objective c - Core Data Integer changing value? -

i have problem core data storing integer (i chose int16 because have maximum of 6 signs).

my model holds

entity: 'expense' attribute in question is:   @property (nonatomic, retain) nsnumber * month; 

it automatically implemented nsnumber xcode (editor > createmanagedmodelsubclass)

month holds short identifier every month. example

201203     //would march of 2012 

i store new entities snippet:

[newexpense setvalue:monthnumber forkey:@"month"]; 

which works fine. monthnumber has right value before store it.

i retrieve objects fetching method , store them in array called allexpenses. array count true , have right amount of entities in it.

now this:

nsmutablearray *thismonthexpenses = [[nsmutablearray alloc]init ];  (expense *entity in allexpenses) {     int tempmonth = [[entity month]intvalue];     if (tempmonth == month) {         [thismonthexpenses addobject:entity];      } } 

to filter out right entities belong current month.

month // integer holds encoded month (again: correctly!) 

but somehow code:

int tempmonth = [[entity month]intvalue]; 

does not return 201203, strangly 4595 (always same value).

the same happens code:

for (expense *entity in monthexpenses) {     if ([entity day].intvalue == todaynumber.intvalue) { //here entity day.intvalue returns wrong integer!         [thisdayexpenses addobject:entity];     } } 

i seem missing - cannot figure out what, tried around 2 hours , wrong int value after reading entities..

any ideas?

201203 0x311f3, while 4595 0x11f3 — what's happening is, you're losing significant byte. sounds in coredata have number set 16-bit integer, isn't capable of storing number want (16 bits can represent low 5 digits in decimal). should 32-bit integer.