在 Django CMS 中使用包含标签模板内的 show_placeholder

Question

我正在尝试使用 Django CMS 创建一个投资组合概览页面。

我已经有了我的详细信息页面，并且它们有一个名为 preview-img 的占位符。对于我的投资组合概览页面，我需要遍历所有详细信息页面并呈现该占位符。

Django docs 告诉我inclusion tag 是要走的路。所以我在templatetags 目录中定义了我的标签（show_portfolio），以便它返回页面：

from django import template
from cms.models.pagemodel import Page
from django.template import RequestContext

register = template.Library()

@register.inclusion_tag('portfolio_item.html', takes_context=True)
def show_portfolio(context, parent_slug):
    cms_pages = Page.objects.public()
    cms_pages = [
        page for page in cms_pages
        if page.parent_page and page.parent_page.get_slug() == parent_slug
    ]
    return {
        'cms_pages': cms_pages,
    }

它只是返回带有给定父页面的页面对象（通过 slug）。

我现在在其中循环 cms_pages 的模板是这样的（注意尝试呈现每个页面的 preview show_placeholder）：

[portfolio_item.html]

{% load cms_tags %}

<div class="row">
    {% for page in cms_pages %}
        ...
        {% show_placeholder "preview-img" page %}
        ...
    {% endfor %}
</div>

运行此程序，服务器在尝试评估 show_placeholder 时遇到未捕获的 KeyError（键：request）。我没有看到与我正在做的事情的联系。请求在哪里发挥作用？甚至可以在inclusion tag 的模板中使用show_placeholder 吗？

这是完整性的跟踪：

追溯：

File ".../python3.6/site-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File ".../python3.6/site-packages/django/core/handlers/base.py" in _get_response
  217.                 response = self.process_exception_by_middleware(e, request)

File ".../python3.6/site-packages/django/core/handlers/base.py" in _get_response
  215.                 response = response.render()

File ".../python3.6/site-packages/django/template/response.py" in render
  107.             self.content = self.rendered_content

File ".../python3.6/site-packages/django/template/response.py" in rendered_content
  84.         content = template.render(context, self._request)

File ".../python3.6/site-packages/django/template/backends/django.py" in render
  66.             return self.template.render(context)

File ".../python3.6/site-packages/django/template/base.py" in render
  207.                     return self._render(context)

File ".../python3.6/site-packages/django/template/base.py" in _render
  199.         return self.nodelist.render(context)

File ".../python3.6/site-packages/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File ".../python3.6/site-packages/django/template/base.py" in render_annotated
  957.             return self.render(context)

File ".../python3.6/site-packages/classytags/core.py" in render
  153.         return self.render_tag(context, **kwargs)

File ".../python3.6/site-packages/sekizai/templatetags/sekizai_tags.py" in render_tag
  93.         rendered_contents = nodelist.render(context)

File ".../python3.6/site-packages/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File ".../python3.6/site-packages/django/template/base.py" in render_annotated
  957.             return self.render(context)

File ".../python3.6/site-packages/classytags/core.py" in render
  153.         return self.render_tag(context, **kwargs)

File ".../python3.6/site-packages/cms/templatetags/cms_tags.py" in render_tag
  443.             return toolbar.render_with_structure(context, nodelist)

File ".../python3.6/site-packages/cms/toolbar/toolbar.py" in render_with_structure
  498.         rendered_contents = nodelist.render(context)

File ".../python3.6/site-packages/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File ".../python3.6/site-packages/django/template/base.py" in render_annotated
  957.             return self.render(context)

File ".../python3.6/site-packages/django/template/library.py" in render
  245.         return t.render(new_context)

File ".../python3.6/site-packages/django/template/base.py" in render
  209.                 return self._render(context)

File ".../python3.6/site-packages/django/template/base.py" in _render
  199.         return self.nodelist.render(context)

File ".../python3.6/site-packages/django/template/base.py" in render
  990.                 bit = node.render_annotated(context)

File ".../python3.6/site-packages/django/template/base.py" in render_annotated
  957.             return self.render(context)

File ".../python3.6/site-packages/django/template/defaulttags.py" in render
  216.                     nodelist.append(node.render_annotated(context))

File ".../python3.6/site-packages/django/template/base.py" in render_annotated
  957.             return self.render(context)

File ".../python3.6/site-packages/django/template/library.py" in render
  203.         output = self.func(*resolved_args, **resolved_kwargs)

File ".../python3.6/site-packages/cms/templatetags/cms_tags.py" in _show_placeholder_by_id
  116.     request = context['request']

File ".../python3.6/site-packages/django/template/context.py" in __getitem__
  87.         raise KeyError(key)

Answer 1

通过在包含标签的上下文中显式传递请求，我在我的测试设置中得到了这个工作：

from django import template
from cms.models.pagemodel import Page

register = template.Library()

@register.inclusion_tag('portfolio_item.html', takes_context=True)
def show_portfolio(context, parent_slug):
    cms_pages = Page.objects.public()
    cms_pages = [
        page for page in cms_pages
        if page.parent_page and page.parent_page.get_slug() == parent_slug
    ]
    return {
        'request': context.request,
        'cms_pages': cms_pages,
    }