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The Comedy of Errors
Revision #7 was created by 
Ending ?> tag in non-view
Content
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In the model rules() method put:```php
array('foreingKey', 'exists', 'className' => 'SomeModel', 'attributeName' => 'id'),
```
Sure we have 'exists' method for CActiveRecord model, but ...
Ending ?> tag in non-view
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Extend a base class or edit a config file (needs to be included before the sessions starts) and leave a ?> at the ending with at least one trailing white space character. Make sure output buffering is off. Cry manly tears while trying to figure out why "Cannot modify header information - headers already sent" spams your log files.