[英]Kohana ORM custom methods in models
I have these two models: 我有这两个模型:
class Model_user extends ORM { protected $_has_many = array('credits', array('model'=>'credit', 'foreign_key'=>'user')); } class Model_credit extends ORM { protected $_belongs_to = array('user', array('model'=>'user', 'foreign_key'=>'user')); protected $_tb = 'credits'; protected $_pk = 'id'; // method to be implemented public function total() { return $total_credits_available; } } // accessing the 'total' method $user = ORM::factory('user', 1); $total_credits = $user->credits->total();
The thing is how to implement the 'total' method, which does something like: 问题是如何实现'total'方法,它具有以下特点:
return DB::select(array(DB::expr('SUM(qty * sign)'), 'total')) ->from($this->_tb) ->where('user', '=', $user_id) ->execute() ->total;
The method counts users's credits (it can be +credits and -credits) and return the total amount of credits available. 该方法计算用户的信用(可以是+信用和 - 信用)并返回可用信用总额。 As long as I use ORM::factory method to create the user object, I'd like to implement the 'total' method in such manner it uses loaded resources rather than running a new query (I wrote the above query to demonstrate the business logic).
只要我使用ORM :: factory方法创建用户对象,我就想以这样的方式实现'total'方法,它使用加载的资源而不是运行新的查询(我写了上面的查询来演示业务逻辑)。
Any suggestions? 有什么建议? :)
:)
<?php
class Model_user extends ORM {
protected static $_totals = array();
protected $_has_many = array('credits', array('model'=>'credit', 'foreign_key'=>'user'));
public function total()
{
$total = Arr::get(Model_User::$_totals, $this->id, FALSE);
if ($total !== FALSE)
return $total;
return Model_User::$_totals[$this->id] = $this->credits
->select(array(DB::expr('SUM(qty * sign)'), 'total'))
->find()
->total;
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.