symfony 中的类别树问题

Question

我在 symfony 5 中创建了一个类别树

我关注了：

Category.php实体：

/**
 * @ORM\Id()
 * @ORM\GeneratedValue()
 * @ORM\Column(type="integer")
 */
private $id;

/**
 * @ORM\Column(type="string", length=255)
 */
private $name;

/**
 * @ORM\ManyToOne(targetEntity="App\Entity\Category", inversedBy="children")
 */
private $parent;

/**
 * @ORM\OneToMany(targetEntity="App\Entity\Category", mappedBy="parent")
 */
private $children;

public function __construct()
{
    $this->children = new ArrayCollection();
}

public function getId(): ?int
{
    return $this->id;
}

public function getName(): ?string
{
    return $this->name;
}

public function setName(string $name): self
{
    $this->name = $name;

    return $this;
}

public function getParent(): ?self
{
    return $this->parent;
}

public function setParent(?self $parent): self
{
    $this->parent = $parent;

    return $this;
}

/**
 * @return Collection|self[]
 */
public function getChildren(): Collection
{
    return $this->children;
}

public function addChild(self $child): self
{
    if (!$this->children->contains($child)) {
        $this->children[] = $child;
        $child->setParent($this);
    }

    return $this;
}

CategoryReponsitory.php

public function getAllCategory()
{
    $query = $this->createQueryBuilder('c')
        ->where('c.parent IS NULL');

    return $query->getQuery()->getResult();
}

Controller.php

public function index(CategoryRepository $categoryRepository): Response
{
    return $this->render('category/index.html.twig', [
        'categories' => $categoryRepository->getAllCategory(),
    ]);
}

和树枝模板文件index.html.twig

{% macro menu_categories(categories) %}
    {% import _self as macros %}
    {% for category in categories %}
        <li>
            <a href="cate/{{ category.id }}">{{ category.name }}</a>
            {% if category.children %}
                <ul class="children">
                    {{ macros.menu_categories(category.children) }}
                </ul>
            {% endif %}
        </li>
    {% endfor %}
{% endmacro %}

<ul class="menu-category">
    {{ _self.menu_categories(categories) }}
</ul>

渲染正确，但是如果 children 没有任何 children，它仍然会渲染 html，如下图所示：

出于某种原因，我不想要它。我该如何解决。谢谢。

Answer 1

集合的行为似乎与数组不同。因为 children 是一个 ArrayCollection，它总是被设置。您应该检查它是否包含元素。

{% if category.children is not empty %}
    <ul class="children">
        {{ macros.menu_categories(category.children) }}
    </ul>
{% endif %}

symfony 中的类别树问题

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