避免教义返回所有实体 [英] Avoid Doctrine to return all entities

问题描述

使用Symfony2 / doctrine2，当我们使用find（）函数根据所选择的实体获取特定对象（如OneToMany）时，Doctrine返回所有其他对象。

例如：

  $ em = $ this-> get（
'doctrine。 orm.entity_manager'，
 $ request-> getSession（） - > get（'entity_manager'）
）; 
 $ product = $ em-> getRepository（'MyBundle：Product'） - > find（$ id）; 
  

$ product上的结果将是Product对象+其他链接的对象，如（Store，Category， .. / b>

我们如何控制原则来确定我们需要返回哪个对象。

我可以使用Querybuilder，但是我正在查看是否有任何函数都是确定的。

解决方案

返回所有其他对象

这不是它的工作原理，至少默认情况下。

教义使用所谓的延迟加载。

从官方文件，您有以下示例：

 <？php 
 / ** @Entity * / 
 class Article 
 {
 / ** @Id @Column（type =integer）@GeneratedValue * / 
 private $ id; 
 
 / ** @Column（type =string）* / 
 private $ headline; 
 
 / ** @ManyToOne（targetEntity =User）* / 
 private $ author; 
 
 / ** @OneToMany（targetEntity =Comment，mappedBy =article）* / 
 private $ comments; 
 
 public function __construct {
 $ this-> comments = new ArrayCollection（）; 
} 
 
 public function getAuthor（）{return $ this-> author; } 
 public function getComments（）{return $ this-> comments; } 
} 
 
 $ article = $ em-> find（'Article'，1）; 
  

以下说明：

而不是传回一个真正的作者实例和
的集合注释，Doctrine将为您创建代理实例。只有当您
首次访问这些代理时，他们将通过
EntityManager并从数据库加载其状态。

参考： http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/working-with-objects.html#entity-object-graph-traversal

有关主题的更多信息： http://www.doctrine-project.org/blog/doctrine-lazy-loading.html

Using Symfony2 / doctrine2, while we use the find() function to get a specific object based on the entity selected if there are relations (like OneToMany), Doctrine return all other object.

For example :

$em = $this->get(
         'doctrine.orm.entity_manager', 
          $request->getSession()->get('entity_manager')
);
$product = $em->getRepository('MyBundle:Product')->find($id);

The result on $product will be the Product object + other linked objects like (Store, Category, ...etc.)

How can we control doctrine to determinate which object we need to be returned.

I can use Querybuilder, but i am looking if there are any function all determinate.

解决方案

Doctrine return all other object

This is not how it works, at least by default.

Doctrine uses what is called lazy loading.
From the official documentation, you have the following example:

<?php
/** @Entity */
class Article
{
    /** @Id @Column(type="integer") @GeneratedValue */
    private $id;

    /** @Column(type="string") */
    private $headline;

    /** @ManyToOne(targetEntity="User") */
    private $author;

    /** @OneToMany(targetEntity="Comment", mappedBy="article") */
    private $comments;

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

    public function getAuthor() { return $this->author; }
    public function getComments() { return $this->comments; }
}

$article = $em->find('Article', 1);

And the following explanation:

Instead of passing you back a real Author instance and a collection of comments Doctrine will create proxy instances for you. Only if you access these proxies for the first time they will go through the EntityManager and load their state from the database.

Reference: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/working-with-objects.html#entity-object-graph-traversal

More information about the topic: http://www.doctrine-project.org/blog/doctrine-lazy-loading.html

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