如何使用Yii ActiveRecord關係？

Question

我怎麼能尋找這樣的SQL

select user.user_id,count(distinct user.user_id,user_lesson_read.lesson_id) as counter 
FROM 
user 
inner join 
user_lesson_read 
ON (user.user_id =user_lesson_read.user_id) 
GROUP BY user_lesson_read.user_id 
having counter >=3 

在人工魚礁？ 這是數據庫結構：

User 
-------------------- 
user_id  | 
1   | 
-------------------- 

LessonRead 
------------------------------------- 
user_id | lesson_id | section_id 
------------------------------------- 
1  | 2   | A 
------------------------------------- 
1  | 2   | B 
------------------------------------- 
1  | 3   | A 
------------------------------------- 
1  | 4   | A 
------------------------------------- 

用戶1有3條教訓記錄（教訓2,3,4）
我試着像

'userLessonRead'=>array(
      'select'=>'count(distinct t.user_id,t.lesson_id) as b', 
      //'condition'=>'', 
     ), 

一些事情，我會得到一個CDbException，和SQL是不正確的：

t.lesson_id) as b, // one parenthesis here 

任何人都可以幫助嗎？謝謝！

Answer 1

試試這個，

在用戶模式，

public function relations() 
{ 

     return array(
        "lessonread" => array(self::HAS_MANY,"LessonRead","user_id") 
     ); 
} 

在搜索（），

$criteria->with = array("user_lesson_read") 
$criteria->group = 'user_lesson_read.user_id'; 
$criteria->having = 'count(distinct t.user_id,t.lesson_id) > 3'; 

在LessonRead模型，

public function relations() 
{ 

     return array(
        "user" => array(self::BELONGS_TO,"User","user_id") 
     ); 
}