如何在 Django 上使用 DetailView 显示消息

Question

我有消息模型和 Post 模型。

我想显示 post 发送给一个 post 的所有消息。

我想不出如何使用 DetailView Class 在某个 post 获取所有消息。

我该怎么做？或者我应该为消息创建另一个 ListView Class？

models.py

class Post(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    date_posted = models.DateTimeField(default=timezone.now)
    author = models.ForeignKey(User,on_delete=models.CASCADE)
    topic = models.ForeignKey(Topic,on_delete=models.SET_NULL,null=True)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('post-detail',kwargs={'pk':self.pk})


class Message(models.Model):
    user = models.ForeignKey(User,on_delete=models.CASCADE) 
    post = models.ForeignKey(Post,on_delete=models.CASCADE)
    body = models.TextField()
    date_posted = models.DateTimeField(default=timezone.now)

    def __str__(self):
        return self.body[0:50]

views.py

class PostDetailView(DetailView):
    model = Post

Answer 1

在模板中，您可以将其呈现为：

{% for message in object.message_set.all %}
    {{ message.body }}
{% endfor %}

因此，对于名为 object 的上下文中的 Post 对象，这将检索所有相关的 Messages。

如果您还想获取相关用户的数据，您可以使用 Prefetch object ^[Django-doc]:

from django.db.models import Prefetch

class PostDetailView(DetailView):
    model = Post
    queryset = Post.objects.prefetch_related(
        <strong>Prefetch(</strong>'message_set', Message.objects<strong>.select_related('user'))</strong>
    )

Note: It is normally better to make use of the settings.AUTH_USER_MODEL ^[Django-doc] to refer to the user model, than to use the User model ^[Django-doc] directly. For more information you can see the referencing the User model section of the documentation.

Note: Django's DateTimeField ^[Django-doc] has a auto_now_add=… parameter ^[Django-doc] to work with timestamps. This will automatically assign the current datetime when creating the object, and mark it as non-editable (editable=False), such that it does not appear in ModelForms by default.

如何在 Django 上使用 DetailView 显示消息

How to show messages using DetailView on Django

python

django

detailview