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//: To get this Playground running do the following:
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//:
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//: 1) In the scheme selector choose RealmSwift > iPhone 6s
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//: 2) Press Cmd + B
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//: 3) If the Playground didn't already run press the ▶︎ button at the bottom
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import Foundation
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import RealmSwift
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//: I. Define the data entities
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class Person: Object {
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dynamic var name = ""
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dynamic var age = 0
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dynamic var spouse: Person?
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let cars = List<Car>()
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override var description: String { return "Person {\(name), \(age), \(spouse?.name)}" }
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}
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class Car: Object {
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dynamic var brand = ""
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dynamic var name: String?
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dynamic var year = 0
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override var description: String { return "Car {\(brand), \(name), \(year)}" }
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}
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//: II. Init the realm file
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let realm = try! Realm(configuration: Realm.Configuration(inMemoryIdentifier: "TemporaryRealm"))
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//: III. Create the objects
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let car1 = Car(value: ["brand": "BMW", "year": 1980])
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let car2 = Car()
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car2.brand = "DeLorean"
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car2.name = "Outatime"
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car2.year = 1981
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// people
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let wife = Person()
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wife.name = "Jennifer"
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wife.cars.append(objectsIn: [car1, car2])
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wife.age = 47
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let husband = Person(value: [
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"name": "Marty",
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"age": 47,
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"spouse": wife
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])
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wife.spouse = husband
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//: IV. Write objects to the realm
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try! realm.write {
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realm.add(husband)
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}
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//: V. Read objects back from the realm
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let favorites = ["Jennifer"]
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let favoritePeopleWithSpousesAndCars = realm.objects(Person.self)
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.filter("cars.@count > 1 && spouse != nil && name IN %@", favorites)
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.sorted(byProperty: "age")
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for person in favoritePeopleWithSpousesAndCars {
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person.name
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person.age
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guard let car = person.cars.first else {
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continue
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}
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car.name
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car.brand
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//: VI. Update objects
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try! realm.write {
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car.year += 1
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}
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car.year
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}
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//: VII. Delete objects
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try! realm.write {
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realm.deleteAll()
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}
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realm.objects(Person.self).count
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//: Thanks! To learn more about Realm go to https://realm.io
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