My idea:

I have an entity contact, that gets vertically inherited into actor, employee, visitor, nicepersontoalwayinviteforfreetoanyshow, whatever, based on the role somebody/thing plays. 

A contact can have different roles, which makes this contact playing actor, employee, visitor, nicepersontoalwayinviteforfreetoanyshow or whatever. So there is a m-n relation roles in a contact. 

I assumed that I should be able to create and get a visitor if I could describe in the EOModel qualifier something like roles.ROLE.name = 'visitor'

Something like this:
And I would create the relation to the role in the awakeFromInsertion phase of the Visitor. 

Of course this is not working, (nothing ever works where I live) as I am getting 

 takeValueForKey(): attempt to assign value to unknown key: 'roles.ROLE.name'. This class does not have an instance variable of the name roles.ROLE.name


What is the proper incantation to do this?


Johan Henselmans



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