Django:上下文处理器未在登录页面上运行? [英] Django: Context processor not being run on login page?

问题描述

我创建了一个上下文处理器，旨在将某个变量传递给要加载的任何模板.

I have created a context processor which aims to pass a certain variable to any template that gets loaded.

这是我定义上下文处理器的方式:

This is how I have defined my context processor:

from django.conf import settings

def theme(request):
    return {'custom_theme': getattr(settings, "CUSTOM_THEME", "default")}

这是我将上下文处理器包含在设置文件中的方式:

This is how I have included my context processor in the settings file:

TEMPLATES = [{
    'BACKEND': 'django.template.backends.django.DjangoTemplates',
    'APP_DIRS': True,
    'DIRS': [
        normpath(join(PROJECT_PATH, 'templates')),
    ],
    'OPTIONS': {
        'context_processors': {
            'django.template.context_processors.request',
            'django.template.context_processors.media',
            'django.contrib.auth.context_processors.auth',
            'myapp.context_processor.theme',
        },
        'debug': False,
    }
}]

但是，由于某些原因，它并不总是被执行，主要是在登录页面中.

However, for some reason, it is not always being executed, mainly in the login page.

这是处理登录URL并返回'TemplateResponse`的视图:

This is the view that handles the login URL and return a 'TemplateResponse`:

@never_cache
@sensitive_post_parameters('password')
@csrf_protect
def custom_login(request):

    redirect_field_name = 'next'
    redirect_to = request.POST.get(redirect_field_name,
                                   request.GET.get(redirect_field_name, ''))

    if request.method == "POST":
        form = AuthenticationForm(request, data=request.POST)
        if form.is_valid():

            # Ensure the user-originating redirection url is safe.
            if not is_safe_url(url=redirect_to, host=request.get_host()):
                redirect_to = resolve_url(settings.LOGIN_REDIRECT_URL)

            # Okay, security check complete. Log the user in.
            auth_login(request, form.get_user())

            if getattr(settings, 'CHECK_PERMISSIONS_ON_CMDB', False):
                logger.info('Checking permissions on CMDB.')
                auth_cmdb_user_realms(form.get_user())

            return HttpResponseRedirect(redirect_to)
    else:
        form = AuthenticationForm(request)

    context = {
        'form': form,
        'version': get_project_version(),
        redirect_field_name: redirect_to,
    }

    if hasattr(settings, "CUSTOM_THEME"):
        login_template = 'custom_auth/themes/{}/login.html'.\
             format(settings.CUSTOM_THEME)
    else:
        login_template = 'custom_auth/themes/default/login.html'

    return TemplateResponse(request, login_template, context)

由于未运行上下文处理器，因此未在上下文中插入变量ustom_theme`，并且出现以下错误:

Since the context processor is not being run, the variable ustom_theme` is not being inserted in the context and I get the following error:

VariableDoesNotExist: Failed lookup for key [custom_theme] in u"[{'False': False, 'None': None, 'True': True, 'compressed': {'name': None}}]"

奇怪的是，有时上下文处理器正在执行.

The strange thing is that sometimes the context processor is being executed.

有人知道尝试加载登录页面时为什么没有运行上下文处理器吗?

Does anybody have any idea why te context processor is not being run when trying to load the login page?

推荐答案

如果不调用上下文处理器，则不使用上下文处理器.

Context processors is not used if you doesn't call it.

漫长的路途:

return render_to_response("my_app/my_template.html", {'some_var': 'foo'},
                           context_instance=RequestContext(request))

短路径:

from django.shortcuts import render

def some_view(request):
   ...Do something....
   return render(request, "MyTemplate.html",{})

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