如何确定键是否是对象(树枝)? [英] How can I determine if key is an object (twig)?

问题描述

我想确定我的密钥是否是一个对象:

I want to determine if my key is an object:

  {% for key in columns %}
      {% if key is object %}
        This is an object
      {% else %}
       This in not an object
      {% endif %}
  {% endfor %}

但我收到错误消息:

未知的对象"测试.

推荐答案

您可以创建自己的 Twig 扩展.我看到您已经用 Symfony 标记了您的问题，因此假设您在 Symfony 中使用 Twig，您可以按照本教程进行操作:

You can create your own Twig extension. I see you've tagged your question with Symfony so assuming you use Twig in Symfony, you can follow this tutorial:

https://symfony.com/doc/3.4/templating/twig_extension.html

你需要做的是基于这个例子添加新的TwigTest:

What you need to do is add new TwigTest based on this example:

https://twig.symfony.com/doc/2.x/advanced.html#tests

你应该得到这样的结果:

You should end up with something like this:

// src/AppBundle/Twig/AppExtension.php
namespace AppBundle\Twig;

use Twig\Extension\AbstractExtension;
use Twig\TwigTest;

class AppExtension extends AbstractExtension
{
    public function getTests()
    {
        return array(
            new TwigTest('object', array($this, 'isObject')),
        );
    }

    public function isObject($object)
    {
        return is_object($object);
    }
}

上面的代码没有经过测试，但应该可以正常工作.

Code above is not tested, but should work fine.

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