ios - Can't set relationship object to another object in CoreData -

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i have 2 entities: goal , category. added relationship "category" goal entity. want user can choose category list , category added relation goal object. getting error: -[__nssingleobjectseti managedobjectcontext]: unrecognized selector sent instance 0x138a22fa0

my code: 

- (bool)save {      // category object     nsmanagedobject *objcategory = [self getcategoryobjectwithid:@"1"];     if (!objcategory) {         nslog(@"error objcategory fetching!");         return;     }   nsentitydescription *entity =  [nsentitydescription entityforname:@"goal"                                                inmanagedobjectcontext:[coredatawrapper mymanagedcontext]];      nsmanagedobject *goal = [[nsmanagedobject alloc] initwithentity:entity insertintomanagedobjectcontext:[coredatawrapper mymanagedcontext]];     [goal setvalue:strid forkey:@"id"];     [goal setvalue:[nsset setwithobject:objcategory] forkey:@"category"]; // here error  return [coredatawrapper savemycontext];  }  - (nsmanagedobject *)getcategoryobjectwithid:(nsstring *)catid {      // fetching     nsfetchrequest *fetchrequest = [[nsfetchrequest alloc] initwithentityname:@"category"];     nspredicate *predicate = [nspredicate predicatewithformat:@"%k == %@", @"categoryid", catid];     [fetchrequest setpredicate:predicate];      // execute fetch request     nserror *fetcherror = nil;     nsarray *result = [[coredatawrapper mymanagedcontext] executefetchrequest:fetchrequest error:&fetcherror];      if (!fetcherror) {         return result[0];     }      return nil; }

i'm new coredata , maybe sort of dumb questions, followed many resourses , can't find what's problem.

if goal object can have 1 category, it's to-one relationship, meaning category property object, not set of objects (not set of 1 object).

you should set category :

[goal setvalue:objcategory forkey:@"category"];

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