您可以使用离子授权中的 get_user_id（）函数来获取用户ID。在模型中的相关注释中，您需要一个 $ this-> db-> from（）调用来设置表以获取行数。

Provided the user is logged in you can get the user ID by using the get_user_id() function in ion auth. On a related note in your model you need a $this->db->from() call to set the table to fetch the number of rows from.

public function total_open_wo() {
  $userId = $this->ion_auth->get_user_id();
  $this->db->where('status', '1');
  $this->db->where('tid', $userId);
  $this->db->from('work_orders');
  $num = $this->db->count_all_results();

  return $num;
}

使用函数 $ this-> ion_auth- > logged_in（）以确保用户在调用模型函数之前已登录。

Use the function $this->ion_auth->logged_in() to make sure that the user is logged in before calling the model function.