Playframework 3号桌之间的埃宾桥

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我有三张桌子“办公室”、“项目”和“员工”

桌面办公室多对多项目：

办公室ebean模型

@ManyToMany(mappedBy = "offices")
public List<Project> projects = new ArrayList<>();

@ManyToMany()
@JoinTable(name = "project_office",
        joinColumns = @JoinColumn(name = "project_id", referencedColumnName = "id"),
        inverseJoinColumns = @JoinColumn(name = "office_id", referencedColumnName = "id")
)

@ManyToMany(mappedBy = "projects")
public List<Employee> employees = new ArrayList<>();

@ManyToMany()
@JoinTable(name = "employee_project",
        joinColumns = @JoinColumn(name = "employee_id", referencedColumnName = "id"),
        inverseJoinColumns = @JoinColumn(name = "project_id", referencedColumnName = "id")
)

项目多对多员工：

ebean模型项目

@ManyToMany(mappedBy = "offices")
public List<Project> projects = new ArrayList<>();

@ManyToMany()
@JoinTable(name = "project_office",
        joinColumns = @JoinColumn(name = "project_id", referencedColumnName = "id"),
        inverseJoinColumns = @JoinColumn(name = "office_id", referencedColumnName = "id")
)

@ManyToMany(mappedBy = "projects")
public List<Employee> employees = new ArrayList<>();

@ManyToMany()
@JoinTable(name = "employee_project",
        joinColumns = @JoinColumn(name = "employee_id", referencedColumnName = "id"),
        inverseJoinColumns = @JoinColumn(name = "project_id", referencedColumnName = "id")
)

我想在表中的employee\u project列中包含office\u id。我不知道如何做。请帮帮我