Object Controllers
You’re still in MPRDocument.xib. Type array in the Object library’s search field, which should narrow the list down to “Array Controller,” an instance of NSArrayController, which is a kind of NSController that provides automated access to groups of objects. Drag the icon into the Editor view. The controller won’t show up in the view, but it will appear in the sidebar under a new category, Objects. This is not a placeholder—the controller is literally a part of the XIB.
Make sure the array controller is selected, and use the Attributes inspector to set Mode to Entity Name, and the Entity Name field to Team. Check Prepares Content, which tells the array controller that it is responsible for loading instances of the entity. (If ...
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