seblucas / cops

    /**

     * @return Tag[]

     */

    public function getTags() {

        if (is_null ($this->tags)) {

            $this->tags = array();

            $result = parent::getDb()->prepare('select tags.id as id, name

                from books_tags_link, tags

                where tag = tags.id

                and book = ?

                order by name');

            $result->execute(array($this->id));

            while ($post = $result->fetchObject())

            {

                array_push($this->tags, new Tag($post));

            }

        }

        return $this->tags;

    }

    public function getTagsName() {

        return implode(', ', array_map(function ($tag) { return $tag->name; }, $this->getTags()));

    /**

     * @return Identifiers[]

     */

    public function getIdentifiers() {

        if (is_null ($this->identifiers)) {

            $this->identifiers = array();

            $result = parent::getDb()->prepare('select type, val, id

                from identifiers

                where book = ?

                order by type');

            $result->execute(array($this->id));

            while ($post = $result->fetchObject())

            {

                array_push($this->identifiers, new Identifier($post));

            }

        }

        return $this->identifiers;

    }

    /**

     * @return Data[]