iOS: organize a coredata DB

Question

In my app I have 4 json file that I should parse. I show you a single element of json to understand.

JSON1 (Area) -> {"id"="...","id-locality"=["...","...","..."], "name"="..."}
JSON2 (Nation) -> {"id"="...", "name"="..."}
JSON3 (Provence) -> {"id"="...", "name"="..."} 
JSON4 (Locality) -> {"id"="...", "name"="..."}

As you can see JSON1 "Area" can have multiple values for locality. I created 4 entity in this way, but I'm not sure, about what type of relationship I should to use between Area and Locality identities. I have this doubt because Locality is an identity for all locality and not only for Area identity.

My prospect is this

can you help me to understand?

thanks

Answer 1

An Area has many Localities, and a Locality belongs to a single Area:

Also, don't use id for identifiers, you'll get clashes with Core Data's internal id attribute, use a specific name for your id as I've shown in my diagram.

Edited following comment

If a Person also has localities:

And now you also have an implied link between Person and Area.