I’m pre-populating an app with an existing database that’s to be shipped with the app.
My approach is similar to the one outlined here and it works for an initial database, but now I need to update that db and am having problems modifying it.

Part of my app involves a genogram (basically a family tree of genetic relations). That means I really only have 1 model type – a Relative, who has relation types to the person at the core of the tree (the “index” person). I’ve settled on a model of having each person defining their nuclear family (parents, siblings, children, and spouse(s)), in addition to their relation to the index. This would allow the tree to be drawn (when I get that far) by traversing the relationships, and gives an easy way for the user to verify things. It seems necessary to do this way because I don’t just need to know Person B is the aunt of Index, I need to know how – Person B is sister of Person A who is father to index, etc.

I am trying to make a temporary copy of a Swift Data model(Routine), but I get this breakpoint error at get of one of its propery(Routine.worksets). I am assuming this error happens of the relationship of Model, or because of how the models are used.

I understand that relating the Models should simplify data management in the app. I am currently developing an app that allows users to log refuel actions for cars added earlier. The goal is to delete all refuel entries when a respective car is removed. The relationship is one car to many refuel logs.

My problem is that I have two Models in my app – Car and Refuel. First one is to contain just a name of a car. User can have few cars. When a user refuels a tank and wants to log it, he selects a car from those previously saved and fills out the rest of the data. The issue that I’m having, is that my app crashes when I try to save a model (probably because I’m setting the relationship wrong).

what is the use of @Attriute(.preserveValueOnDeletion) and what is the use of this option in swiftData? the documentation just says that it preserves the value of the particular property even after deleting that object in the persistent history….but couldn’t actually find its use any where in the internet!

Here is my models:

Here is my models: