public function testRelField()
 {
     $captain = $this->objFromFixture('DataObjectTest_Player', 'captain1');
     // Test traversal of a single has_one
     $this->assertEquals("Team 1", $captain->relField('FavouriteTeam.Title'));
     // Test direct field access
     $this->assertEquals("Captain", $captain->relField('FirstName'));
     $player = $this->objFromFixture('DataObjectTest_Player', 'player2');
     // Test that we can traverse more than once, and that arbitrary methods are okay
     $this->assertEquals("Team 1", $player->relField('Teams.First.Title'));
     $newPlayer = new DataObjectTest_Player();
     $this->assertNull($newPlayer->relField('Teams.First.Title'));
     // Test that relField works on db field manipulations
     $comment = $this->objFromFixture('DataObjectTest_TeamComment', 'comment3');
     $this->assertEquals("PHIL IS A UNIQUE GUY, AND COMMENTS ON TEAM2", $comment->relField('Comment.UpperCase'));
 }