如何在Doctrine 2中使用多个targetEntity？

Question

我有两张桌子：

Event.orm.yml

manyToOne:
    last_author:
        targetEntity: User
        inversedBy: last_author_contact
        joinColumn:
            name: last_author_id
            referencedColumnName: id

User.orm.yml

oneToMany:
    last_author_contact:
        targetEntity: Event
        mappedBy: last_author

现在我想添加与“User”实体连接的新“Project”实体。 所以我必须写 User.orm.yml ：

oneToMany:
        last_author_contact:
            targetEntity: Event
            mappedBy: last_author
        last_author_project_contact:
            targetEntity: Project
            mappedBy: last_author_project

创建 Project.orm.yml ：

manyToOne:
        last_author_project:
            targetEntity: User
            inversedBy: last_author_project_contact
            joinColumn:
                name: last_author_id
                referencedColumnName: id

如何使用多个targetEntity并且无法在用户实体（setter和getters）中编写类似的代码？

像这样：

oneToMany:
    last_author_contact:
        targetEntity: Event
        targetEntity: Project
        mappedBy: last_author