I have had to deal with this also. I think that the best solution is to just
have those empty back links and accept the clutter. You could also have
subclasses of employee, but i am sure that would cause other problems.
On 2/13/08, Ruotger Skupin <email@hidden> wrote:
>
> Hi,
>
> consider the following example (that what I would like to model):
>
> Entity: Department
> Attributes: ...whatever...
> Relationships:
> headOfDepartment --> Employee
> viceHeadOfDepartment --> Employee
> pointyHairedBoss -->
> dilbert -->
> other Employees -->>
>
>
> Entity: Employee
> Attributes: ...whatever...
> Relationships:
> department --> Department
>
>
> Every Employee is only in one Department. The Department has (and
> needs) four special Employees (head, vice head, pointy haired boss,
> dilbert). Turns out that it is impossible to model this with
> bidirectional relationships if you don't want to model it like that:
>
> Entity: Employee
> Attributes: ...whatever...
> Relationships:
> departmentImHeadOf --> Department
> departmentImViceHeadOf --> Department
> departmentImPointyHairedBossOf --> Department
> departmentImDilbertOf --> Department
> departmentOtherEmployeeOf --> Department
>
>
> The other alternative is to model it with unidirectional relationship,
> which is discouraged.
>
> Can anyone gime some advice on this?
>
> Ruotger
>
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