symfony2 学说中的延迟加载 - Lazy loading in symfony2 doctrine

Lazy loading in symfony2 doctrine

本文关键字：延迟加载 symfony2 | 更新日期: 2023-09-27

我在 Symfony2 框架中使用 Doctrine （v 2.3.23）。我有两个实体：Product 和 Manufacturer 具有一对多的单向关系。实体具有小写字段名称。当我从存储库检索数据并尝试使用以下代码访问延迟加载的对象时：

$repository = $this->getDoctrine ()->getRepository ( 'AtCompDbBundle:Product' );
$result = $repository->findById ( 1);
$x = $result[0]->getManufacturer ()->getName ();

我收到以下错误：

ContextErrorException: Notice: Undefined property: 
Proxies'__CG__'AtComp'DbBundle'Entity'Manufacturer::$Name in C:'project_dir'src'AtComp'DbBundle'Entity'Manufacturer.php line 54

我找到了一个有效的解决方法：将字段名称更改为以大写字母开头。但是有没有办法强制教义代理对象查找以小写字母开头的字段名称？

下面是Product类定义：

/**
 * @ORM'Entity(repositoryClass="AtComp'DbBundle'Repository'ProductRepository")
 * @ORM'Table(name="produkty")
 */
class Product {
    /**
     * @ORM'Column(type="integer", name="prod_id")
     * @ORM'Id
     * @ORM'GeneratedValue(strategy="AUTO")
     */
    protected $id;
    /**
     * @ORM'ManyToOne(targetEntity="Manufacturer")
     * @ORM'JoinColumn(name="prod_producent_id", referencedColumnName="pr_id")
     */
    protected $manufacturer;
    /**
     * Get id
     *
     * @return integer
     */
    public function getId() {
        return $this->id;
    }
    /**
     * Set manufacturer
     *
     * @param 'AtComp'DbBundle'Entity'Manufacturer $manufacturer            
     * @return Product
     */
    public function setManufacturer('AtComp'DbBundle'Entity'Manufacturer $manufacturer = null) {
        $this->manufacturer = $manufacturer;
        return $this;
    }
    /**
     * Get manufacturer
     *
     * @return 'AtComp'DbBundle'Entity'Manufacturer
     */
    public function getManufacturer() {
        return $this->manufacturer;
    }
}

以及制造商类的定义：

/**
 * @ORM'Entity
 * @ORM'Table(name="producent")
 */
class Manufacturer
{
    /**
     * @ORM'Column(type="integer", name="pr_id")
     * @ORM'Id
     * @ORM'GeneratedValue(strategy="AUTO")
     */
    protected $id;
    // CHANGE OF THE DEFINITION OF THIS FIELD INTO 
    //
    // protected $Name;
    //
    // SOLVES THE PROBLEM...
    /**
     * @ORM'Column(type="string", length=100, name="pr_name")
     */
    protected $name;
    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->Id;
    }
    /**
     * Set name
     *
     * @param string $name
     * @return Manufacturer
     */
     public function setName($name)
    {
        $this->Name = $name;
        return $this;
    }
    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->Name;
    }
}

属性名称应为小写，对 set 方法执行相同操作：

/**
 * Get name
 *
 * @return string 
 */
public function getName()
{
    return $this->name;
}