Codeigniter / Datamapper無法正確生成關系查詢

Question

我有一個使用Codeigniter / Datamapper的應用程序。 有一個醫生表，一個有專科表和模型，它們之間建立了多對多關系。

我注意到，嘗試按專業查詢醫生只會導致查詢所有醫生。 有人遇到過這個問題嗎？ 這是我正在使用的代碼：

$s = new Specialty();
$s->where('id',$id)->get(); //thought maybe get_by_id($id) was causing the issue, it wasnt...
$this->out['query'] = $s->doctor->order_by('last_name','asc')->get_sql();
$docs = $s->doctor->order_by('id')->get_iterated();

$ this-> out ['query']響應以下SQL查詢：

"SELECT * FROM (`doctors`) ORDER BY `doctors`.`last_name` asc"

另一個奇怪的是，結果並沒有按last_name的順序返回，但是我假設它是如何將數組傳遞給json_encode函數的。

Answer 1

您需要在get_sql方法中添加一些參數，因為您正在相關對象上使用此參數。

從文檔 ：

$object->get_sql()

This method returns the SQL for the currently built query, as if get() was called. It clears the current query immediately.

Arguments

$limit: (Optional) Sets the limit on the query.
$offset: (Optional) Sets the offset on the query.
$handle_related: (Optional) If TRUE, and this object is referenced from a parent object, the parent object will automatically to the where statement.


$u = new User();
$u->where('name', 'Bob');
echo $u->get_sql();
// outputs the raw SQL
Example with relationship
$group = new Group(1); // load Group #1

echo $group->user->get_sql();
// SELECT `users`.*
// FROM `users`

echo $group->user->get_sql(NULL, NULL, TRUE);
// SELECT `users`.*
// FROM `users`
// LEFT OUTER JOIN `groups` groups ON `users`.`group_id` = `groups.id`
// WHERE `groups`.`id` = 1

因此，您需要執行以下操作以輸出正確的查詢：

$this->out['query'] = $s->doctor->order_by('last_name','asc')->get_sql(NULL, NULL, TRUE);