title: NSmanagedObject copyWithZone issues
body: <p>I have a custom class Thing:NSManagedObject with an attribute of adminName.</p>
  
  <p>I am trying to create a copyWithZone function in this Thing class, but when I run the app it says setAdminName doesn't exist.</p>
  
  <p>In my implementation file I am using </p>
  
  <pre><code>@dynamic adminName;
  
  
  -(id) copyWithZone: (NSZone *) zone
  {
  Thing *regCopy = [[Thing allocWithZone: zone] init];
  regCopy.attendeeNum = [self adminName];
  
  return regCopy;
  }
  </code></pre>
  
  <p>I don't believe I can just change @dynamic to @synthesize since I am using Core Data. </p>