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Data Core Entity Relationships

Hi,

I have a problem to create the appropriate relations ship in Core Data. For example, I have an entity Persons [name, lastname, address] also an entity FriendShips. I can create a One-to-Many relationship from Persons to FriendShips, but how do I fill the FriendShips with the Persons Entities
?
In a ‘regular’ sql database I would use the id’s from the Persons and store them in the FriendShips. How is this achieved in Data Core?