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<?php
/**
* TActiveRecordBelongsTo class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2007 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Data.ActiveRecord.Relations
*/
/**
* Loads base active record relationship class.
*/
Prado::using('System.Data.ActiveRecord.Relations.TActiveRecordRelation');
/**
* Implements the foreign key relationship (TActiveRecord::BELONGS_TO) between
* the source objects and the related foreign object. Consider the
* <b>entity</b> relationship between a Team and a Player.
* <code>
* +------+ +--------+
* | Team | 1 <----- * | Player |
* +------+ +--------+
* </code>
* Where one team may have 0 or more players and each player belongs to only
* one team. We may model Team-Player <b>object</b> relationship as active record as follows.
* <code>
* class TeamRecord extends TActiveRecord
* {
* // see TActiveRecordHasMany for detailed definition.
* }
* class PlayerRecord extends TActiveRecord
* {
* const TABLE='player';
* public $player_id; //primary key
* public $team_name; //foreign key player.team_name <-> team.name
* public $age;
* public $team; //foreign object TeamRecord
*
* protected static $RELATIONS = array(
* 'team' => array(self::BELONGS_TO, 'TeamRecord'));
*
* public static function finder($className=__CLASS__)
* {
* return parent::finder($className);
* }
* }
* </code>
* The <tt>$RELATIONS</tt> static property of PlayerRecord defines that the
* property <tt>$team</tt> belongs to (or is a) <tt>TeamRecord</tt>s.
*
* The team object may be fetched as follows.
* <code>
* $players = PlayerRecord::finder()->with_team()->findAll();
* </code>
* The method <tt>with_xxx()</tt> (where <tt>xxx</tt> is the relationship property
* name, in this case, <tt>team</tt>) fetchs the corresponding TeamRecords using
* a second query (not by using a join). The <tt>with_xxx()</tt> accepts the same
* arguments as other finder methods of TActiveRecord, e.g.
* <tt>with_team('location = ?', 'Madrid')</tt>.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @version $Id$
* @package System.Data.ActiveRecord.Relations
* @since 3.1
*/
class TActiveRecordBelongsTo extends TActiveRecordRelation
{
/**
* Get the foreign key index values from the results and make calls to the
* database to find the corresponding foreign objects.
* @param array original results.
*/
protected function collectForeignObjects(&$results)
{
$fkObject = $this->getContext()->getForeignRecordFinder();
$fkeys = $this->findForeignKeys($this->getSourceRecord(),$fkObject);
$properties = array_keys($fkeys);
$fields = array_values($fkeys);
$indexValues = $this->getIndexValues($properties, $results);
$fkObjects = $this->findForeignObjects($fields, $indexValues);
$this->populateResult($results,$properties,$fkObjects,$fields);
}
/**
* Sets the foreign objects to the given property on the source object.
* @param TActiveRecord source object.
* @param array foreign objects.
*/
protected function setObjectProperty($source, $properties, &$collections)
{
$hash = $this->getObjectHash($source, $properties);
$prop = $this->getContext()->getProperty();
if(isset($collections[$hash]) && count($collections[$hash]) > 0)
{
if(count($collections[$hash]) > 1)
throw new TActiveRecordException('ar_belongs_to_multiple_result');
$source->{$prop} = $collections[$hash][0];
}
}
}
?>
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