Jinja2:在循环内更改变量的值 [英] Jinja2: Change the value of a variable inside a loop

问题描述

我想在循环内更改在循环外声明的变量的值.但是总是在变化，它将初始值保持在循环之外.

I want to change the value of the variable declared outside the loop within a loop. But always changing, it keeps the initial value outside the loop.

{% set foo = False %}

{% for item in items %}
  {% set foo = True %}
  {% if foo %} Ok(1)! {% endif %}
{% endfor %}

{% if foo %} Ok(2)! {% endif %}

这将呈现:

Ok(1)!

因此，到目前为止发现的唯一(坏)解决方案是:

So the only (bad) solution have found so far was this:

{% set foo = [] %}

{% for item in items %}
  {% if foo.append(True) %} {% endif %}
  {% if foo %} Ok(1)! {% endif %}
{% endfor %}

{% if foo %} Ok(2)! {% endif %}

这将呈现:

Ok(1)!
Ok(2)!

但是，它非常丑陋！还有另一个更优雅的解决方案吗?

But, its is very ugly! Is there another more elegant solution?

推荐答案

也尝试基于字典的方法.似乎不太丑.

Try also dictionary-based approach. It seems to be less ugly.

{% set vars = {'foo': False} %}

{% for item in items %}
  {% if vars.update({'foo': True}) %} {% endif %}
  {% if vars.foo %} Ok(1)! {% endif %}
{% endfor %}

{% if vars.foo %} Ok(2)! {% endif %}

这也会呈现:

Ok(1)!
Ok(2)!

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