How to set primary key in Swift for Realm model

Question

I'm using Realm in a new iOS Swift project. I'm using Xcode 6.0.1 with iOS SDK 8.0 and Realm 0.85.0

I'm trying to use the new Realm primary key feature so I can do an addOrUpdateObject.

Here is a sample model:

import Foundation import Realm  class Foo: RLMObject {     dynamic var id = 0     dynamic var title = ""      func primaryKey() -> Int {         return id     } } 

And how I'm trying to add/update a new object:

let foo = Foo() foo.title = titleField.text foo.id = 1  // Get the default Realm let realm = RLMRealm.defaultRealm()  // Add to the Realm inside a transaction realm.beginWriteTransaction() realm.addOrUpdateObject(foo) realm.commitWriteTransaction() 

I get this error:

RLMExecption', reason: ''Foo' does not have a primary key and can not be updated

Here are the docs on the primary key. I'm probably not setting it correctly: http://realm.io/docs/cocoa/0.85.0/api/Classes/RLMObject.html#//api/name/primaryKey

Latest docs are here now: https://realm.io/docs/objc/latest/api/Classes/RLMObject.html#//api/name/primaryKey

Answer 1

primaryKey needs to be a class function which returns the name of the property which is the primary key, not an instance method which returns the value of the primary key.

@objcMembers class Foo: RLMObject {     dynamic var id = 0     dynamic var title = ""      override class func primaryKey() -> String? {         return "id"     } }