发生KeyError时-请求-Django templatetag

Question

这是我在模板标签中的代码

httr

在模板中，它用作library(httr) set_config(use_proxy(url="http://proxy.mycompanyname.com", port=****)) ，问题是@register.simple_tag(takes_context=True, name=CAR_TEMPLATE_TAG_NAME) def g_c(context,session_key=None,c_class=Car): request = context['request'] return c_class(request, session_key=session_key) 处的keyerror'request'

这是我的模板上下文，

{% g_c as car %}

这是尝试，

这是templatetag中添加的新行

request = context['request']

已添加设置

'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
               # 'django.core .context_processors.request,
                'django.contrib.auth.context_processors.auth',
                'django.template.context_processors.i18n',
                'django.template.context_processors.media',
                'django.template.context_processors.static',
                'django.template.context_processors.tz',
                'django.contrib.messages.context_processors.messages',
            ],

Answer 1

您必须先导入设置：

from django.conf.settings import TEMPLATE_CONTEXT_PROCESSORS

Answer 2

默认设置包括请求模板上下文处理器，该处理器添加了要在模板中使用的请求。

https://docs.djangoproject.com/en/2.2/topics/templates/#configuration https://docs.djangoproject.com/en/2.2/howto/custom-template-tags/#simple-tags

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.template.context_processors.tz',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

访问上下文

DEFAULT_C_CLASS = Car

@register.simple_tag(name=CAR_TEMPLATE_TAG_NAME, takes_context=True)
def g_c(context, session_key=None, c_class=None):
    request = context['request']
    c_class = c_class or DEFAULT_C_CLASS
    session_key = session_key or request.session.session_key

    # Note this class __init__ should return a fragment.
    return c_class(request, session_key=session_key)

base.html

{% load my_custom_tag %} 

{% g_c as car %}

您还可以直接在模板中传递请求对象

@register.simple_tag(name='g_c')
def g_c(request, session_key=None, c_class=None):
    c_class = c_class or DEFAULT_C_CLASS
    session_key = session_key or request.session.session_key

    # Note this class __init__ should return a fragment.
    return c_class(request, session_key=session_key)

base.html

 {% load my_custom_tag %} 

 {% g_c request as car %}