Core Data - action before remove an instance of an entity


hello!

i've problem.
i've 3 entities: billofsale, product, item.

when remove instance of item entity want decrement total field (attribiute in billofsale entity). wrote custom class: itemmo increment total fileld using reletionship:

code:
  [self setvalue: sum forkeypath:@"billofsale.total"];
i call function when change quantity or product , it's working.
don't know method called when instance of entity being removed.
in interface bind "delete item" button itemscontroller (nsaraycontroller item entity) remove action.

i'm looking awakefrominsert method can't find it.

please me :(
 

i assume object removed in ui, create custom remove method checked sum value manually. i'd call method instead of remove on nsarraycontroller.

you'll have remove object manually nsmanagedobjectcontext using [context deleteobject:obj]; obj object in question.
 


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