如何在 django 中解决 AttributeError: module 'learning_logs.views' has no attribute 'new_entry'

Question

我正在学习教科书《Python 速成课程第三版》，我检查了我的代码，一切看起来都是正确的，但是当我 python manage.py runserver 时，我收到了错误。

from django.shortcuts import render, redirect


# Create your views here.
from .models import Topic
from .forms import TopicForm, EntryForm




def index(request):
    """The home page for learning Log."""
    return render(request, 'learning_logs/index.html')


def topics(request):
    """Show all topics."""

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


def topic(request, topic_id):
    """Show a single topic and all its entries."""
    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):
    """Add a new topic"""
    if request.method != 'POST':
        # No data submitted; create a blank form.
        form = TopicForm()
    else:
        # POST data submitted; process data.
        form = TopicForm(data=request.POST)
        if form.is_valid():
            form.save()
            return redirect('learning_logs:topics')
        # Display a blank or invalid form.
        context = {'form: form'}
        return render(request, 'learning_logs/new_topic.html', context)
    def new_entry(request, topic_id):
        """Add a new entry for a particular topic."""
        topic = Topic.objects.get(id=topic_id)


        if request.method != 'POST':
            # No data submitted; create a blank form.
            form = EntryForm()
        else:
            # POST data submitted; process data.
            form = EntryForm(data=request.POST)
            if form.is_valid():
                new_entry = form.save(commit=False)
                new_entry.topic = topic
                new_entry.save()
                return redirect('learning_logs:topic', topic_id=topic_id)
            
    # Display a blank or invalic form.
    context = {'topic': topic, 'form': form}
    return render(request, 'learning_logs/new_entry.html', context)type here
The learning_logs/urls
from django.urls import path

from . import views

app_name = 'learning_logs'
urlpatterns = [
    # Home page
    path('', views.index, name="index"),
    # Page that shows all topics.
    path('topics/', views.topics, name='topics'),
    
    # Detail page for a single topic.
    path('topics/<int:topic_id>/', views.topic, name='topic'),
    # Page for adding a new topic,\
    path('new_topic/', views.new_topic, name='new_topic'),

    # Page for adding a new entry
    path('new_entry/<int:topic_id>/', views.new_entry, name='new_entry'),

我尝试过一遍教科书中打印的每一行。一切看起来都不错。不明白为什么我会收到错误。我希望服务器将我带到 localhost:8000/new_topic

Answer 1

您正在

new_entry

中定义

new_topic

。小心空白。如果一个函数定义在另一个未缩进的函数定义下缩进，则缩进的定义是另一个函数作用域的一部分，并且不能在其他模块中导入。要解决此问题，请确保

def new_entry(...)

未缩进：

def new_topic(request):
    """Add a new topic"""
    # new_topic logic here

def new_entry(request, topic_id):
    """Add a new entry for a particular topic."""
    # new_entry logic here