s behavior by setting a merge policy 
            to your <code>NSManagedObjectContext</code>:</p>
    <table
    class="sample"><tr><td align="left"
                    ><pre>managedObjectContext.mergePolicy = [[[NSMergePolicy alloc] initWithMergeType:NSMergeByPropertyStoreTrumpMergePolicyType] autorelease];</pre>
                </td></tr></table>
    
    <p>There are five NSMergePolicyTypes available: <code>NSErrorMergePolicyType</code>
        (default), <code>NSMergeByPropertyStoreTrumpMergePo