Realm Cascade delete

RealmCascadeDelete

/// Cascade delete object in Realm
    ///
    /// - warning: Call only in write transaction
    /// - Parameters:
    ///   - object: Object to delete
    ///   - realm:  Realm instance
    ///   - onlyProperties: removeOnly property (ex. before re-write/update model) 
    func cascadeDelete(_ object: Object, with realm: Realm, onlyProperties: Bool = false) {
        
        guard !object.isInvalidated else { return }
        
        for property in object.objectSchema.properties {
            cascadeDelete(valueForKey: property.name, for: object, in: realm)
        }
        
        if !onlyProperties {
            realm.delete(object)
        }
    }

/// Cascade delete by key path of model in Realm
    ///
    /// - warning: Call only in write transaction
    /// - Parameters:
    ///   - key: key path of property
    ///   - object: Object model
    ///   - realm: Realm instance
    func cascadeDelete(valueForKey key: String, for object: Object, in realm: Realm) {
        
        guard let value = object.value(forKey: key) else { return }
        
        if let object = value as? Object {
            cascadeDelete(object, with: realm)
        }
        
        if let list = value as? List<Object> {
            list.forEach { cascadeDelete($0, with: realm) }
        }
    }

//----Usage-------
 // realm - current realm instance
 // realmModels - array of Objects - [Object]
 // User - Realm object 
        
        ///Cascade delete of object
        try! realm.write({
            realmModels.forEach{ cascadeDelete($0, with: realm) }
        })

        ///Cascade delete of object's property
        try! realm.write({
            realmModels.forEach{ cascadeDelete(#keyPath(User.childObject), forObject: $0, in: realm) }
        })