主义加入绕过懒惰加载 [英] Doctrine join bypass lazy loading

问题描述

我刚刚开始探索Symfony2，令我感到惊奇的是它有多少优秀功能。我开始做博客教程：
http://tutorial.symblog.co.uk/

但使用版本2.1而不是2.0

I just started exploring Symfony2 and I am amazed how many great features it has. I started doing the blog tutorial at: http://tutorial.symblog.co.uk/
but using version 2.1 instead of 2.0

我的问题是我有以下博客实体：

My problem is that i have the following entity for Blog:

/**
 * @ORM\OneToMany(targetEntity="Comment", mappedBy="blog")
 */
protected $comments;

以及注释实体中的以下内容：

and the following in the Comment entity:

/**
 * @var string $blog
 *
 * @ORM\ManyToOne(targetEntity="Blog", inversedBy="comments")
 * @ORM\JoinColumn(name="blog_id", referencedColumnName="id")
 */
private $blog; 

我创建了获取最新博客并加入评论的功能，所以我不必懒惰加载评论对于每个博客，并避免对这些注释表进行多次调用：

I created the function to get the latest blogs and join the comments so i dont have to lazy load comments for each blog and avoid multiple calls to the comments table like so:

$qb = $this->createQueryBuilder('b')
            ->select('b')
            ->leftJoin('b.comments', 'c')
            ->addOrderBy('b.created', 'DESC'); 

但是当我在树枝模板中运行时，该查询的结果如下： blog.comments 我得到第一个查询来检索博客是正确的加入它，但然后，而不是使用联结的价值评论我可以调用每个博客条目的注释表？如何避免这种情况的功能，但是保持关系，以便我可以从视图博客页面获取博客的所有评论。

but when i run in the twig template the result from that query as: blog.comments I got the first query to retrieve the blogs correct with the join in it but then instead of using the joined value for comments i get a call to the comments table for each blog entry? How do I bypass that functionality for that certain case but keep the relationship so i can get all comments for a blog from the view blog page?

推荐答案

您还需要将注释对象添加到选择结果中：

You also need to add the comment objects to the select results:

->select('b', 'c')

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