Twig 异常，因为在测试值是否为空时为空

在数据库中，我有一个可为空的列。当我渲染我的树枝模型时，空值会引发异常。正常。

但是，当我测试值是否为 null 时，它也会引发异常......因为该值为空。

我的树枝文件中有问题的部分：

{% if musicien.photo is null %}
    <td><img class="img-vignette" src="data:image/jpeg;base64,{{ musicien.photo }}"/></td>
{% else %}
    <td><img class="img-vignette" src="data:image/jpeg;base64,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"/></td>
{% endif %}

和例外：

呈现
模板期间引发异常（"警告：stream_get_contents（）期望参数 1 是资源，空给定"）。

我的索引功能：

public function index(): Response
{
    if(isset($_POST['search'])){
        $search = $_POST['search'].'%';
    }else{
        $search = '%';
    }
    $musiciens = $this->getDoctrine()
    ->getRepository(Musicien::class)
    ->createQueryBuilder('m')
    ->where('m.nomMusicien LIKE :search')
    ->setParameter('search', $search)
    ->getQuery()
    ->getResult();
    return $this->render('musicien/index.html.twig', array(
        'musiciens' => $musiciens,
    ));
}

抛出异常的是{% if musicien.photo is null %}行。如果此值为空，我只想显示默认值。

而不是：

{% if musicien.photo is null %}
  <td>
    <img class="img-vignette" src="data:image/jpeg;base64,{{ musicien.photo }}"/>
  </td>
{% else %}
...

尝试：

{% if musicien.photo is null %}
  <td>
    <img class="img-vignette" src="some_default_photo_because_musicien_deosnt_have_one"/>
  </td>
{% else %}
...

现在，您基本上正在检查照片是否为空，然后尝试打印。

请不要在Symfony中使用isset($_POST['....'])，SymfonyComponentHttpFoundationRequest类就是为了这个。
使用单独的 QueryBuilder，将其放在AppRepositoryMusicienRepository

我认为这可以帮助您

控制器的 index（）操作

public function index(MusicienRepository $musicienRepository, Request $request): Response 
{
    // you can use $search = ($request->request->get('search')) ? $request->request->get('search') . '%' : '%';*/
    // But let's write something cool
    $search = $request->request->get('search');
    return $this->render('musicien/index.html.twig', [
        'musiciens ' => $musicienRepository->findLike($search),
    ]);
}

您的应用程序\存储库\音乐存储库

public function findLike($search)
{
    return $this->createQueryBuilder('m')
        ->andWhere('m.nomMusicien LIKE :search')
        ->setParameter('search', '%'.$search.'%')
        ->getQuery()
        ->getResult()
    ;
}

{% if variable is null %}不需要测试给定变量是否为 null，只需使用 {% if variable %} 即可。

那么你的索引.html.twig 必须是

{% set photo = (musicien.photo) ? musicien.photo : 'your_default_photo' %}
<td><img class="img-vignette" src="data:image/jpeg;base64,{{ photo }}"/></td>

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