在这个关联映射页面上,在manytomany部分有一个例子.但我不明白哪个实体(组或用户)是拥有方.
我也把代码放在这里
<?PHP /** @Entity */ class User { // ... /** * @ManyToMany(targetEntity="Group",inversedBy="users") * @JoinTable(name="users_groups") */ private $groups; public function __construct() { $this->groups = new \Doctrine\Common\Collections\ArrayCollection(); } // ... } /** @Entity */ class Group { // ... /** * @ManyToMany(targetEntity="User",mappedBy="groups") */ private $users; public function __construct() { $this->users = new \Doctrine\Common\Collections\ArrayCollection(); } // ... }
我这样读这个注释：
用户被映射为组,所以组是进行连接管理的实体,因此拥有方？
此外,我已经在文档中阅读过：
For ManyToMany bidirectional relationships either side may be the owning side (the side that defines the @JoinTable and/or does not make use of the mappedBy attribute,thus using a default join table).
这让我认为,在该实体中定义了JoinTable注释时,用户将成为所有者.
But I don’t understand which entity (group or user) is the owning side
/** * @ManyToMany(targetEntity="Group",inversedBy="users") * @JoinTable(name="users_groups") */ private $groups;
看看上面,$groups var包含与此用户关联的所有组,但如果您注意到属性定义,$groups var具有与以前一样的mappedBy值(mappedBy =“groups”)的相同名称：
/** * @ManyToMany(targetEntity="User",mappedBy="groups") */ private $users;
mappingBy是什么意思？
This option specifies the property name on the targetEntity that is the owning side of this relation.
