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Accepted
Mathieu Dhondt
Asked: 2023-10-29 15:43:19 +0800 CST

如何获取 Django 模板中组中对象的“总体”计数器？

  • 772

我正在使用 Django 的重新分组模板标签来对一系列对象进行分组。假设这些是对象：

cities = [
    {"name": "Mumbai", "population": "19,000,000", "country": "India"},
    {"name": "Calcutta", "population": "15,000,000", "country": "India"},
    {"name": "New York", "population": "20,000,000", "country": "USA"},
    {"name": "Chicago", "population": "7,000,000", "country": "USA"},
    {"name": "Tokyo", "population": "33,000,000", "country": "Japan"},
]

在我的模板中，我将它们分组如下：

{% regroup cities by country as country_list %}

<ul>
{% for country in country_list %}
    <li>{{ country.grouper }}
    <ul>
        {% for city in country.list %}
          <li>{{ city.name }}: {{ city.population }}</li>
        {% endfor %}
    </ul>
    </li>
{% endfor %}
</ul>

这导致

India
    Mumbai: 19,000,000
    Calcutta: 15,000,000
USA
    New York: 20,000,000
    Chicago: 7,000,000
Japan
    Tokyo: 33,000,000

我想显示每个对象的“总体”索引，使其看起来像这样：

India
    1: Mumbai: 19,000,000
    2: Calcutta: 15,000,000
USA
    3: New York: 20,000,000
    4: Chicago: 7,000,000
Japan
    5: Tokyo: 33,000,000

我不是在要求一个 HTML 解决方案；我是在要求一个 HTML 解决方案。我的用例是一系列分组问题，我想添加一个问题计数器。

有没有办法在模板中执行此操作，或者我应该在我的视图中编写必要的代码？

django

1 个回答

  1. Best Answer

    我认为您需要在视图中添加索引，Django 有意限制其模板语言中的功能，以阻止直接在模板中包含大量逻辑。我建议按照建议的方法解决此问题：

    # views.py
from django.shortcuts import render

def your_view(request):
    cities = [
        {"name": "Mumbai", "population": "19,000,000", "country": "India"},
        {"name": "Calcutta", "population": "15,000,000", "country": "India"},
        {"name": "New York", "population": "20,000,000", "country": "USA"},
        {"name": "Chicago", "population": "7,000,000", "country": "USA"},
        {"name": "Tokyo", "population": "33,000,000", "country": "Japan"},
    ]

    # Add an index to each city
    for index, city in enumerate(cities, start=1):
        city['index'] = index

    return render(request, 'your_template.html', {'cities': cities})

    然后在您的模板中，您可以使用索引属性：

    {% regroup cities by country as country_list %}

<ul>
    {% for country in country_list %}
        <li>{{ country.grouper }}
        <ul>
            {% for city in country.list %}
                {% with counter=counter|add:1 %}
                 <li>{{ city.index }}: {{ city.name }}: {{ city.population }}</li>
                {% endwith %}
            {% endfor %}
        </ul>
        </li>
    {% endfor %}
</ul>
    • 1

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