减去模板中的两个字段 [英] Subtracting two fields in a template

问题描述

我试图循环访问模板中的数据库中的对象，我想显示的一个是表中两个字段的区别。有没有一个干净的方式来做到这一点：

I'm trying to loop through objects from my database in the template and one of the things I want to display is the difference between two of the fields in the table. Is there a clean way to do this:

{% for game in games %}
<tr>
    <td width=100><p>{{ game.name }} </p></td>
    <td width=300><p>{{ game.campaign }} </p></td>
    <td width=90><p>{{ game.num_Players }} </p></td>
    <td width=90><p>{{ game.num_Players - game.accepted_Characters }}</p></td>
    <td width=90><p>{{ game.standing_Requests }}</p></td>
</tr>
{% endfor %}

？哪里游戏是一个具有所有这些字段的表对象。

? Where game is a table object with all those fields.

推荐答案

Django模板被设计为不做计算。您应该在视图中调整游戏列表，然后将其显示在模板中：

Django templates are designed not to do computation. You should adjust your games list in the view, then display it in the template:

# views.py
for game in games:
    game.chars_diff = game.num_Players - game.accepted_Characters


# template.html
<td><p>{{ game.chars_diff }}</p></td>

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