检查Django模板中是否存在模板 [英] Check if a template exists within a Django template

问题描述

在将Django模板包含在Django模板中之前，是否有一个开箱即用的方式来检查模板是否存在？替代方案也是受欢迎的，但由于特定情况，其中一些将不起作用。

Is there an out-of-the-box way of checking if a template exists before including it in a Django template? Alternatives are welcome too but some of them would not work due to the particular circumstances.

例如，这里有一个略有不同的问题的答案。这不是我要找的：
如何检查Django中是否存在模板？

For example, here's an answer to a slightly different question. This is not what I'm looking for: How to check if a template exists in Django?

推荐答案

假设包含如果你传递一个坏的模板引用不会炸毁，那可能是最好的方法。另一种选择是创建一个模板标签，它基本上是在你提到的链接中进行检查。

Assuming include doesn't blow up if you pass it a bad template reference, that's probably the best way to go. Your other alternative would be to create a template tag that essentially does the checks in the link you mentioned.

非常基本的实现：

from django import template

register = template.Library()

@register.simple_tag
def template_exists(template_name):
    try:
        django.template.loader.get_template(template_name)
        return "Template exists"
    except template.TemplateDoesNotExist:
        return "Template doesn't exist"

在您的模板中：

{% template_exists 'someapp/sometemplate.html' %}

那个标签并不是那么有用，所以你可能想要创建一个实际上添加一个变量到上下文中的变量，然后你可以检查一个if语句或者什么不是。

That tag isn't really all that useful, so you'd probably want to create one that actually adds a variable to the context, which you could then check in an if statement or what not.

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