ios - Fetching data from entity using nspredicate -


i have core data entity called "songs" contains details of different songs details. 1 of attribute of entity "language". want fetch songs language spanish. if number of songs spanish zero, should fetch songs default language, thats english. possible through single nspredicate if know default language , needed language.

you can way.

nsentitydescription *entity = [nsentitydescription entityforname:@"songs" inmanagedobjectcontext:managedobjectcontext];     nsfetchrequest *request = [[nsfetchrequest alloc] init];      //here strlanguage string name of selected language     nspredicate * predicate  = [nspredicate predicatewithformat:@"language == %@",strlanguage];      [request setpredicate:predicate];     [request setentity:entity];      nsmutablearray* mutablefetchcategory = [[managedobjectcontext executefetchrequest:request error:&error] mutablecopy];  if ([mutablefetchcategory count] > 0)      {          (nsmanagedobject *info in mutablefetchcategory)         {              nslog(@"%@",info);              //extract data  each "info" object , store in array , display in tableview         } }  else  {     // repeat same code [or u can use functions reusability] language "english". }

you can refer link


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