diff --git a/Example/IceCream_Example/OwnersViewController.swift b/Example/IceCream_Example/OwnersViewController.swift
index d3a32d4f..3942f1a2 100644
--- a/Example/IceCream_Example/OwnersViewController.swift
+++ b/Example/IceCream_Example/OwnersViewController.swift
@@ -76,21 +76,28 @@ extension OwnersViewController: UITableViewDelegate {
     func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
         guard indexPath.row < owners.count else { return }
         let owner = owners[indexPath.row]
-        let viewController = OwnerDetailViewController(cats: Array(owner.cats))
+        let viewController = OwnerDetailViewController(cats: Array(owner.cats).filter { !$0.isDeleted })
         navigationController?.pushViewController(viewController, animated: true)
     }
     
     func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
-        let addAction = UITableViewRowAction(style: .default, title: "Add cat") { (_, ip) in
+        let addCatAction = UITableViewRowAction(style: .default, title: "Add cat") { (_, ip) in
             guard ip.row < self.owners.count else { return }
             let owner = self.owners[ip.row]
             let newCat = Cat()
-            newCat.name = "Cat No.\(owner.cats.count)"
+            newCat.name = "\(owner.name)'s No.\(owner.cats.count + 1) cat"
             newCat.age = ip.row
             try! self.realm.write {
                 owner.cats.append(newCat)
             }
         }
+        let deleteCatAction = UITableViewRowAction(style: .default, title: "Delete cat") { (_, ip) in
+            guard ip.row < self.owners.count else { return }
+            let owner = self.owners[ip.row]
+            try! self.realm.write {
+                owner.cats.last?.isDeleted = true
+            }
+        }
         let deleteAction = UITableViewRowAction(style: .destructive, title: "Delete") { (_, ip) in
             let alert = UIAlertController(title: NSLocalizedString("caution", comment: "caution"), message: NSLocalizedString("sure_to_delete", comment: "sure_to_delete"), preferredStyle: .alert)
             let deleteAction = UIAlertAction(title: NSLocalizedString("delete", comment: "delete"), style: .destructive, handler: { (action) in
@@ -105,7 +112,7 @@ extension OwnersViewController: UITableViewDelegate {
             alert.addAction(deleteAction)
             self.present(alert, animated: true, completion: nil)
         }
-        return [addAction, deleteAction]
+        return [addCatAction, deleteCatAction, deleteAction]
     }
 }
 
diff --git a/IceCream/Classes/CKRecordConvertible.swift b/IceCream/Classes/CKRecordConvertible.swift
index 4234bf91..fcb23a7b 100644
--- a/IceCream/Classes/CKRecordConvertible.swift
+++ b/IceCream/Classes/CKRecordConvertible.swift
@@ -121,15 +121,15 @@ extension CKRecordConvertible where Self: Object {
                     var referenceArray = [CKRecord.Reference]()
                     let wrappedArray = list._rlmArray
                     for index in 0..<wrappedArray.count {
-                        guard let object = wrappedArray[index] as? Object , let primaryKey = object.objectSchema.primaryKeyProperty?.name else { continue }
+                        guard let object = wrappedArray[index] as? Object, let primaryKey = object.objectSchema.primaryKeyProperty?.name else { continue }
                         switch object.objectSchema.primaryKeyProperty?.type {
                         case .string:
-                            if let primaryValueString = object[primaryKey] as? String {
+                            if let primaryValueString = object[primaryKey] as? String, let obj = object as? CKRecordConvertible, !obj.isDeleted {
                                 let referenceZoneID = CKRecordZone.ID(zoneName: "\(object.objectSchema.className)sZone", ownerName: CKCurrentUserDefaultName)
                                 referenceArray.append(CKRecord.Reference(recordID: CKRecord.ID(recordName: primaryValueString, zoneID: referenceZoneID), action: .none))
                             }
                         case .int:
-                            if let primaryValueInt = object[primaryKey] as? Int {
+                            if let primaryValueInt = object[primaryKey] as? Int, let obj = object as? CKRecordConvertible, !obj.isDeleted {
                                 let referenceZoneID = CKRecordZone.ID(zoneName: "\(object.objectSchema.className)sZone", ownerName: CKCurrentUserDefaultName)
                                 referenceArray.append(CKRecord.Reference(recordID: CKRecord.ID(recordName: "\(primaryValueInt)", zoneID: referenceZoneID), action: .none))
                             }
diff --git a/IceCream/Classes/CKRecordRecoverable.swift b/IceCream/Classes/CKRecordRecoverable.swift
index 55208c4d..edae7182 100644
--- a/IceCream/Classes/CKRecordRecoverable.swift
+++ b/IceCream/Classes/CKRecordRecoverable.swift
@@ -76,8 +76,10 @@ extension CKRecordRecoverable where Self: Object {
                                 if let existObject = realm.object(ofType: uListType, forPrimaryKey: primaryKeyValue) {
                                     uList.append(existObject)
                                 } else {
-                                    let object = realm.create(uListType)
-                                    uList.append(object)
+                                    try! realm.write {
+                                        let object = realm.create(uListType)
+                                        uList.append(object)
+                                    }
                                 }
                             }
                             
@@ -85,8 +87,10 @@ extension CKRecordRecoverable where Self: Object {
                                 if let existObject = realm.object(ofType: vListType, forPrimaryKey: primaryKeyValue) {
                                     vList.append(existObject)
                                 } else {
-                                    let object = realm.create(vListType)
-                                    vList.append(object)
+                                    try! realm.write {
+                                        let object = realm.create(vListType)
+                                        vList.append(object)
+                                    }
                                 }
                             }
                             
@@ -94,8 +98,10 @@ extension CKRecordRecoverable where Self: Object {
                                 if let existObject = realm.object(ofType: wListType, forPrimaryKey: primaryKeyValue) {
                                     wList.append(existObject)
                                 } else {
-                                    let object = realm.create(wListType)
-                                    wList.append(object)
+                                    try! realm.write {
+                                        let object = realm.create(wListType)
+                                        wList.append(object)                                        
+                                    }
                                 }
                             }