xcode - edit an attribute in core data -

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here code edit particular attribute , save sqlite db can't save changes db.

-(void)changememberkey {   nsentitydescription *entitydesc=[nsentitydescription entityforname:@"table1" inmanagedobjectcontext:context];   nsfetchrequest *request=[[nsfetchrequest alloc] init];   nspredicate *predicate=[nspredicate predicatewithformat:@"(member_id=null)"];   [request setpredicate:predicate];   [request setentity:entitydesc];   table1 *matches;   nserror *error;    nsarray *objects=[context executefetchrequest:request error:&error];   nslog(@"object count===%d",[objects count]);   for(int i=0;i<[objects count];i++)   {     matches=[objects objectatindex:i];     table1 *data=(table1 *)matches;     nslog(@"data before===%@",data);     [data setvalue:memberkey forkey:@"member_id"];     [context save:&error];     nslog(@"data after====%@",data);     data=nil;   }    entitydesc=nil;   request=nil;   matches=nil;   error=nil;   objects=nil; }

try replace for loop to

for(table1 * data in objects)   data.member_id = memberkey;  if (! [context save:&error])   nslog(@"couldn't save data! error:%@", [error description]);

not sure whether it'll work or not, take try. anyway, it's cleaner.


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