我正在尝试过滤单个对象，更具体地说，是今天的条目。然后，我想获取该查询并在模板中显示结果。无论我做什么，我似乎无法让过滤器在模板中显示任何内容。我不确定是否需要在视图，模型或两者中编写查询。我对Django查询的熟悉程度很轻松。关于这个主题的一个很好的资源也非常有用。
我是Django的新手，所以你能提供的任何帮助都会非常感激。
models.py
class Entry(models.Model):
date = models.DateField(blank=True, null=True,)
euros = models.CharField(max_length=500, blank=True, null=True)
comments = models.CharField(max_length=900, blank=True, null=True)
euros_sum = models.DecimalField(max_digits=6, decimal_places=2, blank=True, null=True)
xrate = models.DecimalField(max_digits=6, decimal_places=2, blank=True, null=True)
dollars_sum = models.DecimalField(max_digits=6, decimal_places=2, blank=True, null=True)
daily_savings_dollars = models.DecimalField(max_digits=6, decimal_places=2, blank=True, null=True)
def get_absolute_url(self):
return reverse('argent:detail', kwargs={'pk': self.pk})
views.py：
class IndexView(generic.ListView):
template_name = 'argent/index.html'
context_object_name = 'object_list'
queryset = Entry.objects.all()
filter = Entry.objects.filter(date=today_date)
print(filter)
class DetailView(generic.DetailView):
model = Entry
template_name = 'argent/detail.html'
class EntryCreate(CreateView):
form_class = EntryForm
template_name = 'argent/entry_form.html'
def form_valid(self, form):
return super(EntryCreate, self).form_valid(form)
class EntryUpdate(UpdateView):
model = Entry
form_class = EntryForm
template_name = 'argent/entry_form.html'
def form_valid(self, form):
return super(EntryUpdate, self).form_valid(form)
注1：当我打印“filter =”时，我会在控制台中返回正确的对象。
注意2：我在我的模板中使用了我的“queryset =”并且它可以工作 完全没问题。
模板（index.html的）：
<div class="container" style="font-family: 'Dosis', serif;">
<div class="jumbotron" style="background: #ebebeb">
{% for Entry in filter %}
<h1>Today's Spending</h1>
<div class="container container-fluid" style="margin-left: 30px; margin-right: 30px; font-family: 'Dosis', serif; color: white;">
<div class="container container-fluid">
<table class="table">
<thead>
<tr>
<th colspan="2" style="font-size: large; color: #337ab7; font-weight: bold">{{ first.date }}</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" style="color: #337ab7; font-weight: bold">Receipts:</td>
<td style="color: #FF6F18;"> {{ first.euros }} </td>
</tr>
<tr>
<td align="left" style="color: #337ab7; font-weight: bold">Total Euros Spent:</td>
<td style="color: #FF6F18;">€{{first.euros_sum}}</td>
</tr>
<tr>
<td align="left" style="color: #337ab7; font-weight: bold">Total Dollars Spent:</td>
<td style="color: #FF6F18;">${{first.dollars_sum}}</td>
</tr>
<tr>
<td align="left" style="color: #337ab7; font-weight: bold">Exchange Rate:</td>
<td style="color: #FF6F18;">{{ first.xrate }}</td>
</tr>
<tr>
<td align="left" style="color: #337ab7; font-weight: bold">Daily Savings:</td>
<td style="color: #FF6F18;">
{% if last.daily_savings_dollars > 0 %}
<div class="NegativeSavings" style="font-weight: bold">-
{% else %}
<div class="PositiveSavings" style="font-weight: bold">+
${{ first.daily_savings_dollars }}
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
{% endfor %}
<div class="container container-fluid" style="font-family:'Dosis', serif">
<!-- Entry List -->
<div class="row" style="margin-left: 20px; margin-right: 20px">
<div>
 
</div>
{% if object_list %}
{% for Entry in object_list %}
<div class="col-sm-4 col-lg-3">
<div class="thumbnail" style="background: #ebebeb"; >
<a href="{% url 'argent:detail' Entry.id %}">
<h3 align="center" style="font-weight: bold">{{ Entry.date }}</h3>
</a>
<div class="caption">
<h4 align="center" style="color: #FF6F18">€{{ Entry.euros_sum }}
<!-- View Details -->
<a href="{% url 'argent:detail' Entry.id %}"><button type="button" class="btn btn-link btn-lg">
<span class="glyphicon glyphicon-info-sign" aria-hidden="true"></span>
</button></a>
<!-- Update -->
<a href="{% url 'argent:entry-update' Entry.id %}"><button type="button" class="btn btn-link btn-lg" style="padding: 0%">
<span class="glyphicon glyphicon-pencil" aria-hidden="true"></span>
</button></a></h4>
</div>
</div>
</div>
{% endfor %}
{% endif %}
</div>
</div>
提前感谢您的帮助！
答案 0 :(得分：2)
您不应该在模块级别进行任何数据库交互。您应该覆盖get_queryset（对于将object_list传递给模板的内容）和get_context_data，如果您想要模板上下文中的其他内容，例如过滤的查询集：
from django.utils import timezone
class IndexView(generic.ListView):
template_name = 'argent/index.html'
context_object_name = 'object_list'
def get_queryset(self):
return Entry.objects.all()
def get_context_data(self, **kwargs):
ctx = super(IndexView, self).get_context_data(**kwargs)
ctx['filter'] = Entry.objects.filter(date=timezone.datetime.today())
return ctx
django文档in general及其ListView部分是一个很好的起点。 django tutorial也值得完成。
答案 1 :(得分：1)
修改视图以将其中一个查询集作为上下文传递。
class IndexView(generic.ListView):
template_name = 'argent/index.html'
context_object_name = 'object_list'
#queryset = Entry.objects.all() use the get_queryset method to get this
#filter = Entry.objects.filter(date=today_date) add this using the get_context_data method
def get_context_data(self, **kwargs):
context = super(IndexView, self).get_context_data(**kwargs)
context.update({
'filter': Entry.objects.filter(date=today_date),
})
return context
def get_queryset(self):
return Entry.objects.all()