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Home Backend Development PHP Tutorial Symfony2 oneToMany 问题!

Symfony2 oneToMany 问题!

Jun 06, 2016 pm 08:19 PM
php symfony

现在有两张表,category 和 article。

category:

/**
 * @Mapping\Entity
 * @Mapping\Table(name="category")
 */
class Category
{
    /**
     * @Mapping\Id
     * @Mapping\Column(type="integer")
     * @Mapping\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @Mapping\OneToMany(targetEntity="Article", mappedBy="category")
     */
    protected $articles;

    // ...
}
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article:

<code>/**
 * @Mapping\Entity
 * @Mapping\Table(name="article")
 */
class Article
{
    /**
     * @Mapping\Id
     * @Mapping\Column(type="integer")
     * @Mapping\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @Mapping\ManyToOne(targetEntity="Category", inversedBy="articles")
     * @Mapping\JoinColumn(name="categoryid", referencedColumnName="id")
     */
    protected $category;
    
    /**
     * @Mapping\Column(type="string", columnDefinition="enum('published', 'draft')")
     */
    protected $status;

    // ...
}</code>
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我的问题是, $category->getArticles() 方法可以获取指定分类下的 articles,但是,如果我只想获取 status="published" 时怎么办呢?我看过文档,oneToMany 中不能设定条件

同时,在 twig 中使用 category.articles|length 来显示指定分类下的文章数,也只能返回全部的文章,这种场景怎么写呢?。

另外,我现在在 CategoryRepository 中使用 JOIN 加上条件查询出来,但在 twig 中显示出来的结果就还是忽略了 status 条件:

return $this->createQueryBuilder('c')
     ->leftJoin('c.articles', 'a', 'WITH', 'a.status = :status')
     ->groupBy('c.id')
     ->setParameter('status', 'published')
     ->getQuery()
     ->getResult();
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回复内容:

现在有两张表,category 和 article。

category:

/**
 * @Mapping\Entity
 * @Mapping\Table(name="category")
 */
class Category
{
    /**
     * @Mapping\Id
     * @Mapping\Column(type="integer")
     * @Mapping\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @Mapping\OneToMany(targetEntity="Article", mappedBy="category")
     */
    protected $articles;

    // ...
}
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article:

<code>/**
 * @Mapping\Entity
 * @Mapping\Table(name="article")
 */
class Article
{
    /**
     * @Mapping\Id
     * @Mapping\Column(type="integer")
     * @Mapping\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @Mapping\ManyToOne(targetEntity="Category", inversedBy="articles")
     * @Mapping\JoinColumn(name="categoryid", referencedColumnName="id")
     */
    protected $category;
    
    /**
     * @Mapping\Column(type="string", columnDefinition="enum('published', 'draft')")
     */
    protected $status;

    // ...
}</code>
Copy after login
Copy after login

我的问题是, $category->getArticles() 方法可以获取指定分类下的 articles,但是,如果我只想获取 status="published" 时怎么办呢?我看过文档,oneToMany 中不能设定条件

同时,在 twig 中使用 category.articles|length 来显示指定分类下的文章数,也只能返回全部的文章,这种场景怎么写呢?。

另外,我现在在 CategoryRepository 中使用 JOIN 加上条件查询出来,但在 twig 中显示出来的结果就还是忽略了 status 条件:

return $this->createQueryBuilder('c')
     ->leftJoin('c.articles', 'a', 'WITH', 'a.status = :status')
     ->groupBy('c.id')
     ->setParameter('status', 'published')
     ->getQuery()
     ->getResult();
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class Category
{
...
public function getPublishedArticles()
{

<code>$result = new ArrayCollection();

foreach ($this->articles as $article) {
    if ($article->getStatus() == 'published') {
        $result[] = $article;
    }
}

return $result;</code>
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}

从articles的角度解决问题。

在controller里面

<code>$articles = $this
    ->getDoctrine()
    ->getRepository('Article')
    ->findBy([
        'category' => $category,
        'status'   => 'published',    
    ]);</code>
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然后view里面就可以用articles|length了。

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