title: Why can't I save NSSet to 'to-many' relationship in coredata?
body: <p>In one of my core data entities I have a one to many relationship with another entity.
  Say my family Entity has a to-many relationship with person.</p>
  
  <p>I can create families and persons no problem. but when I do a:</p>
  
  <pre><code>self.myFamily.people = [NSSet setWithArray:myPersonArray];
  </code></pre>
  
  <p>There doesn't seem to be a set assigned to the relationship 'people'.
  I'm currently re-factoring some code away from the viewcontrollers into a singleton. Could this possible have anything to do with it? I can save all other object, I can create and delete managed objects I just can't assign a set of objects to a relationship!</p>