/**
* Returns the data model based on the primary key given in the GET variable.
* If the data model is not found, an HTTP exception will be raised.
* @param integer the ID of the model to be loaded
*/
public function loadModel($id)
{
$model = Credits::model()->findByPk($id);
if ($model === null) {
throw new CHttpException(404, 'The requested page does not exist.');
}
return $model;
}
public static function deduct($user_id, $amount, $item_id)
{
$user_id = (int) $user_id;
if (self::checkBalance($user_id, $item_id)) {
$transaction = Yii::app()->db->beginTransaction();
$history = new CreditsHistory();
$credit = Credits::model()->find('user_id = :user_id', array(':user_id' => $user_id));
try {
$history_data = array('user_id' => $user_id, 'credit_item_id' => $item_id, 'type' => 'deduction', 'value' => $amount);
$history->attributes = $history_data;
$history->save();
$new_balance = $credit->balance - $amount;
$credit_data = array('balance' => $new_balance);
$credit->attributes = $credit_data;
$credit->save();
$transaction->commit();
} catch (Exception $e) {
$transaction->rollback();
}
return true;
}
return false;
}
