objective c - iOS Core Data error - Unacceptable type of value for to-many relationship -


i'm tearing hair out issue, seems should simple. ios / objective c new me, maybe i'm not grasping fundamental.

the problem i've added new entity core data model, , set one-to-many relationship. model had 2 entities had one-to-one relationship.

core data model

the players entity new one.

i have uitableviewcontroller i'm saving attributes uitextfields. worked fine original configuration of teams/teamdetails, crashes out following error when add in players entity code:

terminating app due uncaught exception 'nsinvalidargumentexception',  reason:   'unacceptable type of value to-many relationship:  property = "playerdetails"; desired type = nsset; given type = players;

so, in save method, had:

teams *team = [nsentitydescription insertnewobjectforentityforname:@"teams" inmanagedobjectcontext:self.managedobjectcontext]; teamdetails *teamdetails = [nsentitydescription insertnewobjectforentityforname:@"teamdetails" inmanagedobjectcontext:self.managedobjectcontext];  team.teamdetails = teamdetails;

then go on set attributes like:

team.teamname = teamnametextfield.text; team.teamdetails.managername = managernametextfield.text;

which worked no problem. extend incorporate players entity:

players *playerdetails = [nsentitydescription insertnewobjectforentityforname:@"players" inmanagedobjectcontext:self.managedobjectcontext];  team.playerdetails = playerdetails;

and error above. i've tried following:

[team setplayerdetails:playerdetails];

but doesn't make difference. tried:

nsset *playerdetails = [nsentitydescription insertnewobjectforentityforname:@"players" inmanagedobjectcontext:self.managedobjectcontext];

but again, no difference - still thinks it's getting object of type players rather nsset.

i feel i'm not grasping simple, ge appreciated!

playerdetails to-many relationship, value of team.playerdetails set of players, not single player object. can either use

[team addplayerdetailsobject:playerdetails];

or more simply, using inverse relationship:

playerdetails.team = team;

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