求助 关于Django ，AttributeError：'Topic' object has no attribute 'owner'

Question

python编程入门到实践第十九章中的问题

浏览器报错信息如下

关于我的views.py 的代码如下

from django.shortcuts import render
from django.http import HttpResponseRedirect, Http404
from django.urls import reverse
from django.contrib.auth.decorators import login_required

from .models import Topic, Entry
from .forms import TopicForm, EntryForm



# Create your views here.
def index(request):
    '''
    学习笔记的主页
    :return:
    '''
    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)




@login_required
def new_topic(request):
    '''添加新主题'''
    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)


def edit_entry(request, entry_id):
    """Edit an existing entry."""
    entry = Entry.objects.get(id=entry_id)
    topic = entry.topic
    if topic.owner != request.user:
        raise Http404

    if request.method != 'POST':
        # Initial request; pre-fill form with the current entry.
        form = EntryForm(instance=entry)
    else:
        # POST data submitted; process data.
        form = EntryForm(instance=entry, data=request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('learning_logs:topic',
                                                args=[topic.id]))

    context = {'entry': entry, 'topic': topic, 'form': form}
    return render(request, 'learning_logs/edit_entry.html', context)


def topic(request, topic_id):
    """Show a single topic, and all its entries."""
    topic = Topic.objects.get(id = topic_id)
    # Make sure the topic belongs to the current user.
    if topic.owner != request.user:
        raise Http404

    entries = topic.entry_set.order_by('-date_added')
    context = {'topic': topic, 'entries': entries}
    return render(request, 'learning_logs/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 topic.owner != request.user:
        raise Http404

    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 HttpResponseRedirect(reverse('learning_logs:topic',
                                                args=[topic_id]))

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

Answer 1

根据页面的报错信息，报错的地方应该是 if topic.owner != request.user: 这一行，报错的原因是 topic 没有owner属性，因为没有具体的表结构，无法做出进一步推断，你可以自己调试下，目测很简单