title: Why non-optional relationship is optional in Core Data?
body: <p>I set relationship be non-optional</p>
  
  <p><a href="https://i.stack.imgur.com/O5dwY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/O5dwY.png" alt="enter image description here"></a></p>
  
  <p>But generated <code>codegen</code> class / file contains optional.</p>
  
  <p><a href="https://i.stack.imgur.com/s5mit.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/s5mit.png" alt="enter image description here"></a></p>