从Django网站更改链接预览图像

如何解决从Django网站更改链接预览图像

我想在社交媒体上分享文章的link，但是链接预览显示的是我的图像（作者的图像），而不是帖子的精选图像。我已经尝试过SEO元标记。我要显示的图像是this。我不知道我在做什么错。如何更改链接预览缩略图？

models.py

.....
...
class Post(ModelMeta,models.Model):
    author = models.ForeignKey('auth.User',on_delete=models.CASCADE)
    title = models.CharField(max_length=200)
    text = models.TextField()
    image_file = models.ImageField(upload_to='media',null=True,blank=True)
    image_url = models.URLField(null=True,blank=True)
    category = models.ForeignKey(Category,verbose_name="Category",on_delete=models.CASCADE,null=True)
    published_date = models.DateTimeField(blank=True,default=timezone.now,null=True)

    _metadata = {
        'title': 'title','image': 'get_meta_image',}

    def get_meta_image(self):
        if self.image_file:
            self.image = self.image_file
            return self.image.url
        else:
            self.image = self.image_url
            return self.image.url

    class Meta:
        verbose_name = "Post"
        verbose_name_plural = "Posts"
        ordering = ('-published_date',)

    def get_absolute_url(self):
        return reverse("post_detail",kwargs={'pk':self.pk})

    def __str__(self):
        return self.title
.....
...

views.py

.....
...
class PostDetailView(DetailView):
    model = Post
    template_name = "blog/post_detail.html"

    def post(self,request,*args,**kwargs):
        self.object = self.get_object()
        context = self.get_context_data()
        if request.method == 'POST':
            form = SubscriberForm(request.POST)
            if context["form"].is_valid():
                context["email"] = request.POST.get('email')
                form.save()
                messages.success(request,'Thank you for subscribing')
                return redirect('/')
            else:
                form = SubscriberForm()

    def get_context_data(self,**kwargs):
        # Call the base implementation first to get a context
        context = super(PostDetailView,self).get_context_data(**kwargs)
        # Add in a QuerySet of all the books
        context['post_list'] = Post.objects.all()
        context['categories'] = Category.objects.all()
        context['meta'] = self.get_object().as_meta(self.request)
        form = SubscriberForm(self.request.POST or None)  # instance= None
        context["form"] = form
        return context
.....
...

base.html

  <head>
    .....
    ...
    {% block meta_extend %}
    {% endblock %}

    <title>SilverCyber Blog</title>
    .....
    ...
</head>

post_detail.html

{% extends "blog/base.html" %}
{% load static %}

{% block meta_extend %}
  <meta name="title" content="{{ obj.title }}">
  <meta property="og:image" content="{{ obj.image }}">
{% endblock %}
.....
...

从Django网站更改链接预览图像

如何解决从Django网站更改链接预览图像

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