title: Cocoa: Core Data relationships not working
body: <p>I have a basic Core data model like this:</p>
  
  <p>Class</p>
  
  <p>-Class Name (string)</p>
  
  <p>Relationship: HasDetails (to many) -to Details</p>
  
  <p>Details</p>
  
  <p>-Number (int)</p>
  
  <p>-Name (string)</p>
  
  <p>Relationship: IsPartOfClass -to Class</p>
  
  <p>I have two table views, one for "Class" and one for "Details" and have all the bindings set up, however, when I add a new object to Details it shows up for all the Classes, when I want it to show up for only one, the selected one</p>