From 47eed616efb9596a234da05a0ad2182872692482 Mon Sep 17 00:00:00 2001
From: Blake Watters <blakewatters@gmail.com>
Date: Thu, 21 Feb 2013 23:02:23 -0500
Subject: [PATCH] Fix crash due to execution of
 `RKDeleteInvalidNewManagedObject` from outside of the dispatch queue of the
 `NSManagedObjectContext` that owns the object. fixes #1251

---
 Code/CoreData/RKManagedObjectMappingOperationDataSource.m | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Code/CoreData/RKManagedObjectMappingOperationDataSource.m b/Code/CoreData/RKManagedObjectMappingOperationDataSource.m
index 4a63a45c2a..5e5f6f4fe8 100644
--- a/Code/CoreData/RKManagedObjectMappingOperationDataSource.m
+++ b/Code/CoreData/RKManagedObjectMappingOperationDataSource.m
@@ -123,6 +123,7 @@ static id RKMutableCollectionValueWithObjectForKeyPath(id object, NSString *keyP
     return nil;
 }
 
+// Pre-condition: invoked from the managed object context of the given object
 static BOOL RKDeleteInvalidNewManagedObject(NSManagedObject *managedObject)
 {
     if ([managedObject isKindOfClass:[NSManagedObject class]] && [managedObject managedObjectContext] && [managedObject isNew]) {
@@ -326,7 +327,9 @@ - (BOOL)commitChangesForMappingOperation:(RKMappingOperation *)mappingOperation
         // Attempt to establish the connections and delete the object if its invalid once we are done
         NSOperationQueue *operationQueue = self.operationQueue ?: [NSOperationQueue currentQueue];
         NSBlockOperation *deletionOperation = [NSBlockOperation blockOperationWithBlock:^{
-            RKDeleteInvalidNewManagedObject(mappingOperation.destinationObject);
+            [[(NSManagedObject *)mappingOperation.destinationObject managedObjectContext] performBlockAndWait:^{
+                RKDeleteInvalidNewManagedObject(mappingOperation.destinationObject);
+            }];
         }];
         
         for (RKConnectionDescription *connection in connections) {