ios - Core Data to-one relationship returns NULL -

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the batting.team relationship doesn't save , returns null sometimes

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about 100 'team' nsmanagedobjects saved , can log attributes expected. 15000 'batting' nsmanagedobjects saved , attributes log correctly except relationship.

i want batting.team relationship point team object has same team.teamid value batting.teamid.

when setting batting relationship, create predicate search specific team.teamid, fetch request , supposedly set team object equal batting.team relationship. relationship attribute gets set times doesn't , can't figure out 

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {     // override point customization after application launch.      nserror *error;      nsstring* datapath_teams = [[nsbundle mainbundle] pathforresource:@"teams" oftype:@"json"];     nsarray* teams = [nsjsonserialization jsonobjectwithdata:[nsdata datawithcontentsoffile:datapath_teams] options:kniloptions error:&error];         nsstring* datapath_abc = [[nsbundle mainbundle] pathforresource:@"abc" oftype:@"json"];     nsarray* batting_abc = [nsjsonserialization jsonobjectwithdata:[nsdata datawithcontentsoffile:datapath_abc] options:kniloptions error:&error];        //insert team objects     nsfetchrequest *fetchrequestteams = [[nsfetchrequest alloc] init];     nsentitydescription *entityteams = [nsentitydescription entityforname:@"team" inmanagedobjectcontext:self.managedobjectcontext];     [fetchrequestteams setentity:entityteams];      (id t in teams) {         team *team = [nsentitydescription insertnewobjectforentityforname:@"team" inmanagedobjectcontext:self.managedobjectcontext];          team.name       = [t objectforkey:@"name"];         team.minyearid  = [t objectforkey:@"minyearid"];         team.maxyearid  = [t objectforkey:@"maxyearid"];         team.teamid     = [t objectforkey:@"teamid"];          if (![self.managedobjectcontext save:&error]) {             nslog(@"whoops, couldn't save: %@", [error localizeddescription]);         }     }     nsarray *fetchedobjectsteams = [self.managedobjectcontext executefetchrequest:fetchrequestteams error:&error];     nslog(@"number of records in teams.json - %d", (int)[fetchedobjectsteams count]);       //insert batting objects     nsfetchrequest *fetchrequestbatting = [[nsfetchrequest alloc] init];     nsentitydescription *entitybatting = [nsentitydescription entityforname:@"batting" inmanagedobjectcontext:self.managedobjectcontext];     [fetchrequestbatting setentity:entitybatting];      (id b in batting_abc) {         batting *batting = [nsentitydescription insertnewobjectforentityforname:@"batting" inmanagedobjectcontext:self.managedobjectcontext];          batting.playerid    = [b objectforkey:@"playerid"];         batting.h           = [b objectforkey:@"h"];         batting.ab          = [b objectforkey:@"ab"];         batting.hr          = [b objectforkey:@"hr"];         batting.rbi         = [b objectforkey:@"rbi"];         batting.sb          = [b objectforkey:@"sb"];         batting.r           = [b objectforkey:@"r"];         batting.bb          = [b objectforkey:@"bb"];         batting.so          = [b objectforkey:@"so"];         batting.yearid      = [b objectforkey:@"yearid"];         batting.teamid      = [b objectforkey:@"teamid"];          nspredicate *teamidpredicate = [nspredicate predicatewithformat:@"teamid == %@", [b objectforkey:@"teamid"]];         [fetchrequestteams setpredicate:teamidpredicate];         nsarray *fetchedspecificteam = [self.managedobjectcontext executefetchrequest:fetchrequestteams error:&error];          batting.team = [fetchedspecificteam firstobject];          if (![self.managedobjectcontext save:&error]) {             nslog(@"whoops, couldn't save: %@", [error localizeddescription]);         }     }      fetchedobjectsbatting = [self.managedobjectcontext executefetchrequest:fetchrequestbatting error:&error];     (batting *b in fetchedobjectsbatting) {         nslog(@"playerid:   %@", b.playerid);         nslog(@"yearid:     %@", b.yearid);         nslog(@"teamid:     %@", b.teamid);         nslog(@"team:       %@\n\n", b.team.name);     }      return yes; }

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from screenshot of model, configured each team can have 1 batting. each time set batting.team given team, coredata remove link team current batting object (thereby setting batting object's team nil).

you should define team entity's batting relationship "to-many" (each team can have many battings) using data model inspector on right hand side when in model editor:

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