Properly update offline cache with latest version of the object

Parse/Parse/Internal/LocalDataStore/OfflineStore/PFOfflineStore.m

@@ -15,6 +15,7 @@
 #import "PFAssert.h"
 #import "PFDecoder.h"
 #import "PFEncoder.h"
+#import "PFLogging.h"
 #import "PFErrorUtilities.h"
 #import "PFFileManager.h"
 #import "PFJSONSerialization.h"
@@ -1028,15 +1029,23 @@ - (void)updateObjectIdForObject:(PFObject *)object
     @synchronized(self.lock) {
         // See if there's already an entry for new objectId.
         PFObject *existing = [self.classNameAndObjectIdToObjectMap objectForKey:key];
-        PFConsistencyAssert(existing == nil || existing == object,
-                            @"Attempted to change an objectId to one that's already known to the OfflineStore. className: %@ old: %@, new: %@",
-                            className, oldObjectId, newObjectId);
-
+        if (existing != nil && existing != object) {
+            PFLogError(PFLoggingTagCommon,
+                       @"Attempted to change an objectId to one that's already known to the OfflineStore. className: %@ old: %@, new: %@",
+                       className, oldObjectId, newObjectId);
+            PFLogError(PFLoggingTagCommon,
+                       @"Set a breakpoint on PFOfflineStoreReplaceExisingObject() to debug the issue");
+            PFLogError(PFLoggingTagCommon,
+                       @"Starting 1.17.0, the new object will replace the old one, if this is causing unexpected behaviours, please open an issue https://github.com/parse-community/Parse-SDK-iOS-OSX/issues/new");
+            PFOfflineStoreReplaceExisingObject();
+        }
         // Okay, all clear to add the new reference.
         [self.classNameAndObjectIdToObjectMap setObject:object forKey:key];
     }
 }
 
+void PFOfflineStoreReplaceExisingObject() {}
+
 - (NSString *)_generateKeyForClassName:(NSString *)className
                               objectId:(NSString *)objectId {
     return [NSString stringWithFormat:@"%@:%@", className, objectId];

Parse/Tests/Unit/QueryUnitTests.m

@@ -1420,15 +1420,10 @@ - (void)testReproduceIssue1202 {
     [Parse setApplicationId:@"a" clientKey:@"b"];
     PFObject *objectA = [PFObject objectWithClassName:@"Object" dictionary:@{@"objectId":@"yolo", @"key": @"value"}];
     objectA.objectId = @"yolo";
-    PFObject *objectB = [PFObject objectWithClassName:@"Object" dictionary:@{@"objectId":@"yolo", @"key": @"value"}];
-    @try {
-        objectB.objectId = @"yolo";
-        XCTFail();
-    }
-    @catch (NSException *e) {
-        XCTAssertEqual(e.name, NSInternalInconsistencyException);
-        XCTAssertEqualObjects(e.reason, @"Attempted to change an objectId to one that's already known to the OfflineStore. className: Object old: (null), new: yolo");
-    }
+    PFObject *objectB = [PFObject objectWithClassName:@"Object" dictionary:@{@"objectId":@"yolo", @"key": @"value2"}];
+    objectB.objectId = @"yolo";
+    PFObject *currentObject = [PFObject objectWithoutDataWithClassName:@"Object" objectId:@"yolo"];
+    XCTAssertEqual(currentObject[@"key"], @"value2");
 }