Django - 通过模板中的某个字段对查询进行分组 [英] Django - Grouping querysets by a certain field in template
问题描述
我有一个表事件
,按字段日期
。
我想打印出模板中的事件,但是为每个日期使用单独的div,例如:
< div class =content>
< h1> 12月30日< / h1>
<! - div为12月30日的事件1>
<! - div为12月30日的事件2 - >
< / div>
< div class =content>
< h1> 12月31日< / h1>
<! - div为12月31日的事件1>
<! - div为12月31日的活动2>
<! - div为12月31日的事件3>
< / div>
我该怎么做?
我目前的解决方案是将事件对象放在字典中,并将日期作为关键字。这有订购问题,并且效率低下。
查看:
events = Event.objects.select_related()。all()
events_dict = {}
事件中的事件:
date = event.date.strftime('%d %B%Y')
如果date_dict中的日期:
events_dict [date] .append(event)
else:
events_dict [date] = [event]
模板:
{%for date,events_dict.items%}中的事件
< div class =content>
< h1> {{date}}< / h1>
{%活动中的事件%}
{%includepartials / event.html%}
{%endfor%}
< / div>
{%endfor%}
重新查找 {%重组%}
标签,这完全符合您的要求。它需要一系列的项目(它必须事先订购,您的是),并通过查找进行查找并对序列进行分组。
查看:
events = Event.objects.select_related.all()
模板:
{%将事件按日期重新排列为events_by_date%}
{%for events in date_by_date%}
< div class =content>
< h1> {{date.grouper | date:d F Y}}< / h1>
{%for date in date.list%}
{%includepartials / event.html%}
{%endfor%}
< / div>
{%endfor%}
(请注意,日期格式字符串不同; 相当于%B
在 strftime
是日期
过滤器的 F
p>
I have a table Events
, ordered by a field date
.
I want to print out the events in the template, but using a separate div for each date, e.g.:
<div class="content">
<h1>December 30th</h1>
<!-- div for Event 1 from December 30th -->
<!-- div for Event 2 from December 30th -->
</div>
<div class="content">
<h1>December 31st</h1>
<!-- div for Event 1 from December 31st -->
<!-- div for Event 2 from December 31st -->
<!-- div for Event 3 from December 31st -->
</div>
How do I do this?
My current solution is to put the Event objects in a dictionary with the date as the key. This has ordering issues and is inelegant and inefficient.
View:
events = Event.objects.select_related().all()
events_dict={}
for event in events:
date=event.date.strftime('%d %B %Y')
if date in events_dict:
events_dict[date].append(event)
else:
events_dict[date] = [event]
Template:
{% for date, events in events_dict.items %}
<div class="content">
<h1>{{date}}</h1>
{% for event in events %}
{% include "partials/event.html" %}
{% endfor %}
</div>
{% endfor %}
You're looking for the {% regroup %}
tag, which does exactly what you want. It takes a sequence of items (it has to be ordered beforehand, which yours is) and a lookup and groups the sequence by that lookup.
view:
events = Event.objects.select_related.all()
template:
{% regroup events by date as events_by_date %}
{% for date in events_by_date %}
<div class="content">
<h1>{{ date.grouper|date:"d F Y" }}</h1>
{% for event in date.list %}
{% include "partials/event.html" %}
{% endfor %}
</div>
{% endfor %}
(Notice that the date format string is different; the equivalent of %B
in strftime
is F
for the date
filter).
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