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我正在使用一个名为 FilePond 的插件，以便在使用 VichUploaderBundle 上传图像时获得更好的外观。因此，为了避免捆绑包的默认 form_row 模板，我制作了一个自定义模板：

//template/forms/upload_image.html.twig
{% block _image_file_row %}
    <input type="file" class="filepond-initialise" name="image[file][file]" required="required" accept=".gif, .jpg, .png">
{% endblock %}

然后我在页面中渲染模板：

{% form_theme form 'forms/upload_image.html.twig' %}
{{ form_start(form) }}
    {{ form_row(form.file) }}
    <h3>Tags</h3>
        <ul class="tags list-inline" data-prototype="{{ form_widget(form.tags.vars.prototype.name)|e('html_attr') }}">
        {% for tag in form.tags %}
            <li>{{ form_row(tag.name) }}</li>
        {% endfor %}
    </ul>
    <button class="btn btn-success btn-block" type="submit">Upload</button>
    <input type="hidden" name="token" value="{{ csrf_token('image-upload') }}">
{{ form_end(form, {'render_rest': false}) }}

这是控制器中的操作：

public function upload(Request $request):Response
    {
        $image = new Image();
        $form = $this->createForm(ImageType::class, $image);
        $token = $request->request->get('token');
        $form->handleRequest($request);

        if ($form->isSubmitted() && $this->isCsrfTokenValid('image-upload', $token)) {
            dump($image);
            dump($form->getData());
            $this->em->persist($image);
            $this->em->flush();
            return $this->redirectToRoute('admin_image_index');
        }

        return $this->render('admin/image/upload.html.twig', array(
            'form' => $form->createView()
        ));
    }

文件输入的内容似乎没有在表单提交中发送的问题。我收到名称属性 null 的错误：

An exception occurred while executing 'INSERT INTO image (name, updated_at) VALUES (?, ?)' with params [null, "2019-05-14 22:42:18"]:

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'name' cannot be null

以及 $image 变量和 $form-getData() 的转储如下：

Image {#496 ▼
  -id: null
  -file: null
  -name: null
  -updatedAt: DateTime @1557873995 {#497 ▼
    date: 2019-05-14 22:46:35.496026 UTC (+00:00)
  }
  -tags: ArrayCollection {#498 ▼
    -elements: array:3 [▼
      0 => Tag {#901 ▼
        -id: null
        -name: "sport"
        -images: ArrayCollection {#902 ▶}
      }
      1 => Tag {#878 ▼
        -id: null
        -name: "nature"
        -images: ArrayCollection {#905 ▶}
      }
      2 => Tag {#906 ▼
        -id: null
        -name: "fashion"
        -images: ArrayCollection {#908 ▶}
      }
    ]
  }
}

虽然标签输入工作正常，但这意味着问题出在文件输入上。

这是 ImageType.php 中的构建器，其余的是默认情况下：

$builder
            ->add('file', VichImageType::class)
            ->add('tags', CollectionType::class, [
                'entry_type' => TagType::class,
                'entry_options' => ['label' => false],
                'allow_add' => true,
                'allow_delete' => true,
                'by_reference' => false,
            ])
        ;
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