/**
* @param string $class
* @param ORM $orm
* @throws SourceException
*/
public function __construct($class = null, ORM $orm = null)
{
if (empty($class)) {
if (empty(static::RECORD)) {
throw new SourceException("Unable to create source without associate class.");
}
$class = static::RECORD;
}
$this->class = $class;
$this->orm = $this->saturate($orm, ORM::class);
$this->setSelector($this->orm->selector($this->class));
}
/**
* Create selector dedicated to load data for current loader.
*
* @return RecordSelector|null
*/
public function createSelector()
{
if (!$this->isLoadable()) {
return null;
}
$selector = $this->orm->selector($this->definition[static::RELATION_TYPE], $this);
//Setting columns to be loaded
$this->configureColumns($selector);
foreach ($this->loaders as $loader) {
if ($loader instanceof self) {
//Allowing sub loaders to configure required columns and conditions as well
$loader->configureSelector($selector);
}
}
foreach ($this->joiners as $joiner) {
//Joiners must configure selector as well
$joiner->configureSelector($selector);
}
return $selector;
}
/**
* Internal ORM relation method used to create valid selector used to pre-load relation data or
* create custom query based on relation options.
*
* Must be redeclarated in child implementations.
*
* @return RecordSelector
*/
protected function createSelector()
{
return $this->orm->selector($this->getClass());
}
