每个通过“入门”教程开始学习ZF2的人都会知道模型类Album（下面的s。）。
现在我想用歌曲扩展我的模型。一张专辑可以有0首或更多首歌曲。这些歌曲将获得新的标记songs（id，title，album_id）和映射器Album\Model\Song。映射器Album\Model\Song的构建方式与Album\Model\Album类似。映射器Album\Model\Album将获得一个新属性songCollection（Album\Model\Song个对象的数组，或类似Album\Model\SongCollection对象的内容。
InputFilter用于“嵌套”（映射器）类？getInputFilter()？setInputFilter()？好的，现在根本没有实现。但是很清楚如何为浅层结构做这件事 - 并且不清楚如何为映射器实现它，引用另一个映射器（-s）。 Album\Model\Album
<?php
namespace Album\Model;
use Zend\Stdlib\ArraySerializableInterface;
use Zend\InputFilter\Factory as InputFactory;
use Zend\InputFilter\InputFilter;
use Zend\InputFilter\InputFilterAwareInterface;
use Zend\InputFilter\InputFilterInterface;
class Album implements InputFilterAwareInterface, ArraySerializableInterface {
public $id;
public $artist;
public $title;
protected $inputFilter;
public function exchangeArray(array $data) {
$this->id = (isset($data['id'])) ? $data['id'] : null;
$this->artist = (isset($data['artist'])) ? $data['artist'] : null;
$this->title = (isset($data['title'])) ? $data['title'] : null;
}
public function toArray() {
return $this->getArrayCopy();
}
public function getArrayCopy() {
return get_object_vars($this);
}
public function setInputFilter(InputFilterInterface $inputFilter) {
throw new \Exception('Not used');
}
public function getInputFilter() {
if (!$this->inputFilter) {
$inputFilter = new InputFilter();
$factory = new InputFactory();
$inputFilter->add($factory->createInput(array(
'name' => 'id',
'required' => true,
'filters' => array(
array('name' => 'Int')
)
)));
$inputFilter->add($factory->createInput(array(
'name' => 'artist',
'required' => true,
'filters' => array(
array('name' => 'StripTags'),
array('name' => 'StringTrim')
),
'validarots' => array(
array(
'name' => 'StringLength',
'options' => array(
'encoding' => 'UTF-8',
'min' => 1,
'max' => 100
)
)
)
)));
$inputFilter->add($factory->createInput(array(
'name' => 'title',
'required' => true,
'filters' => array(
array('name' => 'StripTags'),
array('name' => 'StringTrim')
),
'validarots' => array(
array(
'name' => 'StringLength',
'options' => array(
'encoding' => 'UTF-8',
'min' => 1,
'max' => 100
)
)
)
)));
$this->inputFilter = $inputFilter;
}
return $this->inputFilter;
}
}
答案 0 :(得分：1)
我认为你对这个例子中列出的模型和映射器的关系有点困惑。
'mappers'将是TableGateway对象，例如AlbumTable，SongTable等。专辑和歌曲类可以调用模型或域对象，它们代表应用程序中的实际实体。 Mappers只需要将它们保存在您的数据库等中。
当使用TableGateway实现时，我会让每个域对象（例如Ablum）处理它的TableGateway将要保留的属性的InputFilter（例如AlbumTable）。
对于您所说的示例，我根本不会更改Album Models InputFilter。原因是与歌曲的关系是：
Album HAS many songs, Song Belongs to Album (the Song would have the link back to the Album)
添加新的歌曲对象和网关：
<?php
namespace Album\Model;
use Zend\Stdlib\ArraySerializableInterface;
use Zend\InputFilter\Factory as InputFactory;
use Zend\InputFilter\InputFilter;
use Zend\InputFilter\InputFilterAwareInterface;
use Zend\InputFilter\InputFilterInterface;
class Song implements InputFilterAwareInterface, ArraySerializableInterface {
protected $id;
protected $album;
protected $title;
protected $inputFilter;
// Added Getters / Setters for the attributes rather than
// having public scope ...
public function setAlbum(Album $album)
{
$this->album = $album;
}
public function getAlbum()
{
return $this->album;
}
public function exchangeArray(array $data) {
$this->id = (isset($data['id'])) ? $data['id'] : null;
$this->title = (isset($data['title'])) ? $data['title'] : null;
if(isset($data['album_id'])) {
$album = new Album();
$album->exchangeArray($data['album_id']);
$this->setAlbum($album);
}
}
public function toArray() {
return $this->getArrayCopy();
}
public function getArrayCopy() {
return array(
'id' => $this->id,
'album_id' => $this->getAlbum()->id,
'title' => $this->title,
);
}
public function setInputFilter(InputFilterInterface $inputFilter) {
throw new \Exception('Not used');
}
public function getInputFilter() {
if (!$this->inputFilter) {
$inputFilter = new InputFilter();
$factory = new InputFactory();
$inputFilter->add($factory->createInput(array(
'name' => 'id',
'required' => true,
'filters' => array(
array('name' => 'Int')
)
)));
$inputFilter->add($factory->createInput(array(
'name' => 'album_id',
'required' => true,
'filters' => array(
array('name' => 'Int')
)
)));
$inputFilter->add($factory->createInput(array(
'name' => 'title',
'required' => true,
'filters' => array(
array('name' => 'StripTags'),
array('name' => 'StringTrim')
),
'validarots' => array(
array(
'name' => 'StringLength',
'options' => array(
'encoding' => 'UTF-8',
'min' => 1,
'max' => 100
)
)
)
)));
$this->inputFilter = $inputFilter;
}
return $this->inputFilter;
}
}
请注意，无需更改专辑模型，因为关系是“歌曲属于专辑”。
当您的对象关系变得更复杂时，您会想要使用Hydrator为您构建对象（http://framework.zend.com/manual/2.0/en/modules/zend.stdlib.hydrator.html）
现在您将创建一个SongTable来为您保留这个新对象：
<?php
namespace Album\Model;
use Zend\Db\TableGateway\TableGateway;
class SongTable
{
protected $tableGateway;
public function __construct(TableGateway $tableGateway)
{
$this->tableGateway = $tableGateway;
}
public function fetchAll()
{
$resultSet = $this->tableGateway->select();
return $resultSet;
}
public function getSong($id)
{
$id = (int) $id;
$rowset = $this->tableGateway->select(array('id' => $id));
$row = $rowset->current();
if (!$row) {
throw new \Exception("Could not find row $id");
}
return $row;
}
public function saveSong(Song $song)
{
$data = array(
'album_id' => $song->getAlbum()->id,
'title' => $song->title,
);
$id = (int)$song->id;
if ($id == 0) {
$this->tableGateway->insert($data);
} else {
if ($this->getSong($id)) {
$this->tableGateway->update($data, array('id' => $id));
} else {
throw new \Exception('Form id does not exist');
}
}
}
public function fetchAlbumSongs(Album $album)
{
$resultSet = $this->tableGateway->select(array(
'album_id' => $album->id
));
return $resultSet;
}
public function addSongsToAlbum(Album $album)
{
foreach($this->fetchAlbumSongs($album) as $song) {
$album->addSong($song);
}
}
}
然后，您可以修改相册模型以允许添加歌曲：
class Album implements InputFilterAwareInterface, ArraySerializableInterface {
// Other stuff here
/**
* @var array
*/
protected $songs = array();
public function addSong(Song $song)
{
$this->songs[] = $song;
}
public function getSongs()
{
return $this->songs;
}
}
然后你可以轻松地构建你的对象图，我通常会让服务器做这样的事情：
AlbumService.php
public function getAlumbWithSongs(int $id)
{
$album = $this->getAlbumTable()->getAlbum($id);
if($album) {
$this->getSongTable()->addSongsToAlbum($album);
}
return $album;
}