topic = Topic.objects.filter(owner=request.user).order_by('date_added') 不工作

Question

我是 Django 的初学者，我正在使用一本名为 Python Crash Course 的书来指导我。我目前正在做应用程序开发项目，但遇到了一些错误。显然，错误是由这一行引起的：topics = Topic.objects.filter(owner=request.user).order_by('date_added')。这是我的views.py的完整代码：

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

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

def index(request):
    return render(request, 'learning_logs/index.html')

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

@login_required
def topic(request, topic_id):
    topic = Topic.objects.get(id=topic_id)
    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)

@login_required
def new_topic(request):
    if request.method != 'POST':
        form = TopicForm()
    else:
        form = TopicForm(data=request.POST)
        if form.is_valid():
            new_topic = form.save(commit=False)
            new_topic.owner = request.user
            new_topic.save()
            form.save()
            return HttpResponseRedirect(reverse('learning_logs:topics'))

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

@login_required
def new_entry(request, topic_id):
    topic = Topic.objects.get(id=topic_id)

    if request.method != 'POST':
        form = EntryForm()
    else:
        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)

@login_required
def edit_entry(request, entry_id):
    entry = Entry.objects.get(id=entry_id)
    topic = entry.topic
    if topic.owner != request.user:
        raise Http404

    if request.method != 'POST':
        form = EntryForm(instance=entry)
    else:
        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)

我多次检查此文件，但一直收到此错误：Cannot resolve keyword 'owner' into field. Choices are: date_added, entry, id, text。我查看了许多具有解决方案的资源，但它们对我不起作用。有没有办法解决这个问题？

这是我的主题模型：

class Topic(models.Model):
    text = models.CharField(max_length=200)
    date_added = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.text

谢谢！

Answer 1

您必须将owner 字段添加到Topic 模型。

from django.contrib.auth.models import User
...

class Topic(models.Model):
    text = models.CharField(max_length=200)
    date_added = models.DateTimeField(auto_now_add=True)
    owner = models.ForeignKey(User, on_delete=models.CASCADE)

    def __str__(self):
        return self.text

之后记得makemigrations和migrate他们:)