         required:
           _id: @person2._id
           username: @person2.username
+          displayName: @person2.displayName
         optional:
           _id: @person3._id
           username: @person3.username

        required:
          _id: @person2._id
          username: @person2.username
        optional:
          _id: @person3._id
          username: @person3.username

        required:
          _id: @person2._id
          username: @person2.username
          displayName: @person2.displayName
        optional:
          _id: @person3._id
          username: @person3.username
