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Reactive ORM framework that makes the creation of complex database structures is simple. Support Linux.
.package(url: "https://github.com/k-o-d-e-n/Realtime.git", from: "0.9.7")


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Realtime is ORM framework that makes the creation of complex database structures is simple.


:point_right: Simple scalable model structure

:point_right: Files

:point_right: Collections

:point_right: References

:point_right: UI, Form

Support Firebase Database

Firebase Realtime Database is fully supported and uses in production. If you use clean Firebase API, Realtime can help to create app quicker, herewith to apply complex structures to store data, to update UI using reactive behaviors. Realtime provides lightweight data traffic, lazy initialization of data, good distribution of data.

Support FoundationDB

FoundationDB is supported, but with some limitations, because FDB has no native observing mechanisms.



In AppDelegate in func application(_:didFinishLaunchingWithOptions:) you must call code below, to configure working environment. Now for cache policy is valid values case .noCache, .persistance only. Cache in memory is not implemented yet.

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    /// ...

    /// initialize Realtime

    return true


To create any model data structure you can make by subclassing Object. You can define child properties using classes:

  • Object subclasses;
  • ReadonlyProperty, Property, Reference, Relation, ReadonlyFile, File;
  • References, Values, AssociatedValues, and so on; If you use lazy properties, you need implement class function lazyPropertyKeyPath(for:). (Please tell me if you know how avoid it, without inheriting NSObject). This function called for each subclass, therefore you don't need call super implementation. Example:
class User: Object {
    lazy var name: Property<String> = "name".property(in: self)
    lazy var age: Property<Int> = "age".property(in: self)
    lazy var photo: File<UIImage?> = "photo".file(in: self, representer: .png)
    lazy var groups: References<RealtimeGroup> = "groups".references(in: self, elements: .groups)
    lazy var scheduledConversations: Values<Conversation> = "scheduledConversations".values(in: self)
    lazy var ownedGroup: Relation<RealtimeGroup?> = "ownedGroup".relation(in: self, "manager")

    override class func lazyPropertyKeyPath(for label: String) -> AnyKeyPath? {
        switch label {
        case "name": return \User.name
        case "age": return \User.age
        case "photo": return \User.photo
        case "groups": return \User.groups
        case "ownedGroup": return \User.ownedGroup
        case "scheduledConversations": return \User.scheduledConversations
        default: return nil

let user = User(in: Node(key: "user_1"))
user.name <== "User name"
user.photo <== UIImage(named: "img")

let transaction = user.save(in: .root)
transaction.commit(with: { state, err in
    /// process error


ReadonlyProperty - readonly stored property for any value.

Property - stored property for any value.


Reference - stores reference on any database value. Doesn't imply referential integrity. Use it if record won't be removed or else other reason that doesn't need referential integrity.

Relation - stores reference on any database value.


ReadonlyFile - readonly stored property for file in Firebase Storage.

File - stored property for file in Firebase Storage.

All properties adopt @propertyWrapper feature, but while Swift is unsupported access to self in custom lazy properties, this way to define properties generally useless.


class Some: Object {
    lazy var array: Values<Object> = "some_array".values(in: self)
    lazy var references: References<Object> = "some_linked_array".references(in: self, elements: .linkedObjects)
    lazy var dictionary: AssociatedValues<Object> = "some_dictionary".dictionary(in: self, keys: .keyObjects)

Some mutable operations of collections can require isSynced state. To achieve this state use func runObserving() function or set property keepSynced: Bool to true.

(Distributed)References is array that stores objects as references. Source elements must locate in the same reference. On insertion of object to this array creates link on side object.

(Explicit)Values is array that stores objects by value in itself location. 'Explicit' prefix is used in collection that stores elements without collection view.

References, Values mutating:

do {
    let transaction = Transaction()
    let element = Element()
    try array.write(element: element, in: transaction)
    try otherArray.remove(at: 1, in: trasaction)

    transaction.commit { (err) in
        // process error

} catch let e {
    // process error

(Explicit)AssociatedValues is dictionary where keys are references, but values are objects. On save value creates link on side key object.

AssociatedValues mutating:

do {
    let transaction = Transaction()
    let element = Element()
    try dictionary.write(element: element, key: key, in: transaction)
    try otherDictionary.remove(by: key, in: transaction)

    transaction.commit { (err) in
        // process error
} catch let e {
    // process error

MapRealtimeCollection is immutable collection that gets elements from map function. This is the result of x.lazyMap(_ transform:) method, where x is any RealtimeCollection.

let userNames = Values<User>(in: usersNode).lazyMap { user in
    return user.name


  • <== - assignment operator. Can use to assign (or to retrieve) value to (from) any Realtime property.
  • ====, !=== - comparison operators. Can use to compare any Realtime properties where their values conform to Equatable protocol.
  • ?? - infix operator, that performs a nil-coalescing operation, returning the wrapped value of an Realtime property or a default value.
  • <- - prefix operator. Can use to convert instance of Closure, Assign types to explicit closure or backward.


Transaction - object that contains all information about write transactions. Almost all data changes perform using this object. The most mutable operations just take transaction as parameter, but to create custom complex operations you can use this methods:

/// adds operation of save RealtimeValue as single value as is
func set<T>(_ value: T, by node: Node) where T: RealtimeValue & RealtimeValueEvents
/// adds operation of delete RealtimeValue
func delete<T>(_ value: T) where T: RealtimeValue & RealtimeValueEvents
/// adds operation of update RealtimeValue
func update<T>(_ value: T) where T: ChangeableRealtimeValue & RealtimeValueEvents & Reverting
/// method to merge actions of other transaction
func merge(_ other: Transaction)

For more details see Example project.


SingleSectionTableViewDelegate - provides single section data source for UITableView with auto update. SectionedTableViewDelegate - provides sectioned data source for UITableView with auto update. CollectionViewDelegate - provides data source for UICollectionView with auto update.

delegate.register(UITableViewCell.self) { (item, cell, user, ip) in
        user.name, { cell, name in
            cell.textLabel?.text = name 
        { err in
delegate.tableDelegate = self

// data
        onValue: { [weak tableView] (e) in
            guard let tv = tableView else { return }
            switch e {
            case .initial: tv.reloadData()
            case .updated(let deleted, let inserted, let modified, let moved):
                tv.insertRows(at: inserted.map({ IndexPath(row: $0, section: 0) }), with: .automatic)
                tv.deleteRows(at: deleted.map({ IndexPath(row: $0, section: 0) }), with: .automatic)
                tv.reloadRows(at: modified.map({ IndexPath(row: $0, section: 0) }), with: .automatic)
                moved.forEach { from, to in
                    tv.moveRow(at: IndexPath(row: from, section: 0), to: IndexPath(row: to, section: 0))
        onError: onError
    .add(to: listeningCollector)


Available as separated module with Combine support.

class User: Object {
    var name: Property<String>
    var age: Property<Int>

class FormViewController: UIViewController {
    var form: Form<User>

    override func viewDidLoad() {
        let name = Row<TextCell, Model>.inputRow(
            title: Localized.name,
            keyboard: .name,
            placeholder: .inputPlaceholder(Localized.name),
            onText: { $0.name <== $1 }
        name.onUpdate { (args, row) in
            args.view.textField.text <== args.model.name
        let age = Row<TextCell, Model>.inputRow(
            title: Localized.age,
            keyboard: .numberPad,
            placeholder: requiredPlaceholder,
            onText: { $0.age <== $1 }
        age.onUpdate { (args, row) in
            args.view.textField.text <== args.model.age
        let button: Row<ButtonCell, Model> = Row(reuseIdentifier: "button")
        button.onUpdate { (args, row) in
            args.view.titleLabel.text = Localized.login
        button.onSelect { [unowned self] (_, row) in

        let fieldsSection: StaticSection<Model> = StaticSection(headerTitle: nil, footerTitle: nil)

        let buttonSection: StaticSection<Model> = StaticSection(headerTitle: nil, footerTitle: nil)

        form = Form(model: User(), sections: [fieldsSection, buttonSection])
        form.tableView = tableView
        form.tableDelegate = self

Local listening

To receive changes on local level use objects that conform this protocol. It has similar RxSwift interface.

public protocol Listenable {
    associatedtype OutData

    /// Disposable listening of value
    func listening(_ assign: Assign<OutData>) -> Disposable


Add debug argument 'REALTIME_CRASH_ON_ERROR' passed on launch, to catch internal errors.


Also exists NodeJS module, created for Vue.js application. Source code you can found in js folder.


Realtime objects should not passed between threads.


To run the example project, clone the repo, and run pod install from the Example directory first.


Xcode 9+, Swift 4.1+.



.package(url: "https://github.com/k-o-d-e-n/realtime.git", .branch("master"))

Realtime is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'Realtime'
pod 'RealtimeForm/Combine', :git => 'https://github.com/k-o-d-e-n/Realtime.git', :branch => 'master'


Koryttsev Denis, koden.u8800@gmail.com
Twitter: @K_o_D_e_N


Realtime is available under the MIT license. See the LICENSE file for more info.


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Last commit: 1 week ago

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iOS Software Engineer @ Perry Street Software
Perry Street Software is Jack’d and SCRUFF. We are two of the world’s largest gay, bi, trans and queer social dating apps on iOS and Android. Our brands reach more than 20 million members worldwide so members can connect, meet and express themselves on a platform that prioritizes privacy and security. We invest heavily into SwiftUI and using Swift Packages to modularize the codebase.

Release Notes

2 years ago


  • Pagination in collections;
  • Metadata in files;
  • Backward compatibility in models;
  • Support UICollectionView;


  • improved stability and convenience;

Swiftpack is being maintained by Petr Pavlik | @ptrpavlik | @swiftpackco | API