Collection::__call

public function __call($name, $arguments)
{
	$first3 = substr($name, 0, 3);
	$last4 = substr($name, -4);

	// group getter
	if ($first3 == 'get' && $last4 == 'List')
	{
		$fieldName = EntityObject::sysMethodToFieldCase(substr($name, 3, -4));

		if ($fieldName == '')
		{
			$fieldName = StringHelper::strtoupper($arguments[0]);

			// check if custom method exists
			$personalMethodName = $first3.EntityObject::sysFieldToMethodCase($fieldName).$last4;

			if (method_exists($this, $personalMethodName))
			{
				return $this->$personalMethodName(...array_slice($arguments, 1));
			}

			// hard field check
			$this->entity->getField($fieldName);
		}

		// check if field exists
		if ($this->_entity->hasField($fieldName))
		{
			return $this->sysGetList($fieldName);
		}
	}

	$last10 = substr($name, -10);

	if ($first3 == 'get' && $last10 == 'Collection')
	{
		$fieldName = EntityObject::sysMethodToFieldCase(substr($name, 3, -10));

		if ($fieldName == '')
		{
			$fieldName = StringHelper::strtoupper($arguments[0]);

			// check if custom method exists
			$personalMethodName = $first3.EntityObject::sysFieldToMethodCase($fieldName).$last10;

			if (method_exists($this, $personalMethodName))
			{
				return $this->$personalMethodName(...array_slice($arguments, 1));
			}

			// hard field check
			$this->entity->getField($fieldName);
		}

		// check if field exists
		if ($this->_entity->hasField($fieldName) && $this->_entity->getField($fieldName) instanceof Relation)
		{
			return $this->sysGetCollection($fieldName);
		}
	}

	$first4 = substr($name, 0, 4);

	// filler
	if ($first4 == 'fill')
	{
		$fieldName = EntityObject::sysMethodToFieldCase(substr($name, 4));

		// check if field exists
		if ($this->_entity->hasField($fieldName))
		{
			return $this->fill([$fieldName]);
		}
	}

	throw new SystemException(sprintf(
		'Unknown method `%s` for object `%s`', $name, get_called_class()
	));
}