filter child entities collections with predicate in IOS (objective c )? -

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i want set predicate on fire date.

attribute alerts of entity history nsorderset.

enter image description here

nsfetchrequest *fetchrequest = [[nsfetchrequest alloc]initwithentityname:@"history"];     nstimeinterval interval = [[nsdate date] timeintervalsince1970]; nsdate *tempcurrent = [nsdate datewithtimeintervalsince1970:interval];  // firetime nspredicate *predicate = [nspredicate predicatewithformat:@"alerts.firetime < %@", tempcurrent]; [fetchrequest setpredicate:predicate]; [[managedobjectcontext executefetchrequest:fetchrequest error:nil] count]; nsinteger count = [managedobjectcontext countforfetchrequest:fetchrequest error:nil]; nslog(@"%li",(long)count);`

problem fetched objects count equal zero. no data fetched core data.


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