I am working on a SwiftUI project using Core Data. I have an entity called AppleUser in my data model, with the following attributes: id (UUID), name (String), email (String), password (String), and createdAt (Date). All attributes are non-optional.
I created the corresponding Core Data class files (AppleUser+CoreDataClass.swift and AppleUser+CoreDataProperties.swift) using Xcode’s automatic generation. I also have a PersistenceController that initializes the NSPersistentContainer with the model name JobLinkModel.
When I try to save a new AppleUser object using:
let user = AppleUser(context: viewContext)
user.id = UUID()
user.name = "User1"
user.email = "..."
user.password = "password1"
user.createdAt = Date()【The email is correctly formatted, but it has been replaced with “…” for privacy reasons】
try? viewContext.save()
I get the following error in the console:Core Data save failed: Foundation._GenericObjCError.nilError, [:]
User snapshot: ["id": ..., "name": "User1", "email": "...", "password": "...", "createdAt": ...]
All fields have valid values, and the Core Data model seems correct. I have also tried:
• Checking that the model name in NSPersistentContainer(name:) matches the .xcdatamodeld file (JobLinkModel)
• Ensuring the AppleUser entity Class, Module, and Codegen are correctly set (Class Definition, Current Product Module)
• Deleting duplicate or old AppleUser class files
• Cleaning Xcode build folder and deleting the app from the simulator
• Using @Environment(.managedObjectContext) for the context
Despite all this, I still get _GenericObjCError.nilError when saving a new AppleUser object.
I want to understand:
1. Why is Core Data failing to save even though all fields are non-nil and correctly assigned?
2. Could this be caused by some residual old class files, or is there something else in the setup that I am missing?
3. What steps should I take to ensure that Core Data properly recognizes the AppleUser entity and allows saving?
Any help or guidance would be greatly appreciated.
