主义向DQL的NEW构造函数发送实体 [英] Doctrine send an entity to DQL's NEW constructor

问题描述

我在Symfony2中有一个由Doctrine编写的Blog应用程序，它由三个实体组成

I have a Blog application in Symfony2 with Doctrine, made of three entities

• Post


• 评论



• 用户

• Post
• Comment

• User

一个帖子可以有很多评论

one Post can have many Comments

此应用程序具有json API调用 / me / comments

this application has an json API call "/me/comments"

我希望它返回

[
    {
       'text': 'great post',
       ... 10 other field a comment can have ...
       'post': { 'id': 3}
    },
    {
       'text': 'i dont like it',
       ... 10 other field a comment can have ...
       'post': {'id': 4}
    },

]

正常的学说功能返回我在json中的所有关系（用户，发布），我不希望这样做，因为发布可以包含大量文本，所以我只对ID感兴趣

The normal doctrine function returns me all the relation (User, Post) in the json, which I don't want as Post can contains huge text, so i'm only interested in the Id

我尝试了许多解决方案，但发现一个

I've tried many solutions and I've found that one

http://docs.doctrine-project.org/en/latest/reference/dql-doctrine-query-language.html#new-operator-syntax

所以现在我的DQL查询看起来像这样

so now my DQL query looks like that


从注释中选择新的CommentDTO（c）作为c在哪里。 author =：user


CommentDTO的构造函数如下

the constructor of CommentDTO looks like that

__construct(Comment c) {
   $this->text = c.getText();
   $this->post = [ 'id' => c.getPost().getId() ];
}

我执行该程序时

{
   "code":500,
   "message":"Argument 1 passed to MVMS\\ApiBundle\\Entity\\CommentDTO::__construct() must be an instance of MVMS\\ApiBundle\\En
tity\\Comment, integer given"

}

当然我可以一个一个地给参数，但是Comment有十二个字段并一个一地发送

of course I could give the parameter one by one but Comment has a dozen of fields and sending them one by one seems highly hackish.

是否可以直接发送对象？

Is there a way to send the object directly ?

推荐答案

如@Cerad在评论中所述，根据文档，即在2017年仍然有意义：

As mentioned by @Cerad in the comments, there is no current way to achieve this, according to the documentation, which is still relevant in 2017:

请注意，您只能将标量表达式传递给构造函数。

Note that you can only pass scalar expressions to the constructor.

我在 issue tracker中找不到相关的功能请求，因此在可预见的将来可能不会实现。

I could not find a related feature request in the issue tracker, so it will likely not be implemented in the foreseeable future.

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