I know it's a long time since you asked the question, but Paul Hudson gives a great example on how the "new" Relationship macro.
Top 3 searchresults should lead you to a great article if you search: "dog6 swiftdata".
Domain is HackingWithSwift if this is allowed to write.
VSilverstein
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NVM. Changed name of Object to Article and it worked...
Should at least give an error like:
Invalid redeclaration of 'Object'