Why is awakeFromInsert called twice?

Question

I have implemented awakeFromInsert to set some default values and relationships in my core data objects. However, the method is being called twice, meaning that

Answer 1

thanks to jrturton help:

here is the simplest one: when parentContext is null, means when this context is saved you can do you custom logic, for example incrementing table number

- (void)awakeFromInsert
 {

     if (!self.managedObjectContext.parentContext) {
         //setting tableNumber

         [self willChangeValueForKey:@"number"];
         [self setPrimitiveNumber:tableNumber];
         [self didChangeValueForKey:@"number"];
    }

 }