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realm/realm-cocoa
Realm is a mobile database: a replacement for Core Data & SQLite
.package(url: "https://github.com/realm/realm-cocoa.git", from: "vv5.0.0-beta.1")

Realm

Realm is a mobile database that runs directly inside phones, tablets or wearables. This repository holds the source code for the iOS, macOS, tvOS & watchOS versions of Realm Swift & Realm Objective-C.

Why Use Realm

  • Intuitive to Developers: Realm’s object-oriented data model is simple to learn, doesn’t need an ORM, and lets you write less code.
  • Designed for Offline Use: Realm’s local database persists data on-disk, so apps work as well offline as they do online.
  • Built for Mobile: Realm is fully-featured, lightweight, and efficiently uses memory, disk space, and battery life.

Object-Oriented: Streamline Your Code

Realm was built for mobile developers, with simplicity in mind. The idiomatic, object-oriented data model can save you thousands of lines of code.

// Define your models like regular Swift classes
class Dog: Object {
    @Persisted var name: String
    @Persisted var age: Int
}
class Person: Object {
    @Persisted(primaryKey: true) var _id: String
    @Persisted var name: String
    @Persisted var age: Int
    // Create relationships by pointing an Object field to another Class
    @Persisted var dogs: List<Dog>
}
// Use them like regular Swift objects
let dog = Dog()
dog.name = "Rex"
dog.age = 1
print("name of dog: \(dog.name)")

// Get the default Realm
let realm = try! Realm()
// Persist your data easily with a write transaction 
try! realm.write {
    realm.add(dog)
}

Live Objects: Build Reactive Apps

Realm’s live objects mean data updated anywhere is automatically updated everywhere.

// Open the default realm.
let realm = try! Realm()

var token: NotificationToken?

let dog = Dog()
dog.name = "Max"

// Create a dog in the realm.
try! realm.write {
    realm.add(dog)
}

//  Set up the listener & observe object notifications.
token = dog.observe { change in
    switch change {
    case .change(let properties):
        for property in properties {
            print("Property '\(property.name)' changed to '\(property.newValue!)'");
        }
    case .error(let error):
        print("An error occurred: (error)")
    case .deleted:
        print("The object was deleted.")
    }
}

// Update the dog's name to see the effect.
try! realm.write {
    dog.name = "Wolfie"
}

SwiftUI

Realm integrates directly with SwiftUI, updating your views so you don't have to.

struct ContactsView: View {
    @ObservedResults(Person.self) var persons
    
    var body: some View {
        List {
            ForEach(persons) { person in
                Text(person.name)
            }
            .onMove(perform: $persons.move)
            .onDelete(perform: $persons.remove)
        }.navigationBarItems(trailing:
            Button("Add") {
                $persons.append(Person())
            }
        )
    }
}

Fully Encrypted

Data can be encrypted in-flight and at-rest, keeping even the most sensitive data secure.

// Generate a random encryption key
var key = Data(count: 64)
_ = key.withUnsafeMutableBytes { bytes in
    SecRandomCopyBytes(kSecRandomDefault, 64, bytes)
}

// Add the encryption key to the config and open the realm
let config = Realm.Configuration(encryptionKey: key)
let realm = try Realm(configuration: config)

// Use the Realm as normal
let dogs = realm.objects(Dog.self).filter("name contains 'Fido'")

Data Sync

The MongoDB Realm Sync service makes it simple to keep data in sync across users, devices, and your backend in real-time.

Getting Started

We support installing Realm via Swift Package Manager, CocoaPods, Carthage, or by importing a dynamic XCFramework.

For more information, see the detailed instructions in our docs.

Documentation

The documentation can be found at docs.mongodb.com/realm/sdk/ios/.
The API reference is located at docs.mongodb.com/realm-sdks/swift/latest/

Getting Help

  • Need help with your code?: Look for previous questions with therealm tag on Stack Overflow or ask a new question. For general discussion that might be considered too broad for Stack Overflow, use the Community Forum.
  • Have a bug to report? Open a GitHub issue. If possible, include the version of Realm, a full log, the Realm file, and a project that shows the issue.
  • Have a feature request? Open a GitHub issue. Tell us what the feature should do and why you want the feature.

Building Realm

In case you don't want to use the precompiled version, you can build Realm yourself from source.

Prerequisites:

  • Building Realm requires Xcode 11.x or newer.
  • Building Realm documentation requires jazzy

Once you have all the necessary prerequisites, building Realm.framework just takes a single command: sh build.sh build. You'll need an internet connection the first time you build Realm to download the core binary.

Run sh build.sh help to see all the actions you can perform (build ios/osx, generate docs, test, etc.).

Contributing

See CONTRIBUTING.md for more details!

This project adheres to the Contributor Covenant Code of Conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior to info@realm.io.

License

Realm Objective-C & Realm Swift are published under the Apache 2.0 license.
Realm Core is also published under the Apache 2.0 license and is available here.

This product is not being made available to any person located in Cuba, Iran, North Korea, Sudan, Syria or the Crimea region, or to any other person that is not eligible to receive the product under U.S. law.

Feedback

If you use Realm and are happy with it, please consider sending out a tweet mentioning @realm to share your thoughts!

And if you don't like it, please let us know what you would like improved, so we can fix it!

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GitHub

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Release Notes

v10.15.1
Yesterday

Enhancements

  • Switch to building the Carthage release with Xcode 13.

Fixed

  • Fix compilation error where Swift 5.5 is available but the macOS 12 SDK was not. This was notable for the Xcode 13 RC. This fix adds a #canImport check for the _Concurrency module that was not available before the macOS 12 SDK.

Compatibility

  • Realm Studio: 11.0.0 or later.
  • APIs are backwards compatible with all previous releases in the 10.x.y series.
  • Carthage release for Swift is built with Xcode 13.0.
  • CocoaPods: 1.10 or later.
  • Xcode: 12.2-13.0.

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