在 Django 的自定义管理器中面临问题

Question

我正在尝试创建一个自定义管理器来检索所有状态为 已发布 的帖子。管理人员的新手！！提前谢谢你 <3.

models.py


class PublishedManager(models.Model):
    def get_query_set(self):
        return super(PublishedManager, self).get_query_set().filter(status='published')


class Post(models.Model):
    STATUS_CHOICES = (
        ('draft', 'Draft'),
        ('published', 'Published'),
    )
    title = models.CharField(max_length=255)
    slug = models.SlugField(max_length=255, unique_for_date='publish')
    author = models.ForeignKey(
        User, on_delete=models.CASCADE, related_name='blog_posts')
    body = models.TextField()
    publish = models.DateTimeField(default=timezone.now)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    status = models.CharField(
        max_length=10, choices=STATUS_CHOICES, default='draft')
    objects = models.Manager()
    published = PublishedManager()

    class Meta:
        ordering = ('-publish',)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('blog:post_detail', args=[self.publish.year, self.publish.month, self.publish.day, self.slug])

views.py

def post_list(request):
    posts = Post.published.all()
    print(posts)
    return render(request, 'post/list.html', {'posts': posts})


def post_detail(request):
    post = get_object_or_404(Post, slug=post, status='published',
                             publish__year=year, publish__month=month, publish__day=day)

    return render(request, 'post/detail.html', {'post': post})

错误

'PublishedManager' object has no attribute 'all' (views.py, line 6, in post_list)

Answer 1

您应该使用 Manager 作为经理的基础 class，而不是 Model。并且方法名称应该是 get_queryset 而不是 get_query_set:

class PublishedManager(models.Manager):
    def get_queryset(self):
        return super(PublishedManager, self).get_queryset().filter(status='published')

您可以在 docs 中找到更多详细信息。

Answer 2

您的 PublishManager 应该是 Manager，而不是 Model。此外，要覆盖的方法是 get_queryset，而不是 ~~get_query_set~~:

#                  use Manager ↓
class PublishedManager(models.Manager):

    # not get_query_set ↓
    def <strong>get_queryset</strong>(self):
        return super().get_queryset().filter(status='published')

在视图中，您可能希望使用 published 管理器来防止重复相同的逻辑，因此：

def post_detail(request):
    post = get_object_or_404(
        <strong>Post.published.all()</strong>,
        slug=post, status='published', publish__year=year,
        publish__month=month, publish__day=day
    )

    return render(request, 'post/detail.html', {'post': post})

在 Django 的自定义管理器中面临问题

Facing issue in custom manager of django

python

django

django-models

django-views

django-custom-manager