我正在 cakePHP 中集成 freshbooks 插件，我遇到的上述问题为：`
Call to undefined method Xml::toString()`
数据源中的我的代码 ->FreshBooksSource.php
App::uses('HttpSocket', 'Network/Http');
$HttpSocket = new HttpSocket();
class FreshbookSource extends DataSource {
/**
* description
* @var string
*/
public $description = 'Freshbooks DataSource';
/**
* config
* @var array
*/
public $config = array(
'subdomain' => '',
'token' => '',
/**
* cache
* true = use freshbooks cache
* false = disable cache
* 'cache-name' = cache config to use
*/
'cache' => true,
);
/**
* http
* @var object
*/
public $http = null;
/**
* url
* @var string
*/
public $url = null;
/**
* __requestXml
* Stores the last sent xml string
* @var string
*/
private $__requestXml = null;
/**
* __responseXml
* Stores the last received xml string
* @var string
*/
private $__responseXml = null;
/**
* __construct
* @param array $config
*/
public function __construct($config) {
$this->init($config);
parent::__construct($config);
}
/**
* init
* Inits the socket, url and cache.
*
* @param array $config
* @return bool
*/
public function init($config=null) {
$this->config = array_merge($this->config, (array)$config);
if (!class_exists('HttpSocket') || !class_exists('Xml')) {
App::import('Core', array('HttpSocket', 'Xml'));
}
$this->http = new HttpSocket();
$this->url = 'https://'.$this->config['subdomain'].'.freshbooks.com/api/2.1/xml-in';
if ($this->config['cache'] === true) {
Cache::config('freshbooks', array('engine'=> 'File', 'prefix' => 'freshbooks_'));
$this->config['cache'] = 'freshbooks';
}
return true;
}
/**
* read
* Handles list and get sub methods.
*
* @access public
* @param object $model
* @param array $data
* @return array
*/
public function read(&$model, $data=array()) {
$method = (isset($model->method)) ? $model->method : Inflector::underscore($model->alias);
$params = array();
if (isset($data['conditions'][$model->alias.'.'.$model->primaryKey])) {
$model->id = $data['conditions'][$model->alias.'.'.$model->primaryKey];
}
if (isset($data['conditions'][$model->primaryKey])) {
$model->id = $data['conditions'][$model->primaryKey];
}
if ($model->id !== false) {
$submethod = 'get';
$params[$model->primaryKey] = $model->id;
} else {
$submethod = 'list';
$params['per_page'] = (!empty($data['limit'])) ? $data['limit'] : 100;
$params['page'] = (!empty($data['page'])) ? $data['page'] : 1;
$params = Set::merge((array)$data['conditions'], $params);
}
$hash = $method.'_'.$submethod.'_'.implode('_', array_merge(array_keys($params), array_values($params)));
$hash = hash('md4', $hash);
if (($res = Cache::read($hash, $this->config['cache'])) === false || $this->config['cache'] === false) {
$params = array_map(create_function('$a', 'return array($a);'), $params);
$xml =& new Xml(array('Request' => array('method' => $method.'.'.$submethod)+$params));
$this->__requestXml = $xml->toString(array('header' => true));
$res = $this->_parseResponse(
$this->http->get($this->url, null, array_merge(
$this->__getAuthArray(),
array('body' => $this->__requestXml)
)
));
if ($this->config['cache'] !== false) {
if (isset($model->cache)) {
Cache::set($model->cache);
}
Cache::write($hash, $res, $this->config['cache']);
}
}
if ($res === false) {
return array();
}
$findTable = Inflector::camelize($model->useTable);
$findAlias = $model->alias;
if ($data['fields'] == 'count') {
if ($submethod == 'get') {
$res = array(array(array('count' => 1)));
} else {
$res = array(array(array('count' => current(Set::extract('/Response/'.$findTable.'/total', $res)))));
}
} elseif ($submethod == 'get') {
$this->_formatResponse($res);
$res = array(array($model->alias => current(Set::extract('/Response/'.$findAlias.'/.', $res))));
} else {
$this->_formatResponse($res, 3);
// MEH, ALMOST A HACKLESS DATASOURCE
if ($model->alias == 'Staff') {
$res = Set::extract('/Response/'.$findTable.'/Member', $res, array('flatten' => false));
foreach ($res as $key => $val) {
$res[$key]['Staff'] = $val['Member'];
unset($res[$key]['Member']);
}
} else {
$res = Set::extract('/Response/'.$findTable.'/'.$findAlias, $res, array('flatten' => false));
}
}
return $res;
}
/**
* query
* Give outside access to things in datasource.
*
* @param string $query
* @param array $data
* @param object $model
* @return mixed
*/
public function query($query=null, $data=null, &$model=null) {
if (strpos(strtolower($query), 'findby') === 0) {
$field = Inflector::underscore(preg_replace('/^findBy/i', '', $query));
if ($field == 'id') {
$field = $model->primaryKey;
}
return $model->find('first', array(
'conditions' => array(
$field => current($data),
),
));
}
if (strtolower($query) == 'freshbooks') {
$this->__requestXml = current($data);
$res = $this->_parseResponse(
$this->http->get($this->url, null, array_merge(
$this->__getAuthArray(),
array('body' => $this->__requestXml)
)
));
if ($res === false) {
return false;
}
$this->_formatResponse($res);
return $res;
}
if (strtolower($query) == 'requestxml') {
return $this->__requestXml;
}
if (strtolower($query) == 'responsexml') {
return $this->__responseXml;
}
throw new Exception(__d('freshbooks', 'Sorry, that find method is not supported.', true));
}
/**
* create
* Handles create and update sub methods.
*
* @access public
* @param object $model
* @param array $fields
* @param array $values
* @return boolean
*/
public function create(&$model, $fields=null, $values=null) {
$method = (isset($model->method)) ? $model->method : Inflector::underscore($model->alias);
$data = array_combine((array)$fields, (array)$values);
if (isset($data[$model->primaryKey])) {
$model->id = $data[$model->primaryKey];
unset($data[$model->primaryKey]);
}
if ($model->id !== false) {
$submethod = 'update';
$data[$model->primaryKey] = $model->id;
} else {
$submethod = 'create';
}
$xml =& new Xml(array('Request' => array('method' => $method.'.'.$submethod)));
$node =& new Xml(array($method => array()));
foreach ($data as $key => $val) {
if (is_array($val)) {
$singular = Inflector::singularize($key);
$val = array($key => array($singular => $val));
@$node->first()->append($val, array('format' => 'tags'));
unset($data[$key]);
} elseif (substr($val, 0, 1) == '<') {
$my_node =& new Xml($val);
@$node->first()->append($my_node->children);
unset($data[$key]);
} else {
$my = array($key => array(array($val)));
@$node->first()->append($my);
}
}
$xml->first()->append($node->children);
$this->__requestXml = $xml->toString(array('header' => true));
$res = $this->_parseResponse(
$this->http->get($this->url, null, array_merge(
$this->__getAuthArray(),
array('body' => $this->__requestXml)
)
));
if ($res === false) {
return false;
}
if ($submethod == 'create') {
$model->id = current(Set::extract('/Response/'.$model->primaryKey, $res));
}
return true;
}
/**
* update
* Alias for create.
*
* @access public
* @param object $model
* @param array $fields
* @param array $values
* @return boolean
*/
public function update(&$model, $fields=null, $values=null) {
return $this->create($model, $fields, $values);
}
/**
* delete
*
* @access public
* @param object $model
* @param integer $id
* @return boolean
*/
public function delete(&$model, $id=null) {
if ($id == null) {
$id = $model->id;
if ($id === false) {
return false;
}
}
$method = (isset($model->method)) ? $model->method : Inflector::underscore($model->alias);
$xml =& new Xml(array('Request' => array('method' => $method.'.delete', $model->primaryKey => array($id))));
$req = $xml->toString(array('header' => true));
$res = $this->_parseResponse(
$this->http->get($this->url, null, array_merge(
$this->__getAuthArray(),
array('body' => $req)
)
));
if ($res === false) {
return false;
}
return true;
}
/**
* _parseResponse
* Either returns response as array or throws error.
*
* @param string $response
* @return array
*/
protected function _parseResponse($response=null) {
if (empty($response)) {
return false;
}
$this->__responseXml = $response;
$xml =& new Xml($response);
$arr = $xml->toArray();
$status = trim(current(Set::extract('/Response/status', $arr)));
if ($status != 'ok') {
$err = current(Set::extract('/Response/error', $arr));
if (empty($err)) {
$err = 'An unknown error occurred.';
}
throw new Exception(__d('freshbooks', $err, true));
return false;
}
return $arr;
}
/**
* _formatResponse
* All keys in array lowercase and
* blank arrays become ''
*
* @param array $data
* @param integer $skip
* @return array
*/
protected function _formatResponse(&$data=null, $skip=2) {
if ($skip == 0) {
$data = array_change_key_case($data, CASE_LOWER);
} else {
$skip--;
}
foreach ($data as $key => $val) {
if (is_array($val)) {
if (sizeof($val) == 0) {
$data[$key] = '';
} else {
$this->_formatResponse($data[$key], $skip);
}
}
}
}
/**
* listSources
* @return boolean
*/
public function listSources() {
return false;
}
/**
* describe
*
* @param object $model
* @return array
*/
public function describe(&$model) {
if (isset($model->schema)) {
return $model->schema;
} else {
return array('id' => array());
}
}
/**
* calculate
* Just return $func to give read() the field 'count'
*
* @param Model $model
* @param mixed $func
* @param array $params
* @return array
* @access public
*/
public function calculate(&$model, $func, $params=array()) {
return $func;
}
/**
* __getAuthArray
* @return array
*/
private function __getAuthArray() {
return array(
'auth' => array(
'method' => 'Basic',
'user' => $this->config['token'],
'pass' => 'X',
),
);
}
}
有人可以告诉我这有什么问题吗？
您是否尝试过阅读错误消息？这是非常明显的：
调用未定义的方法 Xml::toString()
核心 XML 类没有
toString()