add support for the conversion of recordID to Int type primaryKey

Author: Sol Cai

IceCream/Classes/CKRecordRecoverable.swift

@@ -76,7 +76,7 @@ extension CKRecordRecoverable where Self: Object {
                 if let asset = record.value(forKey: prop.name) as? CKAsset {
                     recordValue = CreamAsset.parse(from: prop.name, record: record, asset: asset)
                 } else if let owner = record.value(forKey: prop.name) as? CKRecord.Reference, let ownerType = prop.objectClassName {
-                    recordValue = realm.dynamicObject(ofType: ownerType, forPrimaryKey: owner.recordID.recordName)
+                    recordValue = realm.dynamicObject(ofType: ownerType, forPrimaryKey: primaryKeyForRecordID(recordID: owner.recordID))
                     // Because we use the primaryKey as recordName when object converting to CKRecord
                 }
             default:
@@ -88,4 +88,13 @@ extension CKRecordRecoverable where Self: Object {
         }
         return o
     }
+    
+    /// The primaryKey in Realm could be type of Int or String. However the `recordName` is a String type, we need to make a check.
+    /// The reversed process happens in `recordID` property in `CKRecordConvertible` protocol.
+    ///
+    /// - Parameter recordID: the recordID that CloudKit sent to us
+    /// - Returns: the specific value of primaryKey in Realm
+    static func primaryKeyForRecordID(recordID: CKRecord.ID) -> Any {
+        return Int(recordID.recordName) ?? recordID.recordName
+    }
 }

IceCream/Classes/SyncObject.swift

@@ -91,7 +91,7 @@ extension SyncObject: Syncable {
 
     public func delete(recordID: CKRecord.ID) {
         DispatchQueue.main.async {
-            guard let object = self.realm.object(ofType: T.self, forPrimaryKey: recordID.recordName) else {
+            guard let object = self.realm.object(ofType: T.self, forPrimaryKey: T.primaryKeyForRecordID(recordID: recordID)) else {
                 // Not found in local realm database
                 return
             }