iphone - mergeChangesFromContextDidSaveNotification deleting records -


i trying update records in coredata on background thread. creating nsmanagedobjectcontext's each thread per documentation. registering notifications when data saved. however, mergechangesfromcontextdidsavenotification deleting entries instead of updating them.

//notification callback - (void)_managedobjectcontextdidsave:(nsnotification *)notification {     dispatch_async(dispatch_get_main_queue(), ^{         [self.managedobjectcontext mergechangesfromcontextdidsavenotification:notification];     }); }  //per thread managed object context - (nsmanagedobjectcontext *)managedobjectcontext {     if ([[[nsthread currentthread] threaddictionary] objectforkey:gvcontrollermanagedobjectcontextkey] == nil) {         nspersistentstorecoordinator *coordinator = self._persistentstorecoordinator;         if (coordinator != nil) {             nsmanagedobjectcontext *managedobjectcontext = [[nsmanagedobjectcontext alloc] init];             [managedobjectcontext setpersistentstorecoordinator:coordinator];             if (![nsthread ismainthread]) {                 [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(_managedobjectcontextdidsave:) name:nsmanagedobjectcontextdidsavenotification object:managedobjectcontext];             }             [[[nsthread currentthread] threaddictionary] setobject:managedobjectcontext forkey:gvcontrollermanagedobjectcontextkey];             [managedobjectcontext release];         }     }      return [[[nsthread currentthread] threaddictionary] objectforkey:gvcontrollermanagedobjectcontextkey]; }

looks using managed object thread (added property of objects updating).


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