'VarName'=>array('RelationType', 'ClassName', 'ForeignKey', ...additional options)

'user' => array(self::BELONGS_TO, 'OaskUser', '' ,'on'=>'name=userName' , 'select'=>'TrueName'),
'varchar'=>array(self::HAS_ONE, 'CustomerEntityVarchar', 'entity_id','select'=>'varchar.value','on'=>'varchar.attribute_id="831"'),  

'detailCounts' => array(self::STAT, 'PurchaseDetail', 'purchase_hid'), 

1. classPostextendsCActiveRecord
   {
   ......
   publicfunction relations()
   {
   return array(
   'author'=>array(self::BELONGS_TO,'User','author_id'),
   'categories'=>array(self::MANY_MANY,'Category','tbl_post_category(post_id, category_id)'),
   );
   }
   }

class User extends CActiveRecord{  ......  public function relations(){  return array(  'posts'=>array(self::HAS_MANY, 'Post', 'author_id'),  );  }
}  

'Users' => array(self::MANY_MANY, 'User', 'fail_parts_user(fail_parts_id, user_id)'),

'FailParts' => array(self::MANY_MANY, 'FailParts', 'fail_parts_user(user_id, fail_parts_id)'), 

$users = As->VarName
foreach($users as $u){  $_tmp_users[] = $u -> getName;
}
userStr = implode(', ', $_tmp_users); 

// 获取 ID 为 10 的帖子
$post=Post::model()->findByPk(10);
// 获取帖子的作者(author): 此处将执行一个关联查询。
$author=$post->author;

$posts=Post::model()->with('author','categories')->findAll();
AR scopes//SchoolDepartment::model()->allDepartmentAndClass($id)->findAll();
public function relations()
{  return array(  'class' => array(self::HAS_MANY, 'SchoolClass', 'school_department_id'),  );
}  public function scopes() {  return array(  'allDepartmentAndClass',  );
}  public function allDepartmentAndClass($id) {  $this->getDbCriteria()->mergeWith(array(  'with' => "class",  'condition' => "t.tbl_school_id=$id",  ));  return $this;
} 

return array('reply' => array(self::BELONGS_TO, 'BookPostReply', 'postid'),
);

return array('reply' => array(self::BELONGS_TO, 'BookPostReply', '', 'on' => 'postid=postid'),
);

array(self::BELONGS_TO,'对应的模型',array('本模型的外键'=>'对应模型的主键'))

array('fkc1'=>'pkc1','fkc2'=>'pkc2')