php 学说 2 多对多级联
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Doctrine 2 ManyToMany cascade
提问by awattar
Is it possible in Doctrine 2 to create two objects that are many to many related and call persist only on one of them to save both?
是否可以在 Doctrine 2 中创建两个多对多相关的对象，并仅在其中一个上调用 persist 来保存两者？
User entity:
用户实体：
/**
* Owning Side
*
* @ManyToMany(targetEntity="Role", inversedBy="users", cascade={"persist"})
* @JoinTable(name="user_roles",
* joinColumns={@JoinColumn(name="user_id", referencedColumnName="id")},
* inverseJoinColumns={@JoinColumn(name="role_id", referencedColumnName="id")}
* )
*/
public $roles;
Role entity:
角色实体：
/**
* Inverse Side
*
* @ManyToMany(targetEntity="User", mappedBy="roles")
*/
public $users;
Saving:
保存：
$role = new Role();
$user = new User();
$user->roles->add($role);
$role->users->add($user);
$em->persist($user);
$em->flush();
It doesn't work and trows an error "A new entity was found through a relationship that was not configured to cascade persist operations: Entities\Role@0000000004a29c11000000005c48cb75. Explicitly persist the new entity or configure cascading persist operations on the relationship."
它不起作用并引发错误“通过未配置为级联持久操作的关系找到新实体：Entities\Role@0000000004a29c11000000005c48cb75。显式持久化新实体或在关系上配置级联持久化操作。”
回答by Hakan Deryal
You should apply cascade={"persist"}to the Role entity.
您应该申请cascade={"persist"}Role 实体。
Not an expert on Doctrine, but I think Doctrine checks the associated entity for cascading options.
不是 Doctrine 的专家，但我认为 Doctrine 检查关联实体的级联选项。
Since you are cascading the persist fromUserstoRoles, it checks the Roleentity if it should be persisted with cascade.
由于您将持久化从Users级联到Roles，它会检查Role实体是否应该使用级联持久化。
