Realm+CascadingDeletions

Realm+CascadingDeletions.swift

import Foundation
import RealmSwift

protocol CascadingDeletable {
    var cascadingDeletions: [AnyObject?] { get }
}

extension Realm {
    
    func delete<T: AnyObject>(cascading: List<T>) where T: CascadingDeletable {
        let o = cascading
        cascading.removeAll()
        delete(o)
    }
    
    func delete<T: AnyObject>(cascading: Results<T>) where T: CascadingDeletable {
        let o = cascading
        delete(o)
    }
    
    func delete<T: AnyObject>(cascading: [T]) where T: CascadingDeletable {
        for c in cascading {
            delete(c as! Object)
        }
    }
    
    func delete<T: AnyObject>(cascading: T) where T: Object, T: CascadingDeletable {
        
        for child in cascading.cascadingDeletions {
            if let object = child as? Object {
                delete(object)
            }
            if let cascade = child as? CascadingDeletable {
                delete(cascade as! Object)
            }
        }
        
        delete(cascading)
    }
}

@AnthonyMDev - Realm provides initializers for an array of Realm Object<T>. The compiler can't infer the correct object type if you use .toArray().

func delete<T: AnyObject>(_ objects: List<T>, cascade: Bool = true) where T: CascadingDeletable {
    delete(Array(objects), cascade: cascade)
}

func delete<T: AnyObject>(_ objects: Results<T>, cascade: Bool = true) where T: CascadingDeletable {
    delete(Array(objects), cascade: cascade)
}

I tested this code today but it does not fullfill the requirements of a full cascading delete.

All my model classes are impelmenting the CascadingDeletable protocoll and are returning all childs that should be deleted in the cascadingDeletions array. Lets say you have the following structure:

Object A
   Sub 1
   Sub 2
      SubSub 2.1
      SubSub 2.2
   Sub 3
   ...

Sub 1, Sub 2, Sub 3 are getting deleted but SubSub 2.1, SubSub 2.2 and the Object A itself are not getting deleted with current Realm 2.4.0 version and your extensions. Tested on XCode 8 with Swift 3.0 and Realm 2.4.0.

Same issue here, I haven't been able to remove the a List attribute.

Any solutions to this?