How to know if an object already exists in SwiftData
A step by step guide on creating a SwiftUI, UIKit or AppKit algorithm that checks if an object has been added to a SwiftData persistent storage container.
The following tutorial has been made available, along with a simple app for demonstrating SwiftData, through the tutorial/swift-data-basics branch on our Open Source Swift Starter Project.
git clone git@github.com:delasign/swift-starter-project.git
Step One: Setup the Project
Follow the tutorial linked below to add SwiftData to your project, along with the ability to search for a specific object.
Step Two: Add the Functionality
Add functionality similar that below to the project to check if an object exists within your SwiftData persistent storage container.
Please note that we are filtering by id, as this is the unique attribute that we declared in Step One.
We recommend adding this to a file called DataCoordinator+SwiftData.swift, where DataCoordinator is the name of the MainActor singleton that manages the SwiftData.
This function can be used by passing in the Id of the object that you are searching for. It will return a boolean value indicating if it exists or not.
Looking to learn more about things you can do with SwiftData, Swift or XCode ?
Consult our quick start guide or search our blog to find educational content on learning how to use SwiftData, Swift or XCode.