twig，不能循环变量名调用的散列

Question

为什么这不起作用：

{% set relations = [{'cat':'friends','foo':'bar1'},{'cat':'enemies','foo':bar2},....] %}
{% set friends = [{'firstName':'John', 'lastName':'Goodman'},....] %}
{% set enemies = [{'firstName':'Ron', 'lastName':'Badguy'},....] %}

{% for relCat in relations %}
    {% set list = relCat.cat %}
    {% for person in list %}
        {{ person.firstName }}
    {% endfor %} 
{% endfor %}

我承认我对 twig 很陌生，所以我真的搜索了又搜索，但找不到解决我的问题的方法（我认为是微不足道的）....

我希望有人能帮忙 - 我为此失去了所有的头发，谢谢，鲁道夫

Answer 1

变量的顺序很重要所以首先：敌人和朋友：

{% set friends = [{'firstName':'John', 'lastName':'Goodman'}] %}
{% set enemies = [{'firstName':'Ron', 'lastName':'Badguy'}] %}

然后设置关系：再次friends不是'friends'，第一个是变量，第二个是字符串：

{% set relations = [{'cat':friends,'foo':'bar1'},{'cat':enemies,'foo':bar2}] %}

{% for relCat in relations %}
    {% set list = relCat.cat %}
    {% for person in list %}
        {{ person.firstName }}
    {% endfor %} 
{% endfor %}

这应该有效

见fiddle

Answer 2

如果您真的需要保留字符串，您也可以使用_context变量：

{% set relations = [{'cat':'friends','foo':'bar1'},{'cat':'enemies','foo':bar2}] %}
{% set friends = [{'firstName':'John', 'lastName':'Goodman'}] %}
{% set enemies = [{'firstName':'Ron', 'lastName':'Badguy'}] %}

{% for relCat in relations %}
    {% set list = _context[relCat.cat] %} {# <--- here #}
    {% for person in list %}
        {{ person.firstName }}
    {% endfor %} 
{% endfor %}

见fiddle

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