CODEWITHSUNDEEP
swift2realmxcode7.2
Gerard G
Gerard G

Reputation: 3463

Backlinking Realm

Hi I'm playing around with Realm and I'm trying to get and output of:

Fido has 1 owners (["John"])
Rex has 2 owners (["Mary","Bob"])

Though I keep on getting this output:

Fido has 1 owners (["John"])
Rex has 1 owners (["Mary"])
Rex has 1 owners (["Bob"])

Here is the code I'm using:

// this in the app delegate
 try! realm.write {
            realm.create(Person.self, value: ["John", [["Fido", 1]]])
            realm.create(Person.self, value: ["Mary", [["Rex", 2]]])
            realm.create(Person.self, value: ["Bob", [["Rex", 2]]])
        }

        // Log all dogs and their owners using the "owners" inverse relationship
        let allDogs = realm.objects(Dog)
        for dog in allDogs {
            let ownerNames = dog.owners.map { $0.name }
            print("\(dog.name) has \(ownerNames.count) owners (\(ownerNames))")
        }


class Dog: Object {
    dynamic var name = ""
    dynamic var age = 0
    var owners: [Person] {
        // Realm doesn't persist this property because it only has a getter defined
        // Define "owners" as the inverse relationship to Person.dogs
        return linkingObjects(Person.self, forProperty: "dogs")
    }
}

class Person: Object {
    dynamic var name = ""
    let dogs = List<Dog>()
}

Thank you if you can help.

Upvotes: 2

Views: 144

Answers (1)

TiM
TiM

Reputation: 16021

From the look of it, you're creating a completely separate Rex copy, each time you're adding a new owner to the database, not re-using the same one.

It might be better to create the Dog objects separately, in advance, and then reference those objects directly when creating the Person objects.

Upvotes: 1

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