CRUD operations with SwiftData in iOS Swift - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does CRUD stand for in app development?

CRUD stands for Create, Read, Update, and Delete. These are the four basic operations to manage data in an app.

beginner

How do you create a new object in SwiftData?

You create a new object by initializing your model and then saving the context. For example, use @Model to define data and then call context.insert(newObject) followed by context.save().

beginner

How do you fetch data using SwiftData?

Use a @Query property wrapper to fetch data. It automatically keeps your UI updated when data changes. For example, @Query var items: [Item] fetches all Item objects.

intermediate

How do you update an existing object in SwiftData?

To update, change the properties of the fetched object and then save the context. SwiftData tracks changes automatically, so just call context.save() after editing.

beginner

What is the correct way to delete an object in SwiftData?

Call context.delete(object) on the object you want to remove, then save the context with context.save(). This removes the object from the database.

Which SwiftData property wrapper is used to fetch data reactively?

A @Query

B @State

C @Published

D @ObservedObject

@Query fetches data from SwiftData and updates the UI automatically when data changes.

What must you do after creating or modifying data in SwiftData to save changes?

A Call context.save()

B Restart the app

C Call context.fetch()

D Nothing, changes save automatically

You must call context.save() to persist changes to the database.

How do you delete an object from SwiftData?

A Set object to nil

B Remove the object from an array

C context.delete(object) then context.save()

D Call object.remove()

Deleting requires calling context.delete(object) and then saving the context.

Which CRUD operation involves changing properties of an existing object?

A Delete

B Create

C Read

D Update

Update means modifying existing data.

What is the purpose of the @Model attribute in SwiftData?

A Fetches data from the database

B Defines a data model class

C Deletes data

D Updates UI state

@Model marks a class or struct as a data model for SwiftData.

Explain the steps to create and save a new data object using SwiftData.

Think about how you add a new item to a list and save it.

Describe how SwiftData helps keep your app UI updated when data changes.

Imagine your app list changes automatically when you add or remove items.