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如何将来自外部源的数据作为 DocumentSet 返回?

我设置了一个自定义数据源来与亚马逊的产品广告 API 交互。为此,我按照文档 ( http://li3.me/docs/manual/working-with-data/creating-data-sources.wiki )lithium\data\source\Http中的描述对 read 方法进行了子类化和重新定义以满足我的需求。

但是,我的锂版本(0.11,最后一个版本)似乎没有像示例中那样的 cast 方法,如果我创建一个,它不会在我这样做时被调用return $this->item($model, $data, $options)

因此,我创建了一个自定义item函数来创建文档,parent::item就像文档示例对cast. 然后,在递归调用之后,我得到了一个Document 对象数组,最后一次调用parent::itemthen 给了我一个空的 DocumentSet 对象。我应该如何传递数据以创建正确的 DocumentSet?

这是我的代码的最小示例:

// Within class Amazon extends \lithium\data\source\Http

protected function _init() {
    // Define entity classes.
    $this->_classes += array(
        'entity' => 'lithium\data\entity\Document',
        'set' => 'lithium\data\collection\DocumentSet'
    );

    parent::_init();
}

public function read($query, array $options = array()) {
    // Extract from query object.
    $parameters = $query->export($this, array('keys' => array('conditions')));
    $conditions = $parameters['conditions'];

    // Code stripped to validate conditions and prepare Amazon request (that part works).
    // results in a $queryString variable.

    // Get response from Server.
    $xml = simplexml_load_string($this->connection->get($this->_config['basePath'], $queryString));

    // Stripped response validation and reformatting -> $items contains an array of SimpleXMLElement objects.

    return $this->item($query->model(), $items, array('class' => 'set'));
}

public function item($model, array $data = array(), array $options = array()) {
    // Recursively create Documents for arrays.
    foreach($data as $key => $value) {
        if(is_array($value)) {
            $data[$key] = $this->item($model, $value, array('class' => 'entity'));
        }
        else if(is_object($value) && get_class($value) == "SimpleXMLElement") {
            // Stripped code to extract data from XML object and put it in array $docData.

            $data[$key] = $this->item($model, $docData, array('class' => 'entity'));
        }
    }
    // Works perfectly for every (recursive) call with $options['class'] == 'entity' but fails for the final call with $options['class'] == 'set' (for this final call $data contains an array of Document objects).
    return parent::item($model, $data, $options);
}
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1 回答 1

1

我会跟踪主分支而不是发布版本。

在您的情况下,由于您是手动装箱对象,因此我会执行以下操作:

return $this->_instance('set', compact('data'));
于 2013-07-12T18:03:53.907 回答