Doctrine 条令鉴别器如何从地图中知道使用哪个实体
今天我有一个任务,要写一个鉴别器,这是我第一次了解条令鉴别器是如何工作的。看完这些文件后,下面是我所做的 我需要创建一个命令来更改blog/post作者,然后还需要更新关于事件的动作实体 行动实体:Doctrine 条令鉴别器如何从地图中知道使用哪个实体,doctrine,symfony4,discriminator,Doctrine,Symfony4,Discriminator,今天我有一个任务,要写一个鉴别器,这是我第一次了解条令鉴别器是如何工作的。看完这些文件后,下面是我所做的 我需要创建一个命令来更改blog/post作者,然后还需要更新关于事件的动作实体 行动实体: /** * @ORM\Table(name="action") * @ORM\Entity() * @ORM\InheritanceType("JOINED") * @ORM\DiscriminatorColumn(name="discriminator", type="string")
/**
* @ORM\Table(name="action")
* @ORM\Entity()
* @ORM\InheritanceType("JOINED")
* @ORM\DiscriminatorColumn(name="discriminator", type="string")
* @ORM\DiscriminatorMap({"action" = "Action", "blog" = "Blog", "post" = "Post"})
*/
class Action
{ ...
在eventCommand中的某个位置:
...
$action = new Action();
$action->setType('author_change');
$this->em->persist($action);
运行该命令后,所有这些都将正常工作。唯一的问题是动作鉴别器每次都保存“动作”,而不是“博客”或“帖子”
即使我这样强制,列也不会更改:
$action->setDiscriminator('blog');
因此,我想我的问题是,Action如何知道,我应该如何从地图中触发要使用的鉴别器?要检查的事项:
- 您的父实体是
,请确保Action
和Blog
都扩展它Post
- 如果希望子类能够访问
类中的所有属性(包括id),则应保护这些属性Action
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* @ORM\Entity(repositoryClass="App\Repository\ActionRepository")
* @ORM\InheritanceType("JOINED")
* @ORM\DiscriminatorColumn(name="discriminator", type="string")
* @ORM\DiscriminatorMap({"action" = "Action", "blog" = "Blog", "post" = "Post"})
*/
class Action
{
/**
* @ORM\Id()
* @ORM\GeneratedValue()
* @ORM\Column(type="integer")
*/
protected $id;
/**
* @ORM\Column(type="string", length=255, nullable=true)
*/
protected $name;
// ... getters and setters for $id and $name (notice they are also protected, not private !!!)
}
以及控制器:
/**
* @Route("/test", name="test")
*/
public function test()
{
$manager = $this->getDoctrine()->getManager();
$action = new Action();
$action->setName('my action');
$blog = new Blog();
$blog
->setName('my blog')
->setBlogProp('my blog prop');
$post = new Post();
$post
->setName('my post')
->setPostProp('my post prop');
$manager->persist($action);
$manager->persist($blog);
$manager->persist($post);
$manager->flush();
}
运行控制器代码后:
mysql> select * from action;
+----+-----------+---------------+
| id | name | discriminator |
+----+-----------+---------------+
| 1 | my post | post |
| 2 | my blog | blog |
| 3 | my action | action |
+----+-----------+---------------+
3 rows in set (0.00 sec)
mysql> select * from blog;
+----+--------------+
| id | blog_prop |
+----+--------------+
| 2 | my blog prop |
+----+--------------+
1 row in set (0.00 sec)
mysql> select * from post;
+----+--------------+
| id | post_prop |
+----+--------------+
| 1 | my post prop |
+----+--------------+
1 row in set (0.00 sec)
mysql> describe action;
+---------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| name | varchar(255) | YES | | NULL | |
| discriminator | varchar(255) | NO | | NULL | |
+---------------+--------------+------+-----+---------+----------------+
mysql> describe blog;
+-----------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+-------+
| id | int(11) | NO | PRI | NULL | |
| blog_prop | varchar(255) | YES | | NULL | |
+-----------+--------------+------+-----+---------+-------+
mysql> describe post;
+-----------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+-------+
| id | int(11) | NO | PRI | NULL | |
| post_prop | varchar(255) | YES | | NULL | |
+-----------+--------------+------+-----+---------+-------+
/**
* @Route("/test", name="test")
*/
public function test()
{
$manager = $this->getDoctrine()->getManager();
$action = new Action();
$action->setName('my action');
$blog = new Blog();
$blog
->setName('my blog')
->setBlogProp('my blog prop');
$post = new Post();
$post
->setName('my post')
->setPostProp('my post prop');
$manager->persist($action);
$manager->persist($blog);
$manager->persist($post);
$manager->flush();
}
mysql> select * from action;
+----+-----------+---------------+
| id | name | discriminator |
+----+-----------+---------------+
| 1 | my post | post |
| 2 | my blog | blog |
| 3 | my action | action |
+----+-----------+---------------+
3 rows in set (0.00 sec)
mysql> select * from blog;
+----+--------------+
| id | blog_prop |
+----+--------------+
| 2 | my blog prop |
+----+--------------+
1 row in set (0.00 sec)
mysql> select * from post;
+----+--------------+
| id | post_prop |
+----+--------------+
| 1 | my post prop |
+----+--------------+
1 row in set (0.00 sec)