objective c - Core Data not updating, updated model -

i have weird problem has stumped me rather!

i have core data entity have added new attributes to:

deleted - boolean deleteddate - date

i have following code, upon pressing sets both values on core data object:

- (ibaction)deletebuttonintable:(id)sender {       //get id of selected item in table     nsinteger selected = [self.tweettableview rowforview:sender];      //create predicate , fetch objects core data     nsfetchrequest *request = [[nsfetchrequest alloc] init];     nspredicate *testfortrue = [nspredicate predicatewithformat:@"approved == no"];     nssortdescriptor *sortdescriptor1 = [[nssortdescriptor alloc] initwithkey:@"postdate"  ascending:no];     nsarray *sortdescriptors = [[nsarray alloc] initwithobjects:sortdescriptor1, nil];     [request setpredicate:testfortrue];     [request setsortdescriptors:sortdescriptors];      [request setentity:[nsentitydescription entityforname:@"tweet" inmanagedobjectcontext:_managedobjectcontext]];      //setup request     [request setentity:[nsentitydescription entityforname:@"tweet" inmanagedobjectcontext:_managedobjectcontext]];      //assign predicate fetch request     nserror *error = nil;      //create array returned objects     nsarray *fetchedobjects = [_managedobjectcontext executefetchrequest:request error:&error];      tweet *selectedtweet = [fetchedobjects objectatindex:selected];      if (selectedtweet) {         selectedtweet.deleted = [nsnumber numberwithbool:true];         selectedtweet.deleteddate = [nsdate date];         nslog(@"%@",selectedtweet);         [self refreshtableview];         if (! self.tweettableview){             nslog(@"tableview doesn't exist!!)");         }         [[self tweettableview] reloaddata];         [[self managedobjectcontext] commitediting];         [self saveaction:nil];     }      if ([self.autowritetweets isequaltostring:@"yes"]){         [self writetweetstoxml];         [self saveaction:nil];     } } 

now, if watch object in xcode breaks, can see attribute change on object pass through function, have table displaying datasource, filtered show objects have deleted bool set true, , nothing ever shows there.

now, make things more confusing have function exports array of objects:

-(void)writetweetstoxml{     //create new fetch request     nsfetchrequest *request = [[nsfetchrequest alloc] init];      //set new predicate fetch tweets have been favourited     nspredicate *filterfavourite = [nspredicate predicatewithformat:@"approved == yes"];     nssortdescriptor *sortdescriptor1 = [[nssortdescriptor alloc] initwithkey:self.exportsort ascending:no];     nsarray *sortdescriptors = [[nsarray alloc] initwithobjects:sortdescriptor1, nil];     [request setsortdescriptors:sortdescriptors];      //setup request     [request setentity:[nsentitydescription entityforname:@"tweet" inmanagedobjectcontext:_managedobjectcontext]];     [request setresulttype:nsdictionaryresulttype];      //assign predicate fetch request     [request setpredicate:filterfavourite];     nserror *error = nil;      //create array returned objects     nsarray *tweetstoexport = [_managedobjectcontext executefetchrequest:request error:&error];     nsassert2(tweetstoexport != nil && error == nil, @"error fetching events: %@\n%@", [error localizeddescription], [error userinfo]);        //nsstring *documents = [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) objectatindex:0];     //nsstring *path = [nsstring stringwithformat:@"%@/tweets.xml", documents]; nsstring *writeerror;      if(tweetstoexport) {         nsstring * exportlocationfull = [[nsstring alloc]initwithformat:@"%@/tweets.xml",self.exportlocation];         bool success = [tweetstoexport writetofile:exportlocationfull atomically:yes];         nslog(@"write status = %d %@", success, exportlocationfull);     }     else {         nslog(@"%@",writeerror);      }   } 

now, when @ exported file, 2 things happen odd!

firstly, object have seen have it's deleted value set true, exports value 0.

secondly, deleteddate attribute not export @ all, every, despite being in core data model. can't see way can happen doing no specific filtering on export.

it's getter/setter somewhere broken, have checked class files , should , set @dynamic.

any appreciated i'm bit lost hell going on.

people had warned me core data's quirks, plain odd!

cheers

gareth

note 1

as aside, using exact same code first section set other attributes on objects filtered , seems work fine!

you should not name core data attribute "deleted", conflicts isdeleted method of nsmanagedobject.

compare https://stackoverflow.com/a/16003894/1187415 short analysis of problem.

there other attribute names cause conflicts, e.g. "updated" (compare cannot use predicate compares dates in magical record). unfortunately, there no warnings @ compile time or runtime, , documentation on acceptable attribute names quite vague.