I'm trying to port my model code to use Core Data. My model is
something like this:
I have a Company. It has two to-many relationships, currentEmployees
and previousEmployees which are naturally both to Employees.
Employees have a to-one relationship to the Company that is the
inverse of both the currentEmployees and previousEmployees. That is,
the employee (records) belong to the Company regardless of current/
previous "status".
I also have a Consultant. It has a to-many relationship to
interestingEmployees. Nobody talking to an Employee needs to have
access to the Consultant, so there is no inverse relationship.
I have two problems with this model. When I compile it, I get a warning:
Consultant.interestingEmployees -- to-many relationship does not have
an inverse: this is an advanced setting (no object can be in multiple
destinations for a specific relationship)
This error doesn't make sense to me. Is it trying to say an object can
only "belong" to one to-many relationship?
The other problem is that I do want to define an inverse for
Employee.company, but I can't set it to *both*
Company.currentEmployees and .previousEmployees. I think the answer is
to maintain the Employee.company relationship field myself without any
inverse, but then I get two more warnings for each of the Company to-
many relationships.
This model was easy to implement in Foundation, I just created a bunch
of Employee objects and just made sure they were in the proper sets
(current/previous/interesting). I suppose I could model this by just
having the "current"/"previous" and "interesting"/"not interesting"
status be properties of the Employees themselves, but I'd prefer that
A) Employees don't have access to these statuses and B) that my
Company/Consultant can have tidy sets of relevant Employees. What's
the best way for an object to be belong to multiple to-many
relationships in Core Data?
thanks,
-natevw
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