CODEWITHSUNDEEP
swiftrealm
Jonathan Tuzman
Jonathan Tuzman

Reputation: 13262

Using className() in a superclass to get the name of a subclass in Realm

I have a subclass of Object in Realm called BrowserCategory, and Artist, Decade and Genre are subclasses of BrowserCategory.

Right now each subclass of BrowserCategory has this LinkingObject property songs:

let songs = LinkingObjects(fromType: Song.self, property: "decade")

(for the Decade subclass, for example)

I'd like to write this in the BrowserCategory base class so I've tried this:

var songs = LinkingObjects(fromType: Song.self, property: className().lowercased())

However this returns the base class name and not the subclass name, giving the following error:

- Property 'Song.browsercategory' declared as origin of linking objects property 'Decade.songs' does not exist

Is there a way to do this the way I want to?

Upvotes: 2

Views: 1159

Answers (1)

matt
matt

Reputation: 534950

You are probably looking for type(of:self), which is polymorphic, as this demonstration illustrates:

class BrowserCategory {
    func className() -> String {
        return String(describing:type(of:self))
    }
}
class Artist : BrowserCategory {}
class Decade : BrowserCategory {}
class Genre : BrowserCategory {}

let a = Artist()
a.className() // "Artist"

I should caution you, however, that to ask for a class's name as a string is a very odd thing to do. It is more usual to work with a class type as a type.

Upvotes: 2

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