我正在尝试使用带有laravel的Doctrine,我能够完成所有映射并返回一些结果。但问题在于一对多的关系,即多边的ArrayCollection是空的。
我有两个类Project和Client,一个Client有很多Project。在项目列表中,我确实成功返回客户端,但是在客户端,Project数组是空的。这是我总结的客户端类:
<?php
namespace CodeProject\Entities\Doctrine;
use Doctrine\ORM\Mapping as ORM;
/**
* @ORM\Entity
* @ORM\Table(name="clients")
*/
class Client implements \JsonSerializable {
/**
* @ORM\Column(type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
*
* @ORM\OneToMany(targetEntity="Project", mappedBy="client")
*/
private $projects;
public function __construct() {
$this->projects = new ArrayCollection();
}
}
现在汇总了Project类:
<?php
namespace CodeProject\Entities\Doctrine;
use Doctrine\ORM\Mapping as ORM;
/**
* @ORM\Entity
* @ORM\Table(name="projects")
*/
class Project implements \JsonSerializable {
/**
* @ORM\Column(type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
*
* @ORM\ManyToOne(targetEntity="Client", inversedBy="projects")
* @ORM\JoinColumn(name="client_id", referencedColumnName="id")
*/
private $client;
}
当我访问控制器以获取有关客户端的信息时,这里是返回的内容,请注意项目是一个空数组:
[
{
"id": 21,
"name": "Dolores Osinski",
"responsible": "Ashton Conn",
"email": "Crist.Mario@gmail.com",
"phone": "(936)177-7976",
"address": "80311 Rossie Drives\nLake Brandyn, KS 39255-7560",
"obs": "Aliquid harum architecto eum natus qui.",
"created_at": "2017-03-19 16:33:39",
"updated_at": "2017-03-19 16:33:39",
"projects": {}
}
]
在项目方面,我可以看到客户端:
[
{
"id": 1,
"name": "tenetur",
"description": "Animi ut enim voluptas. Provident alias aut animi nemo repellendus. A dolores magni ducimus sit ex.",
"progress": "39.00",
"status": 4,
"due_date": "1972-10-26 12:56:38",
"created_at": "2017-03-19 16:33:45",
"updated_at": "2017-03-19 16:33:45",
"client": {
"id": 21,
"name": "Dolores Osinski",
"responsible": "Ashton Conn",
"email": "Crist.Mario@gmail.com",
"phone": "(936)177-7976",
"address": "80311 Rossie Drives\nLake Brandyn, KS 39255-7560",
"obs": "Aliquid harum architecto eum natus qui.",
"created_at": "2017-03-19 16:33:39",
"updated_at": "2017-03-19 16:33:39",
"projects": {}
}
}
]
我错过了什么?
更新
我的ClientRepository:
<?php
namespace CodeProject\Repositories;
use Doctrine\ORM\EntityRepository;
class ClientRepositoryDoctrine extends EntityRepository {
public function getProjects($id) {
$client = $this->find($id);
return $client->getProjects();
}
}
我的ClientController在列出某个客户的项目的函数中:
public function listProjects($id){
return response()->json($this->repository->getProjects($id));
}
即便如此,它也没有列出任何内容。
使用fetch join在我的存储库中尝试使用DQL:
<?php
namespace CodeProject\Repositories;
use Doctrine\ORM\EntityRepository;
class ClientRepositoryDoctrine extends EntityRepository {
public function getProjects($id) {
$result = $this->getEntityManager()->createQueryBuilder()->
select('c, p')->
from('CodeProject:Client', 'c')->
join('c.projects', 'p')->
where('c.id = :id')->
setParameter(':id', $id)->getQuery()->getResult();
return $result;
}
}
我得到了这个,即使使用fetch join强制加载项目,项目仍然是空的:
[
{
"id": 1,
"name": "Mariam Jast",
"responsible": "Imogene Schowalter",
"email": "wHackett@gmail.com",
"phone": "05482413294",
"address": "062 Block Parkway\nMireyabury, KS 63554-2056",
"obs": "Occaecati aperiam quibusdam maxime laboriosam aperiam sint.",
"created_at": "2017-03-20 02:29:47",
"updated_at": "2017-03-20 02:29:47",
"projects": {}
}
]
答案 0 :(得分:1)
听起来你永远不会加载关系。默认情况下,OneToMany关系会延迟加载。
您可以通过对其执行任何需要数据库调用的操作来触发加载。在这个例子中,一个简单的foreach就足够了。
foreach($client->getProjects() as $project) {
// ...
}
您还可以将关系配置为急切加载。资料来源:21.2.26. @OneToMany
/**
* @OneToMany(..., fetch="EAGER")
**/
这也可以是每个DQL查询。资料来源:14.2.2. Joins
SELECT c, c.projects FROM Client c
关于Project.client的加载,可以是实体地图。您已经从实体管理器加载了客户端,因此当项目实例显示&#34;我有client_id = 1&#34;您的实体管理员注意到客户端#1已经加载,并将其与Project.client关系相关联。
另一种方式是不可能的,因为Doctrine无法知道您已经加载了客户可以拥有的所有可能的项目。找出的唯一真正方法是查询数据库。