ios - deleting records that has recursive relationships in coredata -

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i have below relationship in model. userstatement has levelupstatement , parentstatement has a-to 1 relationship between. problem have when try delete levelupstatement. have nullify both end of relationship , when try delete below: (mainuserstatement parentstatement)

self.mainuserstatementmodel.levelupstatement = nil; self.mainuserstatementmodel.levelupterm = nil; [[ashcoredatastack defaultstack].managedobjectcontext deleteobject:self.mainuserstatementmodel.levelupstatement];  error getting is:        terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-deleteobject: requires non-nil argument'.

i know managedobjectcontext exists. problem should not there. how can safely delete levelupstatement without effecting levelupterm , parentstatement?

core data model

you need change order of lines of code:

[[ashcoredatastack defaultstack].managedobjectcontext deleteobject:self.mainuserstatementmodel.levelupstatement]; self.mainuserstatementmodel.levelupstatement = nil; self.mainuserstatementmodel.levelupterm = nil;

in fact, if parentstatement relationship set 'nullify' not need second of these lines: coredata automatically nil out levelupstatement. check relationship in data model inspector:

enter image description here


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