/**
* Collection initializer
*
* @param array $from Array of model objects of the same class
* @param string $class Optional classname of the desired objects
* @param string $class Optional column name of the primary key
*
* @return DbFinder a finder object
* @throws Exception If the array is empty, contains not model objects or composite objects
*/
public static function fromCollection($collection, $class = '', $pkName = '')
{
if (count($collection) == 0) {
if (!$class) {
throw new Exception('A DbFinder cannot be initialized with an empty array and no class');
} else {
return self::fromClass($class);
}
}
$testObject = $collection[0];
if ($testObject instanceof BaseObject) {
$finder = sfPropelFinder::fromCollection($collection, $class, $pkName);
} else {
if ($testObject instanceof Doctrine_Record) {
$finder = sfDoctrineFinder::fromCollection($collection, $class, $pkName);
} else {
throw new Exception('A DbFinder can only be initialized from an array of Propel or Doctrine objects');
}
}
if (class_exists($finderClass = get_class($testObject) . 'Finder')) {
$dbFinder = new $finderClass();
$dbFinder->setQueryObject($finder->getQueryObject());
} else {
$me = __CLASS__;
$dbFinder = new $me($finder);
}
return $dbFinder;
}
