public function testSave()
{
$nid = mt_rand(0, 999999);
for ($i = 0; $i < 10; $i++) {
$book = new Book(array('name' => 'test_save', 'nid' => $nid));
$book->save();
}
$books = Book::find(array('nid' => $nid));
$books->map(function ($book) {
$book->age = 10;
return $book;
})->save();
$this->assertEquals(10, $books->get(0)->age);
$books = Book::find(array('nid' => $nid));
$this->assertEquals(10, $books->get(0)->age);
}
