/utils/functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/learning_log/ll_env/lib/python3.6/site-packages/django/urls/resolvers.py", line 526, in urlconf_module
return import_module(self.urlconf_name)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 978, in _gcd_import
File "", line 961, in _find_and_load
File "", line 950, in _find_and_load_unlocked
File "", line 655, in _load_unlocked
File "", line 678, in exec_module
File "", line 205, in _call_with_frames_removed
File "/learning_log/learning_log/urls.py", line 23, in 
url(r'',include('learning_logs.urls',namespace='learning_logs')),
File "/learning_log/ll_env/lib/python3.6/site-packages/django/urls/conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 978, in _gcd_import
File "", line 961, in _find_and_load
File "", line 950, in _find_and_load_unlocked
File "", line 655, in _load_unlocked
File "", line 678, in exec_module
File "", line 205, in _call_with_frames_removed
File "/learning_log/learning_logs/urls.py", line 2, in 
from .  import views
File "/learning_log/learning_logs/views.py", line 6, in 
from .forms import TopicForm
File "/learning_log/learning_logs/forms.py", line 4, in 
class TopicForm(forms.ModelForm):
File "/learning_log/ll_env/lib/python3.6/site-packages/django/forms/models.py", line 243, in __new__
"needs updating." % name
django.core.exceptions.ImproperlyConfigured: Creating a ModelForm without either the 'fields' attribute or the 'exclude' attribute is prohibited; form TopicForm needs updating.

некоторая часть кода:
manage.py

Код: Выделить всё

#!/usr/bin/env python
import os
import sys

if __name__ == '__main__':
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'learning_log.settings')
try:
from django.core.management import execute_from_command_line
except ImportError as exc:
raise ImportError(
"Couldn't import Django. Are you sure it's installed and "
"available on your PYTHONPATH environment variable? Did you "
"forget to activate a virtual environment?"
) from exc
execute_from_command_line(sys.argv)

views.py

Код: Выделить всё

from django.shortcuts import render
from .models import Topic
from django.http import HttpResponseRedirect
#from django.core.urlresolvers import reverse
from django.urls import reverse
from .forms import TopicForm

# Create your views here.
def index(request):
return render(request,'learning_logs/index.html')

def topics(request):
topics=Topic.objects.order_by('date_added')
context={'topics':topics}
return render(request,'learning_logs/topics.html',context)

def topic(request,topic_id):
topic=Topic.objects.get(id=topic_id)
entries=topic.entry_set.order_by('-date_added')
context={'topic':topic,'entries':entries}
return render(request,'learning_logs/topic.html',context)

def new_topic(request):
if request.method != 'POST':
form = TopicForm()
else:
form = TopicForm(request.POST)
if form.is_valid():
form.save()
return HttpResponseRedirect(reverse('learning_logs:topics'))

context = {'form',form}
return render(request,'learning_logs/new_topic.html',context)

Итак, я изучал Python по книге Ускоренный курс Python: практическое введение в программирование на основе проектов. И когда я «запустил сервер», он просто показал вышеуказанную ошибку. Я не знаю, что было не так, потому что я сделал именно то, что написано в книге. Может ли кто-нибудь мне помочь?
что произошло, когда я попробовал выполнить описанные выше действия.
Есть идеи?

Подробнее здесь: https://stackoverflow.com/questions/517 ... out-either