Что за бред с объектом??

получаю вполне привычный объект:

Код (PHP):

1. OldItems Object
2. (
3.     [_new:CActiveRecord:private] => 
4.     [_attributes:CActiveRecord:private] => Array
5.         (
6.             [items_id] => 153976
7.             [title] => Победа Филатова. Когда и баба Валя не спасла
8.             [annot] => Как прошел второй тур в Днепропетровске и что осталось з кадром
9.             [img_src2] => de24a9c-unian-672206.jpg
10.         )
11.  
12.     [_related:CActiveRecord:private] => Array
13.         (
14.             [struct] => OldStruct Object
15.                 (
16.                     [_new:CActiveRecord:private] => 
17.                     [_attributes:CActiveRecord:private] => Array
18.                         (
19.                             [alias] => article
20.                             [parent_id] => 415
21.                             [date] => 2015-11-17 00:14:36
22.                             [dir] => 564a554c7e42f
23.                             [struct_id] => 92156
24.                         )
25.  
26.                     [_related:CActiveRecord:private] => Array
27.                         (
28.                             [parent] => OldStruct Object
29.                                 (
30.                                     [_new:CActiveRecord:private] => 
31.                                     [_attributes:CActiveRecord:private] => Array
32.                                         (
33.                                             [dir] => politics
34.                                             [struct_id] => 415
35.                                         )
36.  
37.                                     [_related:CActiveRecord:private] => Array
38.                                         (
39.                                         )
40.  
41.                                     [_c:CActiveRecord:private] => 
42.                                     [_pk:CActiveRecord:private] => 415
43.                                     [_alias:CActiveRecord:private] => t
44.                                     [_errors:CModel:private] => Array
45.                                         (
46.                                         )
47.  
48.                                     [_validators:CModel:private] => 
49.                                     [_scenario:CModel:private] => update
50.                                     [_e:CComponent:private] => 
51.                                     [_m:CComponent:private] => 
52.                                 )
53.  
54.                         )
55.  
56.                     [_c:CActiveRecord:private] => 
57.                     [_pk:CActiveRecord:private] => 92156
58.                     [_alias:CActiveRecord:private] => t
59.                     [_errors:CModel:private] => Array
60.                         (
61.                         )
62.  
63.                     [_validators:CModel:private] => 
64.                     [_scenario:CModel:private] => update
65.                     [_e:CComponent:private] => 
66.                     [_m:CComponent:private] => 
67.                 )
68.  
69.             [author] => OldStruct Object
70.                 (
71.                     [_new:CActiveRecord:private] => 
72.                     [_attributes:CActiveRecord:private] => Array
73.                         (
74.                             [name] => Євген Будерацький
75.                             [struct_id] => 51021
76.                         )
77.  
78.                     [_related:CActiveRecord:private] => Array
79.                         (
80.                         )
81.  
82.                     [_c:CActiveRecord:private] => 
83.                     [_pk:CActiveRecord:private] => 51021
84.                     [_alias:CActiveRecord:private] => t
85.                     [_errors:CModel:private] => Array
86.                         (
87.                         )
88.  
89.                     [_validators:CModel:private] => 
90.                     [_scenario:CModel:private] => update
91.                     [_e:CComponent:private] => 
92.                     [_m:CComponent:private] => 
93.                 )
94.  
95.         )
96.  
97.     [_c:CActiveRecord:private] => 
98.     [_pk:CActiveRecord:private] => 153976
99.     [_alias:CActiveRecord:private] => t
100.     [_errors:CModel:private] => Array
101.         (
102.         )
103.  
104.     [_validators:CModel:private] => 
105.     [_scenario:CModel:private] => update
106.     [_e:CComponent:private] => 
107.     [_m:CComponent:private] => 
108. )
109.  

Как вы видите, объект имеет два свойства struct и author

А теперь вопрос: почему

Код (PHP):

1. var_dump($oldItems[0]->author); 

возвращает

Код (PHP):

1. NULL

??

В то время как

Код (PHP):

1. var_dump($oldItems[0]->struct); 

возвращает то, что нужно.