{

public $book = null;

public $words = array();

public $word_idents = array();

public function getBook() {

$book = new Dase_DBO_Book($this->db);

$book->load($this->book_id);

$this->book = $book;

return $this->book;

}

public function getWords() {

$words = new Dase_DBO_Word($this->db);

$words->lesson_id = $this->id;

foreach ($words->findAll(1) as $word) {

if (!$word->sub_lesson) {

$word->sub_lesson = '0';

}

if (!isset($this->words[$word->sub_lesson])) {

$this->words[$word->sub_lesson] = array();

}

$this->words[$word->sub_lesson][] = $word;

$this->word_idents[] = $word->word_index.'.'.$word->sub_lesson;

}

return $this->words;

}