ios - non-optional relations one-to-one failed to save with 1570 error sometimes -

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i have task , person classes. task has relationship one-to-one person, relation called "assignee". have nsmanagedobject inheritors both classes. getting instance of person (with aid of nsfetchrequest), , create new task (with nsentitydescription), , 

task.assignee = person; [context save:&error];

some times saves, of time getting “cocoa error 1570” saying "assignee" null!

how be?

  • i added assert(task.assignee) before saving
  • i check [task validateforinsert:&error]; , error empty!!
  • i using same context fetched person second ago
  • nobody touches in background

and funniest thing: when check "optional" in relation, works! saves correct data: task person.

is bug or what?

looks did stupid threading mistake.

i had context nsprivatequeueconcurrencytype, , used objects obtained on main thread, not allowed (managed objects not thread safe). should switch nsmainqueueconcurrencytype or use managedobjectid refetch objects different context (on correct thread).


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