如何在django模板中显示与带注释的queryset链接的views.py变量？

Question

如何在django模板中显示与带注释的queryset链接的views.py变量？我知道带注释的queryset在打印出来时返回正确的数据，但是不知怎么的，模板for循环并没有检索html页面上的数据。有人能告诉我如何解决这个问题吗？谢谢。

VIEWS.PY

from django.shortcuts import render
from django.views.generic import (TemplateView,ListView,
                              DetailView,CreateView,
                              UpdateView,DeleteView)
from django.urls import reverse_lazy
from myapp.models import Pastry
from myapp.forms import PastryForm
from django.db.models import F

这一行ps = Pastry.objects.values('pastry').annotate(total=Count('pastry'))返回正确的数据：

{'pastry': 'Brownie', 'total': 1}
{'pastry': 'Cake', 'total': 1}
{'pastry': 'Cupcake', 'total': 1}
{'pastry': 'Fruit Tart', 'total': 1}
{'pastry': 'Muffin', 'total': 2}


class PollsListView(ListView):
    model = Pastry

    def get_queryset(self):
        return Pastry.objects.all()

class PollsDetailView(DetailView):
    model = Pastry

class PollsCreateView(CreateView):
    success_url = reverse_lazy('pastry_list')
    form_class = PastryForm
    model = Pastry

class PollsUpdateView(UpdateView):
    success_url = reverse_lazy('pastry_list')
    form_class = PastryForm
    model = Pastry

class PollsDeleteView(DeleteView):
    model = Pastry
    success_url = reverse_lazy('pastry_list')

pastry_list.html (模板)

{% extends "base.html" %}
{% block content %}
<div class="jumbotron">

<a href="{% url 'pastry_new' %}">New Poll</a>
<h1>Voting for the favorite pastry</h1>

Somehow this code here is not displaying any data.
{% for p in ps %}
 {% for k, v in p.items %}
   {{k}}{{v}}
 {% endfor %}
{% endfor %}

{% for pastry in pastry_list %}
    <div class="pastry">
        <h3><a href="{% url 'pastry_detail' pk=pastry.pk %}">
  {{ pastry.pastry }}</a></h3>
    </div>
  {% endfor %}

 </div>

 {% endblock %}

Answer 1

更多信息可以在文档中找到。

基本上，您可以通过get_context_data()方法向模板发送更多变量。

示例：

class PollsListView(ListView):
    model = Pastry

    def get_queryset(self):
        return Pastry.objects.all()

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['ps'] =  = Pastry.objects.values('pastry').annotate(total=Count('pastry'))
        return context

使用get_context-data()，您的变量ps在模板pastry_list.html中可用。