问题描述

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 以保存两者?

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?

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;

角色实体:

    /**
 * Inverse Side
 *
 * @ManyToMany(targetEntity="User", mappedBy="roles")
 */
public $users;

保存:

    $role = new Role();

    $user = new User();

$user->roles->add($role);
$role->users->add($user);

$em->persist($user);
$em->flush();

它不起作用并引发错误通过未配置为级联持久化操作的关系找到新实体:EntitiesRole@0000000004a29c11000000005c48cb75.显式持久化新实体或在关系上配置级联持久化操作."

It doesn't work and trows an error "A new entity was found through a relationship that was not configured to cascade persist operations: EntitiesRole@0000000004a29c11000000005c48cb75. Explicitly persist the new entity or configure cascading persist operations on the relationship."

推荐答案

您应该将 cascade={"persist"} 应用于 Role 实体.

You should apply cascade={"persist"} to the Role entity.

不是 Doctrine 专家，但我认为 Doctrine 检查关联实体的级联选项.

Not an expert on Doctrine, but I think Doctrine checks the associated entity for cascading options.

由于您将持久从 用户 到 角色，它会检查角色 实体，如果它应该被级联持久化.

Since you are cascading the persist from Users to Roles, it checks the Role entity if it should be persisted with cascade.

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