Is there a way to prevent inserting a duplicate object in SwiftData? – Swift

The Problem:

In an iOS app utilizing SwiftData for data management, the insertion of objects with duplicate IDs is causing persistent errors. The goal is to prevent the insertion of duplicate objects in SwiftData, ensuring unique object identification and maintaining data integrity.

The Solutions:

Solution 1: Mark the id as unique and keep autosaveEnabled as true by default

To prevent inserting a duplicate object in SwiftData, you can use the @Attribute(.unique) property wrapper to mark the id property of your model as unique. This ensures that no two objects with the same id can be inserted into the database. Additionally, you should leave the autosaveEnabled property with its default value of true. This way, any changes made to the model will be automatically saved to the database, preventing duplicates from being inserted.

Here’s an example of how you can use this approach:

struct Skin: Model {
    @Attribute(.unique) var id: UUID = UUID()
    @Attribute var displayName: String
}

By marking the id property as unique and keeping autosaveEnabled as true, you can be sure that duplicate objects will not be inserted into the database.

This approach is simple and effective and does not require any additional code or logic to handle duplicate objects. It also ensures that the data in your database remains consistent and accurate.

Video Explanation:

The following video, titled "Core Data In SwiftUI | SwiftUI Core Data Tutorial - YouTube", provides additional insights and in-depth exploration related to the topics discussed in this post.

Core Data In SwiftUI | SwiftUI Core Data Tutorial Improvement In the vid you'll see in the ContactsProvider.swift file I create a new ...