sorl-thumbnail：在模板的 for 循环内创建缩略图

Question

我正在尝试从图像中创建大小为100x100 px 的缩略图。我正在使用 for 循环，for 循环有效并且图像被渲染，但由于某种原因，当我尝试创建缩略图时它不起作用。

这是我的代码：

{% for post_images in post.sellpostimage_set.all %}
           <img class="thumbnail" src="{{ post_images.pictures.url }}" />

            {% thumbnail post_images "100x100" crop="center" as im %}
                <img src="{{ im.pictures.url }}" width="{{ im.width }}" height="{{ im.height }}">
            {% endthumbnail %}

{% endfor %}

views.py

def post(request, post_name_slug):
    context_dict = {}
    try:

        post = SellPost.objects.get(slug=post_name_slug)
        context_dict['post'] = post

        poster_posts = SellPost.objects.filter(user=post.user).order_by('-timestamp')
        context_dict['poster_posts'] = poster_posts

        post_image = SellPostImage.objects.filter(post=poster_posts)
        context_dict['post_image'] = post_image

        poster = post.user
        context_dict['poster'] = poster

    except SellPost.DoesNotExist:
        return redirect('index')
    return render(request, 'post.html', context_dict, )

编辑：如果我在缩略图 src {{ im.url }} 中使用，我可以获得奇怪的图像位置.. http://127.0.0.1:8000/media/cache/9b/0b/9b0b04d65b1075ed4c3e7783131caef6.jpg ，但缩略图仍然没有被渲染。显示为 URL 已损坏，当我尝试转到图像位置 url 时出现 404 错误。

Answer 1

看来你的复数位置错了：

{% for post_images in post.sellpostimage_set.all %}

应该是：

{% for post_image in post.sellpostimage_set.all %}

---

post_image = SellPostImage.objects.filter(post=poster_posts)
context_dict['post_image'] = post_image

应该是：

post_images = SellPostImage.objects.filter(post=poster_posts)
context_dict['post_images'] = post_images

或：

post_image = SellPostImage.objects.get(post=poster_posts)
context_dict['post_image'] = post_image

---

为什么要在模板中这样做：

{% for post_images in post.sellpostimage_set.all %}

如果上下文中有post_images？

---

这是如何工作的？

<img class="thumbnail" src="{{ post_images.pictures.url }}" />

不应该是：

<img class="thumbnail" src="{{ post_image.picture.url }}" />