Django视图没有将模型返回到模板

Question

请注意，我是 Django 新手。我创建了一个简单的配置模型，我想用它在我的站点上设置一些全局设置。现在我只创建了一个替换主 css 文件的主题切换设置，但我无法将它加载到我的登录模板上。虽然在索引上工作正常。请帮忙！

观看次数：

from django.shortcuts import render, HttpResponseRedirect
from django.contrib.auth.decorators import login_required
from django.contrib.auth import login, logout
from .forms import LoginForm
from .models import Configuration


def get_theme():
    theme_name = Configuration.objects.only('theme_name').get().theme_name
    context = {'theme_name': theme_name}
    return context


def login_view(request):
    form = LoginForm(request.POST or None)
    if request.POST and form.is_valid():
        user = form.login(request)
        if user:
            login(request, user)
            return HttpResponseRedirect('index')  # Redirect to a success page.
    theme_name = get_theme()
    context = theme_name.update({'login_form': form})
    return render(request, 'registration/login.html', context)


def logout_user(request):
    logout(request)
    return HttpResponseRedirect('registration/login.html')


@login_required(login_url='login/')
def index(request):
    theme_name = get_theme()
    return render(request, 'base.html', theme_name)

Login.html 上的模板：

{% compress css %}
    <link href="{% static 'base/css/style-'%}{{ theme_name }}.css" rel="stylesheet" type="text/css">
{% endcompress %}

Base.html 上的模板（工作）：

{% compress css %}
    <link href="{% static 'base/css/style-'%}{{ theme_name }}.css" rel="stylesheet" type="text/css">
    <link href="{% static 'base/css/sidebar-menu.css' %}" rel="stylesheet" type="text/css">
{% endcompress %}

注意：我没有在我的登录页面上加载 Base.html，因为用户需要先登录才能看到 base.html 上的任何内容。如果我做错了，请告诉我。

提前感谢您的帮助。

编辑forms.py：

class LoginForm(forms.Form):
    username = forms.CharField(max_length=255, required=True)
    password = forms.CharField(widget=forms.PasswordInput, required=True)

    def clean(self):
        username = self.cleaned_data.get('username')
        password = self.cleaned_data.get('password')
        user = authenticate(username=username, password=password)
        if not user or not user.is_active:
            raise forms.ValidationError("Sorry, that login was invalid. Please try again.")
        return self.cleaned_data

    def login(self, request):
        username = self.cleaned_data.get('username')
        password = self.cleaned_data.get('password')
        user = authenticate(username=username, password=password)
        return user

Answer 1

虽然您将主题错误地传递到上下文中，但您似乎打算将其包含在每个视图中，因此最好将其添加为上下文处理器

def theme_name_processor(request):

    theme_name = Configuration.objects.only('theme_name').get().theme_name
    context = {'theme_name': theme_name}
    return context

然后将对此的引用添加到您的设置中的上下文处理器列表中。

见Writing your own context processors

Answer 2

您没有正确传递主题。它需要与表单在同一个字典中。

return render(request, 'registration/login.html', {'login_form': form, 'theme_name': theme_name})

Answer 3

theme_name 在您传递给login_view 模板的上下文字典中缺失。你路过：{'login_form': form}。

您可以使用其他数据扩展get_theme() 提供的字典，反之亦然，或者您可以从两者创建一个新字典，并将其传递给模板。

def login_view(request):
    form = LoginForm(request.POST or None)
    if request.POST and form.is_valid():
        user = form.login(request)
        if user:
            login(request, user)
            return HttpResponseRedirect('index')  # Redirect to a success page.
    theme_name = get_theme()
    context = theme_name.update({'login_form': form})
    return render(request, 'registration/login.html', context)