活动记录不是唯一的表格问题

Question

我一直在

  

不唯一的表/别名：'users'

运行我的Active Record查询...

$this->db->select('*');
$this->db->from('faults');
$this->db->join('users','users.user_id = faults.customer_id');
$this->db->join('users','users.user_id = faults.engineer_id', 'left outer');
$this->db->where('faults.fault_id', $fault_id);

其翻译为（在MySQL中）：

SELECT * FROM (`faults`) JOIN `users` ON `users`.`user_id` = `faults`.`customer_id` LEFT OUTER JOIN `users` ON `users`.`user_id` = `faults`.`engineer_id` WHERE `faults`.`fault_id` = '1'

我看过this answer，但不知道如何将其转换为我的有效记录查询？

任何帮助表示感谢。

干杯

Answer 1

您需要添加别名'...

$this->db->select('*');
$this->db->from('faults AS F0');
$this->db->join('users' AS U0, 'U0.user_id = F0.customer_id');
$this->db->join('users' AS U1, 'U1.user_id = F0.engineer_id', 'left outer');
$this->db->where('F0.fault_id', $fault_id);

Answer 2

private $_fautls_table = 'fautls';

$this->db->from('fautls as f')
$this->db->join($this->_users_table . ' AS u', 'u.user_id = f.customer_id'); 
$this->db->join($this->_users_table . ' AS uu', 'uu.users_id = f.engineering_id');