python - Django 创建帖子

Question

我正在尝试在论坛上创建一个新帖子，它确实有效，我也在打印表单是否有效，但是当我在帖子未发布后去检查时。在管理页面中，帖子在那里，已批准，但缺少标签和类别字段。它们是在创建帖子时添加的，否则我会收到错误消息。但是我必须在管理页面中手动添加它们才能将帖子发布到论坛。

这是我在模型中的帖子

class Post(models.Model):
    title = models.CharField(max_length=400)
    slug = models.SlugField(max_length=400, unique=True, blank=True)
    user = models.ForeignKey(Author, on_delete=models.CASCADE)
    content = HTMLField()
    categories = models.ManyToManyField(Category)
    date = models.DateTimeField(auto_now_add=True)
    approved = models.BooleanField(default=True)
    tags = TaggableManager()
    comments = models.ManyToManyField(Comment, blank=True)
    # closed = models.BooleanField(default=False)
    # state = models.CharField(max_length=40, default="zero")

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.title)
        super(Post, self).save(*args, **kwargs)

    def __str__(self):
        return self.title

这是我的views.py

@login_required
def create_post(request):
    context = {}
    form = PostForm(request.POST or None)
    if request.method == "POST":
        if form.is_valid():
            print("\n\n form is valid")
            author = Author.objects.get(user=request.user)
            new_post = form.save(commit=False)
            new_post.user = author
            new_post.save()

            return redirect('forums')
        
    context.update({
            'form': form,
            'title': 'Create New Post'
    })
    return render(request, 'forums/create_post.html', context)

html 非常简单，可以测试。

<form method="POST">
                            {% csrf_token %}    
                            {{form|crispy}}
                            <!-- Submit Post -->
                            <input type="submit" value="Save">
                        </form>

如有任何帮助，我们将不胜感激

Answer 1

new_post = form.save(commit=False) 行不会根据 docs 保存多对多关系。 .解决方法

new_post = form.save(commit=False)
new_post.user = author
new_post.save()
form.save_m2m()

摘自 docs

Another side effect of using commit=False is seen when your model hasa many-to-many relation with another model. If your model has amany-to-many relation and you specify commit=False when you save aform, Django cannot immediately save the form data for themany-to-many relation. This is because it isn’t possible to savemany-to-many data for an instance until the instance exists in thedatabase.

To work around this problem, every time you save a form usingcommit=False, Django adds a save_m2m() method to your ModelFormsubclass. After you’ve manually saved the instance produced by theform, you can invoke save_m2m() to save the many-to-many form data.

我认为这并不能解决所有问题，但请尝试一下。