fuel/fuel/packages/orm/classes/observer/updatedat.php
protected function relation_changed(Model $obj, $relation)
	{
		// Check that the relation exists
		if ($obj->relations($relation) === false)
		{
			throw new \InvalidArgumentException('Unknown relation '.$relation);
		}

		// If the relation is not loaded then ignore it.
		if ( ! $obj->is_fetched($relation))
		{
			return false;
		}

		$relation_object = $obj->relations($relation);

		// Check if whe have a singular relation
		if ($relation_object->is_singular())
		{
			// If so check that one model
			return $obj->{$relation}->is_changed();
		}

		// Else we have an array of related objects so start checking them all
		foreach ($obj->{$relation} as $related_model)
		{
			if ($related_model->is_changed())
			{
				return true;
			}
		}

		return false;
	}
protected function relation_changed(Model $obj, $relation)
	{
		// Check that the relation exists
		if ($obj->relations($relation) === false)
		{
			throw new \InvalidArgumentException('Unknown relation '.$relation);
		}

		// If the relation is not loaded then ignore it.
		if ( ! $obj->is_fetched($relation))
		{
			return false;
		}

		$relation_object = $obj->relations($relation);

		// Check if whe have a singular relation
		if ($relation_object->is_singular())
		{
			// If so check that one model
			return $obj->{$relation}->is_changed();
		}

		// Else we have an array of related objects so start checking them all
		foreach ($obj->{$relation} as $related_model)
		{
			if ($related_model->is_changed())
			{
				return true;
			}
		}

		return false;
	}
protected function relation_changed ( Model $ obj , $ relation ) { // Check that the relation exists if ( $ obj -> relations ( $ relation ) === false ) { throw new \ InvalidArgumentException ( 'Unknown relation ' . $ relation ) ; } // If the relation is not loaded then ignore it. if ( ! $ obj -> is_fetched ( $ relation ) ) { return false ; } $ relation_object = $ obj -> relations ( $ relation ) ; // Check if whe have a singular relation if ( $ relation_object -> is_singular ( ) ) { // If so check that one model return $ obj -> { $ relation } -> is_changed ( ) ; } // Else we have an array of related objects so start checking them all foreach ( $ obj -> { $ relation } as $ related_model ) { if ( $ related_model -> is_changed ( ) ) { return true ; } } return false ; }
Checks to see if any models in the given relation are changed. This function is lazy so will return true as soon
as it finds something that has changed.

@param Model  $obj
@param string $relation

@return bool
Checks to see if any models in the given relation are changed . This function is lazy so will return true as soon as it finds something that has changed .