Django 视图有一个问题，不允许所有上下文变量出现在模板中

Question

我制作了一个滑块模型，其中包含 3 张图像和与之相关的文本，可以在轮播中滑动

我的问题是我希望这些图像按照模型分配的顺序显示，但只出现一个。

如果我删除{% if sliders %}{% for slider in sliders %}则仅显示最新图像，因为在视图中按.latest('timestamp')过滤

我还尝试将视图中的.latest('timestamp')替换为.all()它仍然不起作用

这是模型：

class Slider(models.Model):
title = models.CharField(max_length=60)
image = models.ImageField(blank=False, upload_to='Marketing')
order = models.IntegerField(default=0)
header_text = models.CharField(max_length=120, null=True, blank=True)
middle_text = models.CharField(max_length=120, null=True, blank=True)
footer_text = models.CharField(max_length=120, null=True, blank=True)
button_text = models.CharField(max_length=120, null=True, blank=True)
active = models.BooleanField(default=False)
timestamp = models.DateTimeField(auto_now_add=True, auto_now=False)
class Meta:
ordering = ['order']
def __str__(self):
return self.title
def get_image_url(self):
return "%s/%s" % (settings.MEDIA_URL, self.image)

这是视图：

class HomeView(ListView):
model = Item
paginate_by = 10
template_name = "home.html"
def get_context_data(self, **kwargs):
context = super(HomeView, self).get_context_data(**kwargs)
try:
context['marketing_message'] = MarketingMessage.objects.filter(
active=True).latest('timestamp')
except MarketingMessage.DoesNotExist:
context['marketing_message'] = None
try:
context['slider'] = Slider.objects.filter(
active=True).latest('timestamp')
except Slider.DoesNotExist:
context['slider'] = None
return context

这是模板：

{% if slider %}
{% for slider in sliders %}
<div class="carousel-item {% if forloop.first %} active {% endif %}">
<div class="view" style="background-image: url('{{ slider.get_image_url }}'); background-repeat: no-repeat; background-size: cover;">
<div class="mask rgba-black-strong d-flex justify-content-center align-items-center">
<div class="text-center white-text mx-5 wow fadeIn">
<h1 class="mb-4">
{% if slider.header_text %}
<strong>{{ slider.header_text }}</strong>
{% endif %}
</h1>
<p>
{% if slider.middle_text %}
<strong>{{ slider.middle_text }}</strong>
{% endif %}
</p>
<p class="mb-4 d-none d-md-block">
{% if slider.footer_text %}
<strong>{{ slider.footer_text }}
</strong>
{% endif %}
</p>
{% if slider.button_text %}                            
<a target="_blank" href="" class="btn btn-outline-white btn-lg">
{{ slider.button_text }}
<i class="fas fa-graduation-cap ml-2"></i>
</a>
{% endif %}
</div>
</div>
</div>
</div>
{% endfor %} 
{% endif %}

Answer 1

进行以下更改

views.py

class HomeView(ListView):
model = Item
paginate_by = 10
template_name = "home.html"
def get_context_data(self, **kwargs):
context = super(HomeView, self).get_context_data(**kwargs)
try:
context['marketing_message'] = MarketingMessage.objects.filter(active=True).latest('timestamp')
except MarketingMessage.DoesNotExist:
context['marketing_message'] = None
try:
context['sliders'] = Slider.objects.filter(active=True).order_by('timestamp')
except Slider.DoesNotExist:
context['sliders'] = None
return context

模板

{% if sliders %}
{% for slider in sliders %}
#Your html code
{% endfor %}
{% endif %}

Answer 2

您已在views.py中声明了context['slider']，而在模板中将其称为sliders。

现在您将无法循环，因为它只调用一个对象，因此views.py进行以下更改：

context['slider'] = Slider.objects.filter(active=True).latest('timestamp')

自

context['slider'] = Slider.objects.filter(active=True)