Twig 的工作方式与 php 不同答案

【问题标题】：Twig not working the same as phpTwig 的工作方式与 php 不同
【发布时间】：2016-12-20 14:23:15
【问题描述】：

为什么当我用 php 编写测试时……

foreach ($rounds as $round){
    $assignment = $em->getRepository(‘WorkBundle:Doc’)->findOneBy(array(
        ‘user’ => $user->getId(),
        ’whichRound’ => $round,
    ));

   if (!$assignment){
    echo “assign ”.$round. “ to user”;
   }else{
    echo “already assigned to ”.$round. “ to user”;
   }
 }

return array (
    'user' =>  $user,
    'assignment' => $assignment,
    'rounds' => $rounds,
);

…它工作正常。赋值为null时输出“assign ”.$round. “ to user”;，不为null时输出“already assigned to ”.$round. “ to user”;。

但是，当我使用上面返回的变量进入我的 twig 模板并执行...

{% for round in rounds %}
    {% if assignment is null %}
        <h2>{{ user }} successfully added to {{ round }}</h2>
    {% else %}
        <h2>{{ user }} has already been assigned to the {{ round }}</h2>
    {% endif %}
{% endfor %}

……它不能正常工作？相反，它将输出相同的消息两次……例如，如果第一轮为空，第二轮不为空，它将输出第二条消息{{ user }} has already been assigned to the {{ round }} 两次。

我在搞砸什么？

【问题讨论】：

标签： php for-loop twig logic

【解决方案1】：

当您在代码中执行 foreach 循环时，您每次都在设置 $assignment。当您返回数组时，您只会返回 last 设置 $assignment 的时间。

看起来$rounds 是一个数字数组，您希望将回合与分配结果相关联。基于此，我建议像这样构建一个新数组：

$results = array();

foreach ($rounds as $round) {
    $row = array(
        'round' => $round,
        'assignment' => $em->getRepository('WorkBundle:Doc')->findOneBy(array(
            'user' => $user->getId(),
            'whichRound' => $round,
        ))
    );

    if ($row['assignment']) {
        echo "Already assigned $round to user.";
    } else {
        echo "Assign $round to user.";
    }

    $results[] = $row;
}

return array(
    'user' => $user,
    'results' => $results,
);

您的 Twig 模板将如下所示：

{% for row in results %}
    {% if row.assignment is null %}
        <h2>{{ user }} successfully added to {{ row.round }}</h2>
    {% else %}
        <h2>{{ user }} has already been assigned to the {{ row.round }}</h2>
    {% endif %}
{% endfor %}

【讨论】：