protected function load_collection_from_cache( array $cached, Model $for ) {

		$models  = array();
		$removed = array();

		foreach ( $cached as $id ) {
			$model = $this->saver->get_model( $id );

			if ( $model ) {
				$models[ $id ] = $model;
			} else {
				$removed[] = $id;
			}
		}

		$diff = array_diff( $cached, $removed );
		wp_cache_set( $for->get_pk(), $diff, $this->get_cache_group() );

		return new Collection( $models, false, $this->saver );
	}